Template:LCD1602 RGB Module Guides for Pico

Hardware Configuration

LCD PIN	Pico
VCC	3.3V
GND	GND
SDA	GP4
SCL	GP5

Setup environment

Please refer to Raspberry Pi's guide: https://www.raspberrypi.org/documentation/pico/getting-started/

Raspberry Pi

• Open a terminal of Raspberry Pi
  
• Download and unzip the demo codes to directory Pico C/C++ SDK
  

#Note that the directory of SDK may be different for different users, you need to check the actual directory. Generally, it should be ~/pico/.
wget  -P ~/pico https://www.waveshare.com/w/upload/5/5b/LCD1602-RGB-Module-demo.zip
cd ~/pico
unzip LCD1602-RGB-Module-demo.zip

C

• Hold the BOOTSEL button of Pico, and connect the USB interface of Pico to Raspberry Pi then release the button.
  
• Compile and run the LCD1602-RGB-Module-demo examples

cd ~/pico/LCD1602-RGB-Module-demo/Pico/c/build/
cmake ..
make
sudo mount /dev/sda1 /mnt/pico && sudo cp LCD1602_RGB_Module_demo.uf2 /mnt/pico/ && sudo sync && sudo umount /mnt/pico && sleep 2

python

• Refer to Raspberry Pi's guides to setup Micropython firmware for Pico
  
• Open the Thonny IDE, and drag the demo to IDE and run on Pico as below. And save RGB1602.py to Pico's file system
  

Windows

C

• Download and unzip the demo to your Windows desktop, refer to Raspberry Pi's guides to set up the Windows software environment settings.
• Find the LCD1602-RGB-Module-demo.uf2 file under the build file under the demo directory, press and hold the BOOTSEL button of Pico, connect the USB of Pico to the PC with a MicroUSB cable, and drag the uf2 file into Pico, and then the Pico will run the demo directly.
• 【Note】 If some users want to modify the demo, after debugging, you can use the following method to generate a .uf2 file:
  • 1. Copy LCD1602-RGB-Module-demo folder to your pico-examples file directory, and then modify the CMakelists.txt configuration file in the pico-example directory as shown in the figure below.
    
  • 2. Open Visual Studio Code, open your pico-examples folder, select LCD1602_RGB_Module_demo, click Generate, you can find the LCD1602_RGB_Module_demo.uf2 file in the build folder.
    
  • 3. Arag the uf2 file into Pico, and then the Pico will run the demo directly.

python

• Download and unzip the demo to your Windows desktop, refer to Raspberry Pi's guides to set up the Windows software environment settings.
• Open the demo program in Thonnty, as shown in the figure below:

• Here you also need to save RGB1602.py to PICO, select RGB1602.py, save it as Raspberry pi pico, and name it RGB1602.py.

• And then run the demo under Choose_Color.py or Discoloration.py.
• Code analysis

Choose_Color.py

#define color
rgb9 = (0,255,0) #cyan’
lcd.setCursor(0, 0) #Set the cursor position
# print the number of seconds since reset:
lcd.printout("Waveshare") #write characters
lcd.setCursor(0, 1) #Set the cursor position to the second row and the zeroth column
lcd.printout("Hello, World!")#write characters
lcd.setRGB(rgb1[0],rgb1[1],rgb1[2]); #Set the backlight

Discoloration.py

t=0
while True:
 
    r = int((abs(math.sin(3.14*t/180)))*255); #RGB changes over time
    g = int((abs(math.sin(3.14*(t+60)/180)))*255);
    b = int((abs(math.sin(3.14*(t+120)/180)))*255);
    t = t + 3;
    lcd.setRGB(r,g,b);#Reset the value of RGB
# set the cursor to column 0, line 1
    lcd.setCursor(0, 0) #Locate to the first row and the zeroth column
# print the number of seconds since reset:
    lcd.printout("Waveshare")#write characters
    lcd.setCursor(0, 1) #Locate to the second row and the zeroth column
    lcd.printout("Hello, World!")#write characters
    time.sleep(0.3)