Hello Guys, In this blog we are going to interface 1.14 inch LCD with Raspberry Pi Pico RP2040 board. This LCD comes with inbuilt st7789 SPI driver, resolution of 240 x 135 pixels, 65K RGB colors with clear colorful IPS display where you can put your own creativity.
In this tutorial, I am going to fetch data from raspberry pi pico internal temperature sensor, then i will display fetched value to 1.14 inch lcd display.
Pinout
Connect 1.14 inch lcd with raspberry pi pico as shown in below pinout.
| 1.14 inch LCD | Pico Pins | Description |
|---|---|---|
| GND | GND | Ground Supply of pico |
| VCC | 3V3 / VBUS | Power Supply 3.3V - 5V DC (depending on module type) |
| DIN | GP11 | Serial Data Input / Output |
| CLK | GP10 | Serial Clock |
| CS | GP9 | Chip select input pin ("Low" enable) |
| DC | GP8 |
Display data / Command selection pin DC='1': Display data. DC='0': Command data |
| RST | GP12 | Reset Pin. Initialize the chip with a low input |
| BL | GP13 | Backlight Control. High: backlight on Low: backlight off. |
Installation Guide
- Make sure you have connected your 1.14" lcd as same as shown above pinout.
- Now press and hold BOOTSEL button on Pico and connect USB with your system (pc/laptop/Raspberry Pi). it will create a drive as RPI-RP2.
- Now download firmware.uf2 file from below link and drag and drop this file to that RPI-RP2 drive. It will reboot your pico.
- Now Open thonny ide, and select interpreter as "Micropython(Raspberry Pi Pico)".
- Create a new file, then paste below code and save it on pico or on your computer drive with .py extension. (for eg: ReadTemp.py).
- This code is using MicroPython libraries and hardware peripherals to display temperature readings on an LCD screen, and also print them to the console. The code is using an ADC (Analog to Digital Converter) on pin 4 to read the voltage from a temperature sensor, which is then converted to a temperature value using a conversion factor and a formula for the relationship between the sensor's output voltage and temperature. The code also uses the "st7789" library to control an ST7789 LCD screen, and the "utime" library to control the timing of the temperature readings.
- The code first configures the SPI interface, with a high baudrate of 40000000, and the pins for clock, MOSI, reset, chip select, data/command, and backlight. Then it creates an ST7789 object and initializes the LCD.
- Then it fills the top, middle, and bottom of the screen with red, yellow, and cyan color respectively.
- In the infinite while loop, the code reads the sensor value, converts it to a temperature value and prints it on the LCD screen and console. Then it sleeps for 1 second before taking the next reading.
- Finally click on green play button of thonny ide to start the program. It will print the internal temperature sensor value over thonny shel as well as on LCD with colorful blocks.
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