1.32inch OLED Module

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1.32inch OLED Module
1.32inch OLED Module.jpg

1200 x 825, HDMI
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Overview

Parameters

  • Operating voltage: 3.3V/5V (IO high-level voltage and supply voltage need to be the same)
  • Communication bus: 4-wire SPI/I2C
  • Screen type: OLED
  • Controller: SSD1327
  • Resolution: 128 × 96 Pixels
  • Outline dimensions: 32.6mm × 28.3mm
  • Display dimensions: 26.86mm × 20.14mm
  • Display color: White
  • Grey scale: 16
  • Operating temperature: -20°C ~ 70°C
  • Storage temperature: -30°C ~ 80°C
  • Viewing angle: > 160°

Function Pins

Pin SPI Mode I2C Mode
VCC 3.3V/5V power supply
GND Ground
DIN SPI data input I2C data input
CLK SPI clock input I2C clock input
CS Chip selection, low active NC
DC data/command, low for commands, high for data NC (address selection)
RES reset, low active

Hardware Configuration

  • OLED module provides two kinds of driver interface: 4-wire SPI and I2C interface, respectively, the back of the module has three optional welding resistors, through the selection of resistors to select the corresponding communication mode or switch the I2C address, as shown in Figure:

1.32inch rgb oled module.jpg

  • The module is shipped in 4-wire SPI communication mode by default, i.e., R1 is soldered with 0R resistor, R2 is not soldered, and R3 is not soldered:
  • Configuration table:
Communication Bus R1 R2 R3
4-wire SPI 0R NC NC(Please make sure NC.)
I2C (0x3C) NC 0R 0R
I2C (0x3D) NC


  • The actual hardware connection is shown below:
    • 4-wire SPI: the default factory setting, BS2 is grounded by default, BS1 is connected to ground via R1, DIN is connected to the host MOSI, and CLK is connected to the host SCLK.
    • I2C: BS2 connects to Ground by default, BS1 connected to VCC via pull-up resistor, DIN connected to host SDA, and CLK connected to host SCL;
    • Note: The high and low status of the I2C mode DC can switch the device address, if it is low (solder R3), then the 7-bit address of I2C is 0x3C, and if it is high (no solder R3), it is 0x3D.Do not connect the power supply to the DC pin after R3 welding 0R resistor.
  • Note: The program default SPI mode, need to switch mode please modify DEV_Config.h See program description - underlying hardware interface - interface selection.
  • Note: When using STM32, the I2C routines use analog I2C, please note the connection.

Working with Raspberry Pi

Hardware Connection

When connecting to the Raspberry Pi, you can choose 7PIN to connect and refer to the following table:

Raspberry Pi Pin Correspondence
OLED Raspberry Pi
BCM2835 Board Pin NO.
VCC 3.3V 3.3V
GND GND GND
DIN MOSI / SDA 19 / 3
CLK SCLK / SCL 23 / 5
CS CE0 24
DC 25 22
RES 27 13

1.32inch OLED Module RPI01.jpg

Enable SPI and I2C interfaces

  • Open the terminal, and use the command to enter the configuration page.
sudo raspi-config
Choose Interfacing Options -> SPI -> Yes  to enable the SPI interface

RPI open spi.png
Reboot Raspberry Pi:

sudo reboot

I2C is the same, enter the configuration interface and select Interfacing Options -> I2C -> Yes to open the IIC interface, and then restart.

Install Libraries

  • Install BCM2835 libraries
#Open the Raspberry Pi terminal and run the following command
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
tar zxvf bcm2835-1.71.tar.gz 
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
# For more, you can refer to the official website at http://www.airspayce.com/mikem/bcm2835/
  • Install wiringPi libraries
#Open the Raspberry Pi terminal and run the following command:
cd
sudo apt-get install wiringpi
#For Raspberry Pi systems after May 2019 (earlier than that may be implemented without), an upgrade may be required to:
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
# Run gpio -v and version 2.52 will appear, if it does not appear, it means there is an installation error.

#The Bullseye branch system uses the following command:
git clone https://github.com/WiringPi/WiringPi
cd WiringPi
./build
gpio -v
# Run gpio -v and version 2.70 will appear, if it does not appear it means there is an installation error.
  • Install Python libraries
#python2
sudo apt-get update
sudo apt-get install python-pip
sudo apt-get install python-pil
sudo apt-get install python-numpy
sudo pip install RPi.GPIO
sudo pip install spidev
sudo apt-get install python-smbus
#python3
sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install RPi.GPIO
sudo pip3 install spidev
sudo apt-get install python3-smbus

Download Examples

Open the Raspberry Pi terminal and run the following command

sudo apt-get install p7zip-full
sudo wget  https://files.waveshare.com/upload/2/2c/OLED_Module_Code.7z
7z x OLED_Module_Code.7z -O./OLED_Module_Code
cd OLED_Module_Code/RaspberryPi



Run the demo codes

Please go into the RaspberryPi directory (demo codes) first and run the commands in terminal

C Codes

  • Re-compile the demo codes
cd c
sudo make clean
sudo make -j 8

Test procedures for all screens can be called directly by entering the corresponding size::

sudo ./main screen size

The command of each LCD model can check in the following table:

#0.91inch OLED Module  
sudo ./main 0.91
------------------------------
#0.95inch RGB OLED (A)/(B)
sudo ./main 0.95rgb
------------------------------
#0.96inch OLED (A)/(B)
sudo ./main 0.96
------------------------------
#0.96inch OLED Module (C)/(D)/(E)
sudo ./main 0.96
------------------------------
#1.27inch RGB OLED Module
sudo ./main 1.27rgb
------------------------------
#1.3inch OLED (A)/(B)
sudo ./main 1.3
------------------------------
#1.3inch OLED Module (C)
sudo ./main 1.3c
------------------------------
#1.32inch OLED Module
sudo ./main 1.32
------------------------------
#1.5inch OLED Module
sudo ./main 1.5
------------------------------
#1.5inch RGB OLED Module
sudo ./main 1.5rgb
------------------------------
#1.51inch OLED Module
sudo ./main 1.51

Python

  • Enter Python demo directory:
cd python/example
  • Run the demo for the corresponding OLED model, the demo supports python2/3.

If you purchased a 1.3inch OLED Module (C), please enter:

# python2
sudo python OLED_1in3_c_test.py
# python3
sudo python3 OLED_1in3_c_test.py

If you have purchased a 1.5inch RGB OLED Module, please enter:

# python2
sudo python OLED_1in5_rgb_test.py
# python3
sudo python3 OLED_1in5_rgb_test.py
  • Model instruction correspondence table:
#0.91inch OLED Module 
sudo python OLED_0in91_test.py 
------------------------------------
#0.95inch RGB OLED (A)/(B)
sudo python OLED_0in95_rgb_test.py 
------------------------------------
#0.96inch OLED (A)/(B)
sudo python OLED_0in96_test.py 
------------------------------------
#0.96inch OLED Module (C)/(D)/(E)
sudo python OLED_0in96_test.py 
------------------------------------
#1.27inch RGB OLED Module
sudo python OLED_1in27_rgb_test.py
------------------------------------
#1.3inch OLED (A)/(B)
sudo python OLED_1in3_test.py 
------------------------------------
#1.3inch OLED Module (C)
sudo python OLED_1in3_c_test.py 
------------------------------------
#1.32inch OLED Module
sudo python OLED_1in32_test.py 
------------------------------------
#1.5inch OLED Module
sudo python OLED_1in5_test.py 
------------------------------------
#1.5inch RGB OLED Module
sudo python OLED_1in5_rgb_test.py
------------------------------------
#1.51inch OLED Module
sudo python OLED_1in51_test.py


Description of C codes (API)

Hardware interface

C language uses 3 ways to drive: BCM2835 library, WiringPi library, and Dev library respectively.
The Dev library is used by default for operation. If you need to use BCM2835 or WiringPi to drive, you can open the RaspberryPi\c\Makefile and modify lines 13-15 as follows:

RPI open spi1.png
We have performed the underlying packaging, but the internal implementation is different due to the different hardware platforms, if you need to understand the internal implementation you can go to the corresponding directory to see In DEV_Config.c(.h) you can see many definitions in the directory: RaspberryPi\c\lib\Config.

  • Interface selection:
#define USE_SPI_4W  1
#define USE_IIC     0
Note: Modified here directly to switch SPI/I2C.
  • Data type
#define UBYTE      uint8_t
#define UWORD      uint16_t
#define UDOUBLE    uint32_t
  • Module initialization and exit processing.
void DEV_Module_Init(void);
void DEV_Module_Exit(void);
Note: 
  Here is some GPIO processing before and after using the LCD screen.
  • Write GPIO:
void DEV_Digital_Write(UWORD Pin, UBYTE Value)
Parameter: 
     UWORD Pin: GPIO Pin number
     UBYTE Value: level to be output, 0 or 1
  • Read GPIO:
UBYTE DEV_Digital_Read(UWORD Pin)
Parameter:
     UWORD Pin: GPIO Pin number
     Return value: level of GPIO, 0 or 1
  • GPIO mode setting.
void DEV_GPIO_Mode(UWORD Pin, UWORD Mode)
Parameters: 
     UWORD Pin: GPIO Pin number
     UWORD Mode: Mode, 0: input, 1: output

GUI functions

If you need to draw pictures, display Chinese and English characters, display pictures, etc., we provide some basic functions here about some graphics processing in the directory RaspberryPi\c\lib\GUI\GUI_Paint.c(.h).
LCD rpi GUI.png
The fonts can be found in RaspberryPi\c\lib\Fonts directory.
RPI open spi3.png

  • New Image Properties: Create a new image buffer, this property includes the image buffer name, width, height, flip Angle, color.
void Paint_NewImage(UBYTE *image, UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
      Image: the name of the image buffer, which is actually a pointer to the first address of the image buffer;
      Width: image buffer Width;
      Height: the Height of the image buffer;
      Rotate: Indicates the rotation Angle of an image
      Color: the initial Color of the image;
  • Select image buffer: The purpose of the selection is that you can create multiple image attributes, there can be multiple images buffer, you can select each image you create.
void Paint_SelectImage(UBYTE *image)
Parameters:
       Image: the name of the image buffer, which is actually a pointer to the first address of the image buffer;
  • Image Rotation: Set the rotation Angle of the selected image, preferably after Paint_SelectImage(), you can choose to rotate 0, 90, 180, 270.
void Paint_SetRotate(UWORD Rotate)
Parameters:
        Rotate: ROTATE_0, ROTATE_90, ROTATE_180, and ROTATE_270 correspond to 0, 90, 180, and 270 degrees.
  • Sets the size of the pixels.
void Paint_SetScale(UBYTE scale)
Parameters:
	scale: the size of pixels, 2: each pixel occupies one bit; 4: Each pixel occupies two bits.
  • Image mirror flip: Set the mirror flip of the selected image. You can choose no mirror, horizontal mirror, vertical mirror, or image center mirror.
void Paint_SetMirroring(UBYTE mirror)
Parameters:
        Mirror: indicates the image mirroring mode. MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN correspond to no mirror, horizontal mirror, vertical mirror, and image center mirror respectively.
  • Set points of the display position and color in the buffer: here is the core GUI function, processing points display position and color in the buffer.
void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
        Xpoint: the X position of a point in the image buffer
        Ypoint: Y position of a point in the image buffer
        Color: indicates the Color of the dot
  • Image buffer fill color: Fills the image buffer with a color, usually used to flash the screen into blank.
void Paint_Clear(UWORD Color)
Parameters:
        Color: fill Color
  • The fill color of a certain window in the image buffer: the image buffer part of the window filled with a certain color, usually used to fresh the screen into blank, often used for time display, fresh the last second of the screen.
void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
        Xstart: the x-starting coordinate of the window
        Ystart: the y-starting coordinate of the window
        Xend: the x-end coordinate of the window
        Yend: the y-end coordinate of the window
        Color: fill Color
  • Draw point: In the image buffer, draw points on (Xpoint, Ypoint), you can choose the color, the size of the point, the style of the point.
void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
        Xpoint: indicates the X coordinate of a point.
        Ypoint: indicates the Y coordinate of a point.
        Color: fill Color
        Dot_Pixel: The size of the dot, the demo provides 8 size pointss by default.
              typedef enum {
                 DOT_PIXEL_1X1  ,	        // 1 x 1
                 DOT_PIXEL_2X2  , 		// 2 X 2
                 DOT_PIXEL_3X3  , 	 	// 3 X 3
                 DOT_PIXEL_4X4  , 	 	// 4 X 4
                 DOT_PIXEL_5X5  , 		// 5 X 5
                 DOT_PIXEL_6X6  , 		// 6 X 6
                 DOT_PIXEL_7X7  , 		// 7 X 7
                 DOT_PIXEL_8X8  , 		// 8 X 8
               } DOT_PIXEL;
        Dot_Style: the size of a point that expands from the center of the point or from the bottom left corner of the point to the right and up.
                 typedef enum {
                     DOT_FILL_AROUND  = 1,
                     DOT_FILL_RIGHTUP,
                  } DOT_STYLE;
  • Draw line: In the image buffer, draw line from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width and the style of the line.
void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style ,  LINE_STYLE Line_Style)
Parameters:
        Xstart: the x-starting coordinate of a line
        Ystart: the y-starting coordinate of the a line
        Xend: the x-end coordinate of a line
        Yend: the y-end coordinate of a line
        Color: fill Color
        Line_width: The width of the line, the demo provides 8 sizes of width by default.
              typedef enum {
                 DOT_PIXEL_1X1  ,	        // 1 x 1
                 DOT_PIXEL_2X2  , 		// 2 X 2
                 DOT_PIXEL_3X3  ,		// 3 X 3
                 DOT_PIXEL_4X4  ,		// 4 X 4
                 DOT_PIXEL_5X5  , 		// 5 X 5
                 DOT_PIXEL_6X6  , 		// 6 X 6
                 DOT_PIXEL_7X7  , 		// 7 X 7
                 DOT_PIXEL_8X8  , 		// 8 X 8
              } DOT_PIXEL;
        Line_Style: line style. Select whether the lines are joined in a straight or dashed way.
              typedef enum {
                 LINE_STYLE_SOLID = 0,
                 LINE_STYLE_DOTTED,
              } LINE_STYLE;
  • Draw rectangle: In the image buffer, draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width of the line, whether to fill the inside of the rectangle.
void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
	Xstart: the starting X coordinate of the rectangle
	Ystart: the starting Y coordinate of the rectangle
	Xend: the x-end coordinate of the rectangle
        Yend: the y-end coordinate of the rectangle
	Color: fill Color
	Line_width: The width of the four sides of a rectangle. And the demo provides 8 sizes of width by default.
		typedef enum {
			DOT_PIXEL_1X1  ,	        // 1 x 1
			DOT_PIXEL_2X2  , 		// 2 X 2
			DOT_PIXEL_3X3  ,		// 3 X 3
			DOT_PIXEL_4X4  ,	        // 4 X 4
			DOT_PIXEL_5X5  , 		// 5 X 5
 			DOT_PIXEL_6X6  , 		// 6 X 6
                        DOT_PIXEL_7X7  , 		// 7 X 7
                        DOT_PIXEL_8X8  , 		// 8 X 8
                 } DOT_PIXEL;
         Draw_Fill: Fill, whether to fill the inside of the rectangle
              typedef enum {
                 	DRAW_FILL_EMPTY = 0,
                 	DRAW_FILL_FULL,
              } DRAW_FILL;
  • Draw circle: In the image buffer, draw a circle of Radius with (X_Center Y_Center) as the center. You can choose the color, the width of the line, and whether to fill the inside of the circle.
void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
	X_Center: the x-coordinate of the center of the circle
	Y_Center: the y-coordinate of the center of the circle
	Radius: indicates the Radius of a circle
	Color: fill Color
	Line_width: The width of the arc, with a default of 8 widths
		typedef enum {
        		DOT_PIXEL_1X1  ,	        // 1 x 1
        		DOT_PIXEL_2X2  , 		// 2 X 2
        		DOT_PIXEL_3X3  ,		// 3 X 3
        		DOT_PIXEL_4X4  ,		// 4 X 4
        		DOT_PIXEL_5X5  , 		// 5 X 5
        		DOT_PIXEL_6X6  , 		// 6 X 6
        		DOT_PIXEL_7X7  , 		// 7 X 7
        		DOT_PIXEL_8X8  , 		// 8 X 8
		} DOT_PIXEL;
	Draw_Fill: fill, whether to fill the inside of the circle
              typedef enum {
              		DRAW_FILL_EMPTY = 0,
                 	DRAW_FILL_FULL,
              } DRAW_FILL;
  • Write Ascii character: In the image buffer, use (Xstart Ystart) as the left vertex, write an Ascii character, you can select Ascii visual character library, font foreground color, font background color.
void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
	Xstart: the x-coordinate of the left vertex of a character
	Ystart: the Y-coordinate of the left vertex of a character
	Ascii_Char: indicates the Ascii character
	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
  		Font8: 5*8 font
    		Font12: 7*12 font
    		Font16: 11*16 font
    		Font20: 14*20 font
    		Font24: 17*24 font
  	Color_Foreground: Font color
  	Color_Background: indicates the background color
  • Write English string: In the image buffer, use (Xstart Ystart) as the left vertex, write a string of English characters, you can choose Ascii visual character library, font foreground color, font background color.
void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
	Xstart: the x-coordinate of the left vertex of a character
	Ystart: the Y coordinate of the font's left vertex
	PString: string, string is a pointer
	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
     		Font8: 5*8 font
     		Font12: 7*12 font
     		Font16: 11*16 font
     		Font20: 14*20 font
     		Font24: 17*24 font
	Color_Foreground: Font color
  	Color_Background: indicates the background color
  • Write Chinese string: in the image buffer, use (Xstart Ystart) as the left vertex, write a string of Chinese characters, you can choose character font, font foreground color, font background color of the GB2312 encoding
void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
	Xstart: the x-coordinate of the left vertex of a character
	Ystart: the Y coordinate of the font's left vertex
	PString: string, string is a pointer
  	Font: GB2312 encoding character Font library, in the Fonts folder the demo provides the following Fonts:
     		Font12CN: ASCII font 11*21, Chinese font 16*21
     		Font24CN: ASCII font24 *41, Chinese font 32*41
	Color_Foreground: Font color
	Color_Background: indicates the background color
  • Write numbers: In the image buffer,use (Xstart Ystart) as the left vertex, write a string of numbers, you can choose Ascii visual character library, font foreground color, font background color.
void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, double Nummber, sFONT* Font, UWORD Digit, UWORD Color_Foreground,   UWORD Color_Background)
Parameters:
	Xpoint: the x-coordinate of the left vertex of a character
	Ypoint: the Y coordinate of the left vertex of the font
	Nummber: indicates the number displayed, which can be a decimal
	Digit: It's a decimal number
 	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
   		Font8: 5*8 font
   		Font12: 7*12 font
   		Font16: 11*16 font
		Font20: 14*20 font
   		Font24: 17*24 font
	Color_Foreground: Font color
	Color_Background: indicates the background color
  • Display time: in the image buffer,use (Xstart Ystart) as the left vertex, display time,you can choose Ascii visual character font, font foreground color, font background color.;
void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background,  UWORD Color_Foreground)
Parameters:
	Xstart: the x-coordinate of the left vertex of a character
 	Ystart: the Y coordinate of the font's left vertex
	PTime: display time, A time structure is defined here, as long as the hours, minutes and seconds are passed to the parameters;
	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
     		Font8: 5*8 font
     		Font12: 7*12 font
     		Font16: 11*16 font
     		Font20: 14*20 font
     		Font24: 17*24 font
  	Color_Foreground: Font color
  	Color_Background: indicates the background color

Python(for Raspberry Pi)

It is compatible with python and python3.
The calls of the python are less complex compared to C demo.

config.py

  • Select interface.
Device_SPI = 1
Device_I2C = 0
Note: Switch SPI/I2C modified here
  • Module initialization and exit processing.
def module_init()
def module_exit()
Note:
1. Here is some GPIO processing before and after using the LCD screen.
2. The module_init() function is automatically called in the INIT () initializer on the LCD, but the module_exit() function needs to be called by itself
  • SPI write data.
def spi_writebyte(data)
  • IIC write data.
i2c_writebyte(reg, value):

main.py

The main function, if your Python version is Python2, is re-executed in Linux command mode as follows.

sudo python main.py

If your Python version is Python3, run the following command in Linux.

sudo python3 main.py

GUI functions

Python has an image library PIL official library link, it do not need to write code from the logical layer like C, can directly call to the image library for image processing. The following will take 1.54inch LCD as an example, we provide a brief description for the demo.

  • It needs to use the image library and install the library.
sudo apt-get install python3-pil  

And then import the library

from PIL import Image,ImageDraw,ImageFont.

Among them, Image is the basic library, ImageDraw is the drawing function, and ImageFont is the text function.

  • Define an image buffer
image1 = Image.new("1", (disp.width, disp.height), "WHITE")

The first parameter defines the color depth of the image, which is defined as "1" to indicate the bitmap of one-bit depth. The second parameter is a tuple that defines the width and height of the image. The third parameter defines the default color of the buffer, which is defined as "WHITE".

  • Create a drawing object based on Image1 on which all drawing operations will be performed on here.
draw = ImageDraw.Draw(image1)
  • Draw line.
draw.line([(0,0),(127,0)], fill = 0)

The first parameter is a four-element tuple starting at (0, 0) and ending at (127,0). Draw a line. Fill ="0" means the color of the line is white.

  • Draw rectangle.
draw.rectangle([(20,10),(70,60)],fill = "WHITE",outline="BLACK")

The first argument is a tuple of four elements. (20,10) is the coordinate value in the upper left corner of the rectangle, and (70,60) is the coordinate value in the lower right corner of the rectangle. Fill =" WHITE" means BLACK inside, and outline="BLACK" means the color of the outline is black.

  • Draw circle.
draw.arc((150,15,190,55),0, 360, fill =(0,255,0)

Draw an inscribed circle in the square, the first parameter is a tuple of 4 elements, with (150, 15) as the upper left corner vertex of the square, (190, 55) as the lower right corner vertex of the square, specifying the level median line of the rectangular frame is the angle of 0 degrees, the second parameter indicates the starting angle, the third parameter indicates the ending angle, and fill = 0 indicates that the the color of the line is white. If the figure is not square according to the coordination, you will get an ellipse.

Besides the arc function, you can also use the chord function for drawing solid circle.

draw.ellipse((150,65,190,105), fill = 0)

The first parameter is the coordination of the enclosing rectangle. The second and third parameters are the beginning and end degrees of the circle. The fourth parameter is the fill color of the circle.

  • Character.

The ImageFont module needs to be imported and instantiated:

Font1 = ImageFont.truetype("../Font/Font01.ttf",25)
Font2 = ImageFont.truetype("../Font/Font01.ttf",35)
Font3 = ImageFont.truetype("../Font/Font02.ttf",32)

You can use the fonts of Windows or other fonts which is in ttc format..
Note: Each character library contains different characters; If some characters cannot be displayed, it is recommended that you can refer to the encoding set ro used. To draw English character, you can directly use the fonts; for Chinese character, you need to add a symbol u:

draw.text((5, 68), 'Hello world', fill = 0, font=Font1)
text= u"微雪电子"
draw.text((5, 200), text, fill = 0, font=Font3)

The first parameter is a two-element tuple with (5,68) as the left vertex, and use font1, fill is font color, fill = 0 means that the font color is white, and the second sentence shows’微雪电子’, font color is white.

  • Read local picture.
image = Image.open('../pic/pic.bmp')

The parameter is the image path.

  • Other functions.

Python's image library is very powerful, if you need to implement more, you can learn on the website http://effbot.org/imagingbook pil.

Working with STM32

Hardware Connection

The demo we provide is based on STM43F103RBT6, and the connection method corresponds to the pins of STM32F103RBT6. If you want to port the program, please refer to the following table.

STM32F103RBT6 Pin Correspondence
OLED STM32
VCC 3.3V
GND GND
DIN SPI:PA7 / I2C:PB9 / I2C_SOFT:PC8
CLK SPI:PA5 / I2C:PB8 / I2C_SOFT:PC6
CS PB6
D/C PA8
RES PA9

Run the demo

  • Download the program, find the STM32 program file directory, use STM32CubeIDE to open the .cproject in the \STM32\STM32F103RBT6\ directory.
  • Then modify the corresponding function comment in the main.c according to the LCD model you are using, and then recompile and download to your board.
OLED STM32 code0.png
  • If you are using a 1.3-inch OLED Module (C), you need to comment out line 105. (Note: there cannot be multiple sentences without comment at the same time; the line number may be changed, please modify it according to the actual situation.)
  • The command of each OLED model can be found in the following table:
Model Demo Function
0.49inch OLED Module OLED_0in49_test();
0.91inch OLED Module OLED_0in91_test();
0.95inch RGB OLED (A)/(B) OLED_0in95_rgb_test();
0.96inch OLED (A)/(B) OLED_0in96_test();
0.96inch OLED Module (C)/(D)/(E) OLED_0in96_test();
0.96inch RGB OLED Module OLED_0in96_rgb_test();
1.27inch RGB OLED Module OLED_1in27_rgb_test();
1.3inch OLED (A)/(B) OLED_1in3_test();
1.3inch OLED Module (C) OLED_1in3_c_test();
1.32inch OLED Module OLED_1in32_test();
1.5inch OLED Module OLED_1in5_test();
1.5inch OLED Module(B) OLED_1in5_b_test();
1.5inch RGB OLED Module OLED_1in5_rgb_test();
1.54inch OLED Module OLED_1in54_test();
2.42inch OLED Module OLED_2in42_test();

Software description

  • The demo is developed based on the HAL library, and the software used is STM32CubeIDE. Download the demo, find the STM32 demo file directory, and open the .cproject in the STM32\STM32F103RBT6\ directory to see the demo.
OLED STM32 code71.jpg
  • In addition, you can see the file directory of the project in the STM32\STM32-F103RBT6\User\ directory. The five folders are the underlying driver, sample demo, font, GUI and OLED driver.
OLED STM32 code72.jpg

Demo description

Hardware interface

We package the bottom for different hardware platforms. You can check the DEV_Config.c(.h) file for more description.

  • Interface selection
#define USE_SPI_4W 		 1
#define USE_IIC      	         0
#define USE_IIC_SOFT		 0
Note: Modify here directly to switch SPI/I2C
  • Data type
#define UBYTE      uint8_t
#define UWORD      uint16_t
#define UDOUBLE    uint32_t
  • Module initialization and exit processing:
UBYTE	System_Init(void);
void    System_Exit(void);
Note: 
1. Here are some GPIO processing before and after using the LCD screen.
2. After the System_Exit(void) function is used, the OLED display will be turned off;
  • Write and read GPIO:
void 	DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE 	DEV_Digital_Read(UWORD Pin);
  • SPI writes data:
UBYTE	 SPI4W_Write_Byte(uint8_t value);
  • IIC writes data:
void	 I2C_Write_Byte(uint8_t value, uint8_t Cmd);

Application Function

For the screen, if you need to draw pictures, display Chinese and English characters, display pictures, etc., you can use the upper application to do, and we provide some basic functions here about some graphics processing, you can check in the directory STM32\STM32F103RB\User\GUI\GUI_Paint.c(.h).
OLED STM32 code3.png
The character font GUI dependent is in the directory STM32\STM32F103RB\User\Fonts.
OLED STM32 code4.png

  • Create Image Properties: Create a new image property, this property includes the image buffer name, width, height, flip angle and color.
void Paint_NewImage(UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
    Width: the width of the image buffer;
    Height: the height of the image buffer;
    Rotate: the rotation angle of the image;
    Color: the initial color of the image;
  • Set the clear screen function, usually directly call the OLED clear function:
void Paint_SetClearFuntion(void (*Clear)(UWORD));
parameter:
    Clear: Pointer to the clear screen function, used to quickly clear the screen to a certain color;
  • Set the drawing pixel function:
void Paint_SetDisplayFuntion(void (*Display)(UWORD,UWORD,UWORD));
parameter:
    Display: Pointer to the drawing pixel function, which is used to write data to the specified location in the internal RAM of the OLED;
  • Select image buffer: the purpose of the selection is that you can create multiple image attributes, there can be multiple images buffer, you can select each image you create.
void Paint_SelectImage(UBYTE *image)
Parameters:
    Image: the name of the image buffer, which is actually a pointer to the first address of the image buffer;
  • Image rotation: Set the selected image rotation angle, preferably after Paint_SelectImage(), you can choose to rotate 0, 90, 180 or 270 degrees.
void Paint_SetRotate(UWORD Rotate)
Parameters:
    Rotate: ROTATE_0, ROTATE_90, ROTATE_180 and ROTATE_270 correspond to 0, 90, 180 and 270 degrees respectively;
  • Image mirror flip: Set the mirror flip of the selected image. You can choose no mirror, horizontal mirror, vertical mirror or image center mirror.
void Paint_SetMirroring(UBYTE mirror)
Parameters:
    Mirror: indicates the image mirroring mode. MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN correspond to no mirror, horizontal mirror, vertical mirror and about image center mirror respectively.
  • Set points of display position and color in the buffer: here is the core GUI function, processing points display position and color in the buffer.
void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
    Xpoint: the X position of a point in the image buffer
    Ypoint: the Y position of a point in the image buffer
    Color: the color of the point
  • Image buffer fill color: Fills the image buffer with a color, usually used to flash the screen into blank.
void Paint_Clear(UWORD Color)
Parameters:
    Color: fill color
  • The fill color of a certain window in the image buffer: the image buffer part of the window filled with a certain color, usually used to fresh the screen into blank, often used for time display, fresh the last second of the screen.
void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
    Xstart: the X starting point coordinate of the window
    Ystart: the Y starting point coordinate of the window
    Xend: the x-end coordinate of the window
    Yend: the y-end coordinate of the window
    Color: fill color
  • Draw point: In the image buffer, draw a point on (Xpoint, Ypoint), you can choose the color, the size of the point and the style of the point.
void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
    Xpoint: indicates the X coordinate of a point
    Ypoint: indicates the Y coordinate of a point
    Color: fill color
    Dot_Pixel: The size of the dot, providing a default of eight size points
        typedef enum {
            DOT_PIXEL_1X1  ,		// 1 x 1
            DOT_PIXEL_2X2  , 		// 2 X 2
            DOT_PIXEL_3X3  , 	 	// 3 X 3
            DOT_PIXEL_4X4  , 	 	// 4 X 4
            DOT_PIXEL_5X5  , 		// 5 X 5
            DOT_PIXEL_6X6  , 		// 6 X 6
            DOT_PIXEL_7X7  , 		// 7 X 7
            DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Dot_Style: the style of a point, which determines expands from the center of the point or from the bottom left corner of the point to the right and up
        typedef enum {
            DOT_FILL_AROUND  = 1,
            DOT_FILL_RIGHTUP,
        } DOT_STYLE;
  • Draw line: In the image buffer, draw a line from (Xstart, Ystart) to (Xend, Yend), you can choose the color, line width and line style.
void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style ,  LINE_STYLE Line_Style)
Parameters:
    Xstart: the x-starting coordinate of the line
    Ystart: the y-starting coordinate of the line
    Xend: the x-end coordinate of the line
    Yend: the y-end coordinate of the line
    Color: fill color
    Line_width: The width of the line, the demo provides 8 sizes of width by default.
        typedef enum {
            DOT_PIXEL_1X1  ,		// 1 x 1
            DOT_PIXEL_2X2  , 		// 2 X 2
            DOT_PIXEL_3X3  ,		// 3 X 3
            DOT_PIXEL_4X4  ,		// 4 X 4
            DOT_PIXEL_5X5  , 		// 5 X 5
            DOT_PIXEL_6X6  , 		// 6 X 6
            DOT_PIXEL_7X7  , 		// 7 X 7
            DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Line_Style: line style. Select whether the lines are joined in a straight or dashed way
        typedef enum {
            LINE_STYLE_SOLID = 0,
            LINE_STYLE_DOTTED,
        } LINE_STYLE;
  • Draw rectangle: In the image buffer, draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width of the line and whether to fill the inside of the rectangle.
void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
        Xstart: the starting X coordinate of the rectangle
        Ystart: the starting Y coordinate of the rectangle
        Xend: the x-end coordinate of the rectangle
        Yend: the y-end coordinate of the rectangle
        Color: fill color
        Line_width: The width of the four sides of a rectangle. And the demo provides 8 sizes of width by default.
                DOT_PIXEL_1X1  ,		// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  ,		// 3 X 3
                DOT_PIXEL_4X4  ,		// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
            } DOT_PIXEL;
        Draw_Fill: Fill, whether to fill the inside of the rectangle
            typedef enum {
                DRAW_FILL_EMPTY = 0,
                DRAW_FILL_FULL,
            } DRAW_FILL;
  • Draw circle: In the image buffer, draw a circle with Radius as the radius and (X_Center, Y_Center) as the center. You can choose the color, the width of the line and whether to fill the inside of the circle.
void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
    X_Center: the x-coordinate of the center of a circle
    Y_Center: the y-coordinate of the center of the circle
    Radius: the radius of a circle
    Color: fill color
    Line_width: The width of the arc, with a default of 8 widths
        typedef enum {
            DOT_PIXEL_1X1  ,		// 1 x 1
            DOT_PIXEL_2X2  , 		// 2 X 2
            DOT_PIXEL_3X3  ,		// 3 X 3
            DOT_PIXEL_4X4  ,		// 4 X 4
            DOT_PIXEL_5X5  , 		// 5 X 5
            DOT_PIXEL_6X6  , 		// 6 X 6
            DOT_PIXEL_7X7  , 		// 7 X 7
            DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Draw_Fill: fill, whether to fill the inside of the circle
        typedef enum {
            DRAW_FILL_EMPTY = 0,
            DRAW_FILL_FULL,
        } DRAW_FILL;
  • Write Ascii character: In the image buffer, use (Xstart, Ystart) as the left vertex, and write an Ascii character, you can select Ascii visual character library, font foreground color and font background color.
void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
    Xstart: the x-coordinate of the left vertex of a character
    Ystart: the y-coordinate of the left vertex of a character
    Ascii_Char: indicates the Ascii character
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
    Color_Foreground: font color
    Color_Background: background color
  • Write English string: In the image buffer, use (Xstart, Ystart) as the left vertex, and write a string of English characters, you can choose Ascii visual character library, font foreground color and font background color.
void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    PString: string, string is a pointer
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
     Color_Foreground: font color
     Color_Background: background color
  • Write Chinese string: In the image buffer, use (Xstart Ystart) as the left vertex, and write a string of Chinese characters, you can choose GB2312 encoding character font, font foreground color and font background color.
void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    PString: string, string is a pointer
    Font: GB2312 encoding character Font library, in the Fonts folder provides the following Fonts:
        Font12CN: ASCII font 11*21, Chinese font 16*21
        Font24CN: ASCII font 24*41, Chinese font 32*41
    Color_Foreground: font color
    Color_Background: background color
  • Write numbers: In the image buffer, use (Xstart Ystart) as the left vertex, and write a string of numbers, you can choose Ascii visual character library, font foreground color and font background color.
void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, double Nummber, sFONT* Font, UWORD Digit, UWORD Color_Foreground,   UWORD Color_Background)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    Nummber: indicates the number displayed, which can be a decimal
    Digit: It's a decimal number
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
    Color_Foreground: font color
    Color_Background: background color
  • Display time: in the image buffer, use (Xstart Ystart) as the left vertex, display time, you can choose Ascii visual character font, font foreground color and font background color.
void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background,  UWORD Color_Foreground)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    PTime: display time, here defined a time structure, just pass the hour, minute and second bits of data to the parameter;
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
    Color_Foreground: font color
    Color_Background: background color

Working with Arduino

Hardware Connection

The demo we provide is based on UNO PLUS, and the connection method corresponds to the pins of UNO PLUS. If you want to port the program, you need to connect it according to the actual pins.

Arduino UNO Pin Correspondence
OLED UNO
VCC 3.3V/5V
GND GND
DIN SPI:D11 / I2C:SDA
CLK SPI:D13 / I2C:SCL
CS D10
DC D7
RST D8

Four-wire SPI wire connection diagram:
.32inch OLED Module Arduino 01.jpg

IDE Installation

Run the Demo

  • Download the demo on the #Resource, and open the Arduino demo file directory, you can see the Arduino program for different models of OLED.
OLED Arduino code1.png
  • Choose the folder according to the OLED model you are using, and open the xxx.ino file. Take the 1.3-inch OLED Module (C) as an example: open OLED_1in3_c, then double-click OLED_1in3_c.ino to open the Arduino project.
OLED Arduino code2.png
  • The demo folder of each LCD model can be found in the following table:
Model Demo File Folder
0.49inch OLED Module OLED_0in49
0.91inch OLED Module OLED_0in91
0.95inch RGB OLED (A)/(B) OLED_0in95_rgb
0.96inch OLED (A)/(B) OLED_0in96
0.96inch OLED Module (C)/(D)/(E) OLED_0in96
0.96inch RGB OLED Module OLED_0in96_rgb
1.27inch RGB OLED Module OLED_1in27_rgb
1.3inch OLED (A)/(B) OLED_1in3
1.3inch OLED Module (C) OLED_1in3_c
1.32inch OLED Module OLED_1in32
1.5inch OLED Module OLED_1in5
1.5inch OLED Module(B) OLED_1in5_B
1.5inch RGB OLED Module OLED_1in5_rgb
1.51inch Transparent OLED OLED_1in51
1.54inch OLED Module OLED_1in54
2.42inch OLED Module OLED_2in42

Demo Description

Underlying hardware interface

We package the bottom for different hardware platforms, because the hardware platform and the internal implementation are different. If you need to know the internal implementation, you can see the definitions in the directory DEV_Config.c(.h).

  • Interface selection:
#define USE_SPI_4W 		 1
#define USE_IIC      	         0
Note: Modify here directly to switch SPI/I2C
  • Data type:
#define UBYTE      uint8_t
#define UWORD      uint16_t
#define UDOUBLE    uint32_t
  • Module initialization and exit processing:
UBYTE	System_Init(void);
void    System_Exit(void);
Note: 
1. Here are some GPIO processing before and after using the LCD screen.
2. After the System_Exit(void) function is used, the OLED display will be turned off;
  • Write and read GPIO:
void 	DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE 	DEV_Digital_Read(UWORD Pin);
  • SPI writes data:
UBYTE  SPI4W_Write_Byte(uint8_t value);
  • IIC writes data:
void  I2C_Write_Byte(uint8_t value, uint8_t Cmd);

The Upper Application

For the screen, if you need to draw pictures, display Chinese and English characters, display pictures, etc., you can use the upper application to do so, and we provide some basic functions here about some graphics processing in the directory:
Arduino\OLED_xxx\GUI_Paint.c(.h)

OLED STM32 code4.png
OLED STM32 code3.png

  • Create Image Properties: Create a new set of properties for an image, this property includes the image buffer name, width, height, flip Angle and color.
void Paint_NewImage(UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
    Width: the width of the image buffer;
    Height: the height of the image buffer;
    Rotate: the rotation Angle of the image
    Color: the initial color of the image;
  • Set the clear screen function, usually call the clear function of OLED directly.
void Paint_SetClearFuntion(void (*Clear)(UWORD));
parameter:
    Clear: Pointer to the clear screen function used to quickly clear the screen to a certain color;
  • Set the drawing pixel function.
void Paint_SetDisplayFuntion(void (*Display)(UWORD,UWORD,UWORD));
parameter:
    Display: Pointer to the drawing pixel function, which is used to write data to the specified location in the internal RAM of the OLED;
  • Select image buffer: the purpose of the selection is that you can create multiple image attributes, there can be multiple image buffers, and you can select each image you create.
void Paint_SelectImage(UBYTE *image)
Parameters:
    Image: the name of the image buffer, which is actually a pointer to the first address of the image buffer
  • Image rotation: Set the selected image rotation Angle, preferably after Paint_SelectImage(), you can choose to rotate 0, 90, 180, or 270 degrees.
void Paint_SetRotate(UWORD Rotate)
Parameters:
    Rotate: ROTATE_0, ROTATE_90, ROTATE_180, and ROTATE_270 correspond to 0, 90, 180, and 270 degrees respectively;
  • Image mirror flip: Set the mirror flip of the selected image. You can choose no mirror, horizontal mirror, vertical mirror or image center mirror.
void Paint_SetMirroring(UBYTE mirror)
Parameters:
    Mirror: indicates the image mirroring mode. MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN correspond to no mirror, horizontal mirror, vertical mirror and about image center mirror respectively.
  • Set points of display position and color in the buffer: here is the core GUI function, processing points display position and color in the buffer.
void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
    Xpoint: the X position of a point in the image buffer
    Ypoint: the Y position of a point in the image buffer
    Color: indicates the color of the dot
  • Image buffer fill color: Fills the image buffer with a color, usually used to flash the screen into blank.
void Paint_Clear(UWORD Color)
Parameters:
        Color: fill Color
  • The fill color of a certain window in the image buffer: the image buffer part of the window filled with a certain color, usually used to fresh the screen into blank, often used for time display, fresh the last second of the screen.
void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
    Xstart: the X starting coordinate of the window
    Ystart: the Y starting coordinate of the window
    Xend: the X-end coordinate of the window
    Yend: the Y-end coordinate of the window
    Color: fill color
  • Draw point: In the image buffer, draw a point on (Xpoint, Ypoint), you can choose the color, the size of the point and the style of the point.
void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
    Xpoint: indicates the X coordinate of a point
    Ypoint: indicates the Y coordinate of a point
    Color: fill Color
    Dot_Pixel: The size of the dot, providing a default of eight size points
        typedef enum {
                DOT_PIXEL_1X1  ,		// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  , 	 	// 3 X 3
                DOT_PIXEL_4X4  , 	 	// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Dot_Style: the style of a point that determines expanding from the center of the point or from the bottom left corner of the point to the right and up
        typedef enum {
                DOT_FILL_AROUND  = 1,
                DOT_FILL_RIGHTUP,
        } DOT_STYLE;
  • Draw Line: In the image buffer, draw a line from (Xstart, Ystart) to (Xend, Yend), you can choose the color, line width and line style.
void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style, LINE_STYLE Line_Style)
Parameters:
        Xstart: the X starting coordinate of a line
        Ystart: the Y starting coordinate of a line
        Xend: the x-end coordinate of a line
        Yend: the y-end coordinate of a line
        Color: fill color
        Line_width: The width of the line, which provides a default of eight widths
                typedef enum {
                        DOT_PIXEL_1X1  ,		// 1 x 1
                        DOT_PIXEL_2X2  , 		// 2 X 2
                        DOT_PIXEL_3X3  ,		// 3 X 3
                        DOT_PIXEL_4X4  ,		// 4 X 4
                        DOT_PIXEL_5X5  , 		// 5 X 5
                        DOT_PIXEL_6X6  , 		// 6 X 6
                        DOT_PIXEL_7X7  , 		// 7 X 7
                        DOT_PIXEL_8X8  , 		// 8 X 8
                    } DOT_PIXEL;
        Line_Style: line style. Select whether the lines are joined in a straight or dashed way
                typedef enum {
                        LINE_STYLE_SOLID = 0,
                        LINE_STYLE_DOTTED,
                } LINE_STYLE;
  • Draw rectangle: In the image buffer, draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width of the line and whether to fill the inside of the rectangle.
void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameters:
        Xstart: the starting X coordinate of the rectangle
        Ystart: the starting Y coordinate of the rectangle
        Xend: the X-end coordinate of the rectangle
        Yend: the Y-end coordinate of the rectangle
        Color: fill color
        Line_width: The width of the four sides of a rectangle. Default eight widths are provided
        typedef enum {
                DOT_PIXEL_1X1  ,		// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  ,		// 3 X 3
                DOT_PIXEL_4X4  ,		// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
        Draw_Fill: Fill, in whether to fill the inside of the rectangle
        typedef enum {
                DRAW_FILL_EMPTY = 0,
                DRAW_FILL_FULL,
        } DRAW_FILL;
  • Draw circle: In the image buffer, draw a circle with Radius as the radius and (X_Center, Y_Center) as the center. You can choose the color, the width of the line and whether to fill the inside of the circle.
void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameters:
        X_Center: the X coordinate of the center of the circle
        Y_Center: the Y coordinate of the center of the circle
        Radius: indicates the radius of a circle
        Color: fill color
        Line_width: The width of the arc, with a default of 8 widths
        typedef enum {
                DOT_PIXEL_1X1  ,		// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  ,		// 3 X 3
                DOT_PIXEL_4X4  ,		// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
        Draw_Fill: fill, whether to fill the inside of the circle
        typedef enum {
                DRAW_FILL_EMPTY = 0,
                DRAW_FILL_FULL,
        } DRAW_FILL;
  • Write Ascii character: In the image buffer, use (Xstart, Ystart) as the left vertex, write an Ascii character, you can select Ascii visual character library, font foreground color and font background color.
void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
        Xstart: the X coordinate of the left vertex of a character
        Ystart: the Y coordinate of the left vertex of a character
        Ascii_Char: indicates the Ascii character
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
                Font24: 17*24 font
        Color_Foreground: font color
        Color_Background: background color
  • Write English string: In the image buffer, use (Xstart, Ystart) as the left vertex, write a string of English characters, can choose Ascii visual character library, font foreground color and font background color.
void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
        Xstart: the X coordinate of the left vertex of a character
        Ystart: the Y coordinate of the left vertex of a character
        PString: string, string is a pointer
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
                Font24: 17*24 font
        Color_Foreground: font color
        Color_Background: background color
  • Write Chinese string: In the image buffer, use (Xstart, Ystart) as the left vertex, and write a string of Chinese characters, you can choose GB2312 encoding character font, font foreground color and font background color.
void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
        Xstart: the X coordinate of the left vertex of a character
        Ystart: the Y coordinate of the left vertex of a character
        PString: string, string is a pointer
        Font: GB2312 encoding character Font library, in the Fonts folder provides the following Fonts:
                Font12CN: ASCII font 11*21, Chinese font 16*21
                Font24CN: ASCII font 24*41, Chinese font 32*41
        Color_Foreground: font color
        Color_Background: background color
  • Write numbers: In the image buffer, use (Xstart, Ystart) as the left vertex, and write a string of numbers, you can choose Ascii visual character library, font foreground color and font background color.
void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, double Nummber, sFONT* Font, UWORD Digit, UWORD Color_Foreground,   UWORD Color_Background)
Parameters:
        Xpoint: the X coordinate of the left vertex of the character
        Ypoint: the Y coordinate of the left vertex of the character
        Nummber: indicates the number displayed, which can be a decimal
        Digit: it's a decimal number
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
               Font24: 17*24 font
        Color_Foreground: font color
        Color_Background: background color
  • Display time: In the image buffer, use (Xstart Ystart) as the left vertex, display time, you can choose Ascii visual character font, font foreground color and font background color.
void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background,  UWORD Color_Foreground)
Parameters:
        Xstart: the X coordinate of the left vertex of a character
        Ystart: the Y coordinate of the left vertex of a character
        PTime: display time, here defined a time structure, just pass the hour, minute and second bits of data to the parameter;
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
                Font24: 17*24 font
        Color_Foreground: font color
        Color_Background: background color

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FAQ

 Answer:

The OLED module is used in a 3.3V system by default, but after our 24+ hour aging test, we found that it works fine in a 5V system.

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 Answer:

Under normal operating conditions, there are typically 50,000 hours.

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 Answer:

At 3.3V operating voltage:

0.95inch RGB OLED: about 38mA for all-white display and 4mA for all-black display.

0.96inch OLED: about 25mA for full on and 1.5mA for full off.

1.3inch OLED: about 29mA for full on and 1.0mA for full off.

1.51inch OLED: about 171mA for full on and 6.9mA for full off.

2.42inch OLED: about 196mA for full on and 7.3mA for full off.

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 Answer:

OLED is no backlight, the display belongs to the self-luminous way. Only connected to VCC and GND, OLED will not light up.

You must use the program control to highlight the OLED.

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 Answer:

1. Be careful not to reverse the power connection.

2. Can not display the same screen for a long time, otherwise, it will produce residual images and lead to OLED damage.

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