Pico e-Paper 2.9

2.9inch EPD Module for Raspberry Pi Pico,
296 × 128, Black / White, SPI

Overview

2.9inch EPD (Electronic Paper Display) Module For Raspberry Pi Pico, 296 × 128 Pixels, Black / White, SPI Interface.

Specification

Dimension: 2.9inch
Outline dimensions (raw panel): 79.0mm × 36.7mm × 1.05mm
Outline dimension (with driver board): 82.0mm × 38.0mm
Display size: 66.89mm × 29.05mm
Operating voltage: 3.3V/5V
Interface: SPI
Dot pitch: 0.227 × 0.226
Resolution: 296 × 128 pixels
Display color: Black, White
Greyscale: 4
Partial refresh time: 0.6s
Full refresh time: 3s
Refresh power: 26.4mW (typ.)
Standby current: <0.01uA (almost none)
Touch points: 5 (MAX)
Touch type: Capacitive
Touch interface: I2C (Address: 0x48)
Touch panel: Toughened glass panel
【Note】
- Refresh time: The refresh time is the experimental results, the actual refresh time will have errors, and the actual effect shall prevail. There will be a flickering effect during the global refresh process, this is a normal phenomenon.
- Power consumption: The power consumption data is the experimental results. The actual power consumption will have a certain error due to the existence of the driver board and the actual use situation. The actual effect shall prevail.

Note: The local brush does not have a four-grayscale display, only the full brush has, refer to Pico-ePaper-2.9.

SPI Communication Timing

Since the ink screen only needs to be displayed, the data cable (MISO) sent from the machine and received by the host is hidden here.

CS: Slave chip select, when CS is low, the chip is enabled.
DC: data/command control pin, write command when DC=0; write data when DC=1.
SCLK: SPI communication clock.
SDIN: SPI communication master sends, the slave receives.
Timing: CPHL=0, CPOL=0 (SPI0).

【Remarks】For specific information about SPI, you can search for information online.

Working Protocol

This product is an E-paper device adopting the image display technology of Microencapsulated Electrophoretic Display, MED. The initial approach is to create tiny spheres, in which the charged color pigments are suspended in the transparent oil and would move depending on the electronic charge. The E-paper screen display patterns by reflecting the ambient light, so it has no background light requirement. (Note that the e-Paper cannot support updating directly under sunlight).

Programming Principle

We define the pixels in a monochrome picture, 0 is black and 1 is white.
- White：□: Bit 1
- Black：■：Bit 0
The dot in the figure is called a pixel. As we know, 1 and 0 are used to define the color, therefore we can use one bit to define the color of one pixel, and 1 byte = 8pixels.
Taking 16 pixels as an example, let's assume the first 8 pixels are black and the last 8 pixels are white. Therefore, the pixels 1-16 correspond to bits 0 to 15, where 0 represents black and 1 represents white.

For computers, the data storage format is such that the higher bits come first, followed by the lower bits, and each byte comprises only 8 bits. Therefore, there's a slight alteration.

So we can use two bytes for 16 pixels.

In addition to bicolor displaying, the 2.9-inch e-paper also supports four grayscale.

First of all, we need to understand the 4-gray-scale picture, which shows that the brightness change between the brightest and the darkest is divided into 4 parts, from white to black, and there are 2 more colors in the middle. We can define it as light gray and dark grey.

Black: 00b
Dark Grey: 10b
Light Grey: 01b
White: 11b

In general, to save storage space, computers typically use two bits to represent one pixel. Using the previous example of 8 pixels, where 2 pixels are black, 2 pixels are dark gray, 2 pixels are light gray, and 2 pixels are white:

Pixel	1		2		3		4		5		6		7		8
Bit	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0
Data	0	0	0	0	1	0	1	0	0	1	0	1	1	1	1	1
Color	Black		Black		Dark Grey		Dark Grey		Light Grey		Light Grey		White		White
Byte	0x0A								0x5F

The display divides a four-grayscale picture into two pictures. The pixels in the same position of pictures are combined into one pixel. There are 4 combinations of this point, that is, 4 gray levels:

Register	White	Light Grey	Dark Grey	Black
0x24	0x01	0x00	0x01	0x00
0x26	0x01	0x01	0x00	0x00

We have already known the relationship between 4 gray scales and memory, and we know that different combinations correspond to different colors on the ink screen, so we need to convert the above data:

Pixel	1		2		3		4		5		6		7		8
Bit	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0
Data	0	0	0	0	1	0	1	0	0	1	0	1	1	1	1	1
Color	Black		Black		Dark Grey		Dark Grey		Light Grey		Light Grey		White		White
Byte	0x0A								0x5F
Bit in 0x24 register	0		0		1		1		0		0		1		1
Bit in 0x26 register	0		0		0		0		1		1		1		1
Data sent to 0x24 register	0x33
Data sent to 0x26 register	0x0F

RPi Pico

Hardware Connection

Please take care of the direction when connecting Pico/Pico2. A logo of the USB port is printed to indicate the directory, you can also check the pins.
If you want to connect the board by an 8-pin cable, you can refer to the table below:

e-Paper	Pico/Pico2	Description
VCC	VSYS	Power input
GND	GND	Ground
DIN	GP11	MOSI pin of SPI interface, data transmitted from the Host to Slave.
CLK	GP10	SCK pin of SPI interface, clock input of the Slave
CS	GP9	Chip select pin of SPI interface, Low Active
DC	GP8	Data/Command control pin (High: Data; Low: Command)
RST	GP12	Reset pin, low active
BUSY	GP13	Busy output pin

You can just attach the board to Pico/Pico2 like the Pico-ePaper-7.5.

Setup Environment

You can refer to the guides for Raspberry Pi: https://www.raspberrypi.org/documentation/pico/getting-started/

Download Demo codes

Open a terminal of Pi and run the following command:

cd ~
sudo wget  https://files.waveshare.com/upload/5/5a/Pico_ePaper_Code.zip
unzip Pico_ePaper_Code.zip -d Pico_ePaper_Code
cd ~/Pico_ePaper_Code

You can also clone the codes from Github.

cd ~
git clone https://github.com/waveshare/Pico_ePaper_Code.git
cd ~/Pico_ePaper_Code

About the examples

The guides are based on Raspberry Pi.

C codes

The example provided is compatible with several types, you need to modify the main.c file, uncomment the definition according to the actual type of display you get.
For example, if you have the Pico-ePaper-2.13, please modify the main.c file, uncomment line 18 (or maybe it is line 19).

Set the project:

cd ~/Pico_ePaper_Code/c

Create build folder and add the SDK. ../../pico-sdk is the default path of the SDK, if you save the SDK to other directories, please change it to the actual path.

mkdir build
cd build
export PICO_SDK_PATH=../../pico-sdk

Run cmake command to generate Makefile file.

#Pico
cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 ..
#Pico2
cmake -DPICO_BOARD=pico2 -DPICO_PLATFORM=rp2350 ..

Run the command make to compile the codes.

make -j9

After compiling, the epd.uf2 file is generated. Next, press and hold the BOOTSEL button on the Pico board, connect the Pico to the Raspberry Pi using the Micro USB cable, and release the button. At this point, the device will recognize a removable disk (RPI-RP2).
Copy the epd.uf2 file just generated to the newly recognized removable disk (RPI-RP2), Pico will automatically restart the running program.

#Pico
cp epd.uf2 /media/pi/RPI-RP2/
#Pico2
cp epd.uf2 /media/pi/RP2350

Python

First press and hold the BOOTSEL button on the Pico board, use the Micro USB cable to connect the Pico to the Raspberry Pi, then release the button. At this point, the device will recognize a removable disk (RPI-RP2).
Copy the uf2 file in the python directory to the removable disk (RPI-RP2) just identified.
- Pico: rp2-pico-20210418-v1.15.uf2
- Pico 2: rp2-pcio2-20240809-v1.24.0.uf2
Update Thonny IDE.

sudo apt upgrade thonny

Open Thonny IDE (click on the Raspberry logo -> Programming -> Thonny Python IDE ), and select the interpreter:
- Select Tools -> Options... -> Interpreter.
- Select MicroPython (Raspberry Pi Pico and ttyACM0 port).
Open the Pico_ePaper-xxx.py file in Thonny IDE, then run the current script (click the green triangle).

C Code Analysis

Bottom Hardware Interface

We package the hardware layer for easily porting to the different hardware platforms.
DEV_Config.c(.h) in the directory: Pico_ePaper_Code\c\lib\Config.

Data type:

#define UBYTE   uint8_t
#define UWORD   uint16_t
#define UDOUBLE uint32_t

Module initialize and exit:

void DEV_Module_Init(void);
void DEV_Module_Exit(void);
Note：
1. The functions above are used to initialize the display or exit handle.

GPIO Write/Read:

void DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE DEV_Digital_Read(UWORD Pin);

SPI transmits data:

void DEV_SPI_WriteByte(UBYTE Value);

EPD driver

The driver codes of EPD are saved in the directory: Pico_ePaper_Code\c\lib\e-Paper
Open the .h header file, you can check all the functions defined.

Initialize e-Paper, this function is always used at the beginning and after waking up the display.

//2.13inch e-Paper, 2.13inch e-Paper V2, 2.13inch e-Paper (D), 2.9inch e-Paper, 2.9inch e-Paper (D)
void EPD_xxx_Init(UBYTE Mode); // Mode = 0 fully update, Mode = 1 partial update
//Other types
void EPD_xxx_Init(void);

xxx should be changed by the type of e-Paper, For example, if you use 2.13inch e-Paper (D), to fully update, it should be EPD_2IN13D_Init(0) and EPD_2IN13D_Init(1) for the partial update;

Clear: this function is used to clear the display to white.

void EPD_xxx_Clear(void);

xxx should be changed by the type of e-Paper, For example, if you use 2.9inch e-Paper (D), it should be EPD_2IN9D_Clear();

Send the image data (one frame) to EPD and display

//Bicolor version
void EPD_xxx_Display(UBYTE *Image);
//Tricolor version
void EPD_xxx_Display(const UBYTE *blackimage, const UBYTE *ryimage);

There are several types which are different from others

//Partial update for 2.13inch e-paper (D), 2.9inch e-paper (D)
void EPD_2IN13D_DisplayPart(UBYTE *Image);
void EPD_2IN9D_DisplayPart(UBYTE *Image);

//For 2.13inch e-paper V2, you need to first useEPD_xxx_DisplayPartBaseImage to display a static background and then partial update by the function EPD_xxx_DisplayPart()
void EPD_2IN13_V2_DisplayPart(UBYTE *Image);
void EPD_2IN13_V2_DisplayPartBaseImage(UBYTE *Image);

Enter sleep mode

void EPD_xxx_Sleep(void);

Note, You should only hardware reset or use initialize function to wake up e-Paper from sleep mode
xxx is the type of e-Paper, for example, if you use 2.13inch e-Paper D, it should be EPD_2IN13D_Sleep().

Application Programming Interface

We provide basic GUI functions for testing, like draw point, line, string, and so on. The GUI function can be found in the directory: RaspberryPi_JetsonNano\c\lib\GUI\GUI_Paint.c(.h).

The fonts used can be found in the directory: RaspberryPi_JetsonNano\c\lib\Fonts.

Create a new image, you can set the image name, width, height, rotate angle, and color.

void Paint_NewImage(UBYTE *image, UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
 	image: Name of the image buffer, this is a pointer;
 	Width: Width of the image;
 	Height: Height of the image;
 	Rotate: Rotate the angle of the Image;
 	Color: The initial color of the image;

Select image buffer: You can create multiple image buffers at the same time and select the certain one and draw by this function.

void Paint_SelectImage(UBYTE *image)
Parameters:
 	image: The name of the image buffer, this is a pointer;

Rotate image: You need to set the rotation angle of the image, this function should be used after Paint_SelectImage(). The angle can be 0, 90, 180, or 270.

void Paint_SetRotate(UWORD Rotate)
Parameters:
 	Rotate: Rotate the angle of the image, the parameter can be ROTATE_0, ROTATE_90, ROTATE_180, ROTATE_270.

【Note】After rotating, the place of the first pixel is different, we take a 1.54-inch e-paper as an example.

Image mirror: This function is used to set the image mirror.

void Paint_SetMirroring(UBYTE mirror)
Parameters:
 	mirror: Mirror type if the image, the parameter can be MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN.

Set the position and color of pixels: This is the basic function of GUI, it is used to set the position and color of a pixel in the buffer.

void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
 	Xpoint: The X-axis value of the point in the image buffer
 	Ypoint: The Y-axis value of the point in the image buffer
 	Color: The color of the point

Clear display: To set the color of the image, this function always be used to clear the display.

void Paint_Clear(UWORD Color)
Parameters:
 	Color: The color of the image

Color of the windows: This function is used to set the color of windows, it is always used for updating partial areas like displaying a clock.

void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
 	Xpoint: The X-axis value of the start point in the image buffer
 	Ypoint: The Y-axis value of the start point in the image buffer
 	Xend: The X-axis value of the end point in the image buffer
 	Yend: The Y-axis value of the end point in the image buffer
 	Color: The color of the windows

Draw point: Draw a point at the position (X point, Y point) of the image buffer, you can configure the color, size, and style.

void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
 	Xpoint: X-axis value of the point.
 	Ypoint: Y-axis value of the point.
 	Color: Color of the point
 	Dot_Pixel: Size of the point, 8 sizes are available.
 	 	 typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 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: Style of the point, define the extended mode of the point.
 	 	typedef enum {
 	 	   DOT_FILL_AROUND  = 1,		
 	 	   DOT_FILL_RIGHTUP,
 	 	} DOT_STYLE;

Draw the line: Draw a line from (Xstart, Ystart) to (Xend, Yend) in the image buffer, you can configure the color, width, and style.

void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style , LINE_STYLE Line_Style)
Parameters:
 	Xstart: Xstart of the line
 	Ystart: Ystart of the line
 	Xend: Xend of the line
 	Yend: Yend of the line
 	Color: Color of the line
 	Line_width: Width of the line, 8 sizes are available.
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 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: Style of the line, Solid or Dotted.
 	 	typedef enum {
 	 	 	 LINE_STYLE_SOLID = 0,
 	 	 	 LINE_STYLE_DOTTED,
 	 	} LINE_STYLE;

Draw a rectangle: Draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can configure the color, width, and style.

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: Xend of the rectangle.
 	Yend: Yend of the rectangle.
 	Color: Color of the rectangle
 	Line_width: The width of the edges. 8 sizes are available.
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 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: Style of the rectangle, empty or filled.
 	 	typedef enum {
 	 	 	 DRAW_FILL_EMPTY = 0,
 	 	 	 DRAW_FILL_FULL,
 	 	} DRAW_FILL;

Draw circle: Draw a circle with the center at (X_Center, Y_Center) and a radius of Radius. You can choose the color, line width, and whether to fill the interior 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: X coordinate of the center of the circle
 	Y_Center: Y coordinate of the center of the circle
 	Radius: Radius of circle
 	Color: Color of the circle
 	Line_width: The width of arc, 8 sizes are available.
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 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: Style of the circle: empty or filled.
 	 	typedef enum {
 	 	 	 DRAW_FILL_EMPTY = 0,
 	 	 	 DRAW_FILL_FULL,
 	 	} DRAW_FILL;

Show Ascii character: Show a character in (Xstart, Ystart) position, you can configure the font, foreground, and background.

void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of the character
 	Ystart: Ystart of the character
 	Ascii_Char: Ascii character
 	Font:  Ascii code, five fonts are available.
 	 	font8: 5*8
 	 	font12: 7*12
 	 	font16: 11*16
 	 	font20: 14*20
 	 	font24: 17*24
 	Color_Foreground: foreground color
 	Color_Background: background color

Draw the string: Draw the string at (Xstart Ystart), you can configure the fonts, foreground, and background.

void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of the string
 	Ystart: Ystart of the string
 	pString: String, just as a pointer
 	Font: Ascii, five fonts are available:
 	 	font8: 5*8
 	 	font12: 7*12
 	 	font16: 11*16
 	 	font20: 14*20
 	 	font24: 17*24
 	Color_Foreground: foreground color
 	Color_Background: background color

Draw Chinese string: Draw the Chinese string at (Xstart Ystart) of the image buffer. You can configure fonts (GB2312), foreground, and background.

void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of string
 	Ystart: Ystart of string
 	pString: string
 	Font: GB2312 fonts, two fonts are available  
 	 	font12CN: ascii 11*21，Chinese 16*21
 	 	font24CN: ascii 24*41，Chinese 32*41
 	Color_Foreground: Foreground color
 	Color_Background: Background color

Draw number: Draw numbers at (Xstart Ystart) of the image buffer. You can select font, foreground, and background.

void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, int32_t Nummber, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of numbers
 	Ystart: Ystart of numbers
 	Nummber: numbers displayed. It supports int type and 2147483647 is the maximum supported number.
 	Font: Ascii fonts, five fonts are available:
 	 	font8: 5*8
 	 	font12: 7*12
 	 	font16: 11*16
 	 	font20: 14*20
 	 	font24: 17*24
 	Color_Foreground: foreground
 	Color_Background: background

Display time: In the image buffer, starting from the point (Xstart, Ystart) as the left-top corner, display a segment of time. You can choose from an ASCII visual character library, font foreground color, and font background color. This is designed for convenient testing of partial refresh. Since the time required for partial refresh is 0.3 seconds, the overall refresh takes less than 1 second, including data transmission, achieving a refresh rate of 1 second.

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-top point of the character
 	Ystart: the Y coordinate of the left-top point of the character
 	pTime: the displayed time, define a structured time format. Simply pass the parameters representing the hour, minute, and second digits.
 	Font: Ascii font, five fonts are available
 	 	font8: 5*8
 	 	font12: 7*12
 	 	font16: 11*16
 	 	font20: 14*20
 	 	font24: 17*24
 	Color_Foreground: foreground
 	Color_Background: background

Resource

Document

Demo codes

Development Software

Pico Quick Start

Firmware Download

MicroPython Firmware Download

C_Blink Firmware Download

Text Tutorial

Introduction

Raspberry Pi Pico

MicroPython Series

C/C++ Series

For C/C++, it is recommended to use Pico VS Code for development. This is a Microsoft Visual Studio Code extension designed to make it easier for you to create, develop, and debug projects for the Raspberry Pi Pico series development board. Whether you are a beginner or an experienced professional, this tool can help you confidently and easily develop Pico. Below we will introduce how to install and use the extension.

Official website tutorial: https://www.raspberrypi.com/news/pico-vscode-extension/.
This tutorial is applicable to Raspberry Pi Pico, Pico2, and our company's RP2040 and RP2350 series development boards.
The development environment defaults to Windows as an example. For other environments, please refer to the official website tutorial for installation.

Arduino IDE Series

Install Arduino IDE

Download the Arduino IDE installation package from Arduino website.
Just click on "JUST DOWNLOAD".
Click to install after downloading.
Note: You will be prompted to install the driver during the installation process, we can click Install.

Install Arduino-Pico Core on Arduino IDE

Open Arduino IDE, click the File on the left corner and choose "Preferences".

Add the following link in "Additional boards manager URLs", then click OK.

https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Note: If you already have the ESP32 board URL, you can separate the URLs with commas like this:

https://dl.espressif.com/dl/package_esp32_index.json,https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Click on Tools -> Board -> Board Manager -> Search for pico, it shows installed since my computer has already installed it.

Upload Demo At the First Time

Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer via the Micro USB cable, and release the button when the computer recognizes a removable hard drive (RPI-RP2).
Download the demo from #Resource, open the D1-LED.ino under arduino\PWM\D1-LED path.
Click Tools -> Port, remember the existing COM, do not need to click this COM (different computers show different COM, remember the existing COM on your computer).
Connect the driver board to the computer with a USB cable, then click Tools -> Ports, select uf2 Board for the first connection, and after the upload is complete, connecting again will result in an additional COM port.
Click Tools -> Board -> Raspberry Pi Pico/RP2040 -> Raspberry Pi Pico.
After setting, click the right arrow to upload.
- If you encounter problems during the period, you need to reinstall or replace the Arduino IDE version, uninstall the Arduino IDE clean, after uninstalling the software you need to manually delete all the contents of the folder C:\Users\[name]\AppData\Local\Arduino15 (you need to show the hidden files in order to see it) and then reinstall.

Open Source Demo

FAQ

Question:What is the usage environment of the e-ink screen?

Answer:

*【Working conditions】Temperature range: 0~50°C; Humidity range: 35%~65%RH.

【Storage conditions】: Temperature range: below 30°C; Humidity range: below 55%RH; Maximum storage time: 6 months.
【Transportation conditions】: Temperature range: -25~70°C; Maximum transportation time: 10 days.
【After unpacking】: Temperature range: 20°C±5°C; Humidity range: 50±5%RH; Maximum storage time: Assemble within 72 hours.

{{{5}}}

Question:Precautions for e-ink screen refresh

Answer:

*refresh mode

- Full refresh: The electronic ink screen will flicker several times during the refresh process (the number of flickers depends on the refresh time), and the flicker is to remove the afterimage to achieve the best display effect

Partial refresh: The electronic ink screen has no flickering effect during the refresh process. Users who use the partial brushing function note that after refreshing several times, a full brush operation should be performed to remove the residual image, otherwise the residual image problem will become more and more serious, or even damage the screen (currently only some black and white e-ink screens support partial brushing, please refer to product page description)

refresh rate
- During use, it is recommended that customers set the refresh interval of the e-ink screen to at least 180 seconds (except for products that support the local brush function)
- During the standby process (that is, after the refresh operation), it is recommended that the customer set the e-ink screen to sleep mode, or power off operation (the power supply part of the ink screen can be disconnected with an analog switch) to reduce power consumption and prolong the life of the e-ink screen. (If some e-ink screens are powered on for a long time, the screen will be damaged beyond repair.)
- During the use of the three-color e-ink screen, it is recommended that customers update the display screen at least once every 24 hours (if the screen remains the same screen for a long time, the screen burn will be difficult to repair)
place of use
- The e-ink screen is recommended for indoor use. If you use it outdoors, you need to avoid direct sunlight on the e-ink screen, and take UV protection measures at the same time. When designing e-ink screen products, customers should pay attention to determine whether the use environment meets the temperature and humidity requirements of the e-ink screen

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