Home Hardware 2 inch LCD option for your Raspberry Pi Pico

2 inch LCD option for your Raspberry Pi Pico

by rp2040guy71

In this article we look at a 2 inch LCD option for your Raspberry Pi Pico, its a 320 x 240 display with 4 buttons

The LCD is designed to have the Raspberry Pi Pico fitted to it, if you were to do this then you would get access to any of the other unused pins. You can used an expansion board which will allow you to fit the LCD but not directly to the Pico.

Later on there is an example which does not require any libraries written in micropython

Here are the features at a glance

  • 320×240 resolution, IPS screen, 65K RGB colors, clear and colorful displaying effect
  • SPI interface requires minimal IO pins
  • 4x user buttons for easy interacting

Specifications

  • Operating voltage: 2.6 to 5.5V
  • Resolution: 320 x 240 pixels
  • Communication interface: 4-wire SPI
  • Display size: 40.80 x 30.60mm
  • Display Panel: IPS
  • Pixel size: 0.1275 x 0.1275mm
  • Driver: ST7789VW

Pinout

Pico-LCD-2-details-inter

Pico-LCD-2-details-inter

 

LCD Pico Description
VCC VSYS Power Input
GND GND GND
DIN GP11 MOSI pin of SPI, data transmitted from Master t Slave
CLK GP10 SCK pin of SPI, clock pin
CS GP9 Chip selection of SPI, low active
DC GP8 Data/Command control pin (High:data; Low: command)
RST GP12 Reset pin, low active
BL GP13 Backlight control
KEY0 GP15 User button KEY0
KEY1 GP17 User button KEY1
KEY2 GP2 User button KEY2
KEY3 GP3 User button KEY3

Purchase

This LCD costs around $15

Amazon – waveshare 2 inch LCD Display for Raspberry Pi Pico, IPS Screen 320×240 Display Color 65K RGB SPI Interface, Compatible with Raspberry Pi Pico Header

Aliexpress – 2inch 320X240 SPI LCD Display Screen Module HAT for RPI Raspberry Pi PICO RP2040 Accessories

Code example

This is the Micropython example from the link underneath

from machine import Pin,SPI,PWM
import framebuf
import time
import os
 
BL = 13
DC = 8
RST = 12
MOSI = 11
SCK = 10
CS = 9
 
 
class LCD_2inch(framebuf.FrameBuffer):
    def __init__(self):
        self.width = 320
        self.height = 240
 
        self.cs = Pin(CS,Pin.OUT)
        self.rst = Pin(RST,Pin.OUT)
 
        self.cs(1)
        self.spi = SPI(1)
        self.spi = SPI(1,1000_000)
        self.spi = SPI(1,100000_000,polarity=0, phase=0,sck=Pin(SCK),mosi=Pin(MOSI),miso=None)
        self.dc = Pin(DC,Pin.OUT)
        self.dc(1)
        self.buffer = bytearray(self.height * self.width * 2)
        super().__init__(self.buffer, self.width, self.height, framebuf.RGB565)
        self.init_display()
 
        self.RED   =   0x07E0
        self.GREEN =   0x001f
        self.BLUE  =   0xf800
        self.WHITE =   0xffff
        self.BLACK =   0x0000
 
    def write_cmd(self, cmd):
        self.cs(1)
        self.dc(0)
        self.cs(0)
        self.spi.write(bytearray([cmd]))
        self.cs(1)
 
    def write_data(self, buf):
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(bytearray([buf]))
        self.cs(1)
 
    def init_display(self):
        """Initialize dispaly"""  
        self.rst(1)
        self.rst(0)
        self.rst(1)
 
        self.write_cmd(0x36)
        self.write_data(0x70)
 
        self.write_cmd(0x3A) 
        self.write_data(0x05)
 
        self.write_cmd(0xB2)
        self.write_data(0x0C)
        self.write_data(0x0C)
        self.write_data(0x00)
        self.write_data(0x33)
        self.write_data(0x33)
 
        self.write_cmd(0xB7)
        self.write_data(0x35) 
 
        self.write_cmd(0xBB)
        self.write_data(0x19)
 
        self.write_cmd(0xC0)
        self.write_data(0x2C)
 
        self.write_cmd(0xC2)
        self.write_data(0x01)
 
        self.write_cmd(0xC3)
        self.write_data(0x12)   
 
        self.write_cmd(0xC4)
        self.write_data(0x20)
 
        self.write_cmd(0xC6)
        self.write_data(0x0F) 
 
        self.write_cmd(0xD0)
        self.write_data(0xA4)
        self.write_data(0xA1)
 
        self.write_cmd(0xE0)
        self.write_data(0xD0)
        self.write_data(0x04)
        self.write_data(0x0D)
        self.write_data(0x11)
        self.write_data(0x13)
        self.write_data(0x2B)
        self.write_data(0x3F)
        self.write_data(0x54)
        self.write_data(0x4C)
        self.write_data(0x18)
        self.write_data(0x0D)
        self.write_data(0x0B)
        self.write_data(0x1F)
        self.write_data(0x23)
 
        self.write_cmd(0xE1)
        self.write_data(0xD0)
        self.write_data(0x04)
        self.write_data(0x0C)
        self.write_data(0x11)
        self.write_data(0x13)
        self.write_data(0x2C)
        self.write_data(0x3F)
        self.write_data(0x44)
        self.write_data(0x51)
        self.write_data(0x2F)
        self.write_data(0x1F)
        self.write_data(0x1F)
        self.write_data(0x20)
        self.write_data(0x23)
 
        self.write_cmd(0x21)
 
        self.write_cmd(0x11)
 
        self.write_cmd(0x29)
 
    def show(self):
        self.write_cmd(0x2A)
        self.write_data(0x00)
        self.write_data(0x00)
        self.write_data(0x01)
        self.write_data(0x3f)
 
        self.write_cmd(0x2B)
        self.write_data(0x00)
        self.write_data(0x00)
        self.write_data(0x00)
        self.write_data(0xEF)
 
        self.write_cmd(0x2C)
 
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(self.buffer)
        self.cs(1)
 
 
if __name__=='__main__':
    pwm = PWM(Pin(BL))
    pwm.freq(1000)
    pwm.duty_u16(32768)#max 65535
 
    LCD = LCD_2inch()
    #color BRG
    LCD.fill(LCD.WHITE)
 
 
    time.sleep(0.1)
    LCD.fill_rect(0,0,320,24,LCD.RED)
    LCD.rect(0,0,320,24,LCD.RED)
    LCD.text("Raspberry Pi Pico",2,8,LCD.WHITE)
 
    LCD.fill_rect(0,24,320,24,LCD.BLUE)
    LCD.rect(0,24,320,24,LCD.BLUE)
    LCD.text("PicoGo",2,32,LCD.WHITE)
 
    LCD.fill_rect(0,48,320,24,LCD.GREEN)
    LCD.rect(0,48,320,24,LCD.GREEN)
    LCD.text("Pico-LCD-2",2,54,LCD.WHITE)
 
    LCD.fill_rect(0,72,320,24,0X07FF)
    LCD.rect(0,72,320,24,0X07FF)
 
    LCD.fill_rect(0,96,320,24,0xF81F)
    LCD.rect(0,96,320,24,0xF81F)
 
    LCD.fill_rect(0,120,320,24,0x7FFF)
    LCD.rect(0,120,320,24,0x7FFF)
 
    LCD.fill_rect(0,144,320,24,0xFFE0)
    LCD.rect(0,144,320,24,0xFFE0)
 
    LCD.fill_rect(0,168,320,24,0XBC40)
    LCD.rect(0,168,320,24,0XBC40)
 
    LCD.fill_rect(0,192,320,24,0XFC07)
    LCD.rect(0,192,320,24,0XFC07)
    LCD.fill_rect(0,216,320,24,0X8430)
    LCD.rect(0,216,320,24,0X8430)
 
    time.sleep(2)
    LCD.show()
    LCD.fill(0xFFFF)
    time.sleep(1)
    key0 = Pin(15,Pin.IN,Pin.PULL_UP) 
    key1 = Pin(17,Pin.IN,Pin.PULL_UP)
    key2 = Pin(2 ,Pin.IN,Pin.PULL_UP)
    key3 = Pin(3 ,Pin.IN,Pin.PULL_UP)
 
    while(1):      
        if(key0.value() == 0):
            LCD.fill_rect(12,12,20,20,LCD.BLACK)
        else :
            LCD.fill_rect(12,12,20,20,LCD.WHITE)
            LCD.rect(12,12,20,20,LCD.RED)
 
        if(key1.value() == 0):
            LCD.fill_rect(288,12,20,20,LCD.RED)
        else :
            LCD.fill_rect(288,12,20,20,LCD.WHITE)
            LCD.rect(288,12,20,20,LCD.RED)
 
        if(key2.value() == 0):
            LCD.fill_rect(288,208,20,20,LCD.GREEN)
        else :
            LCD.fill_rect(288,208,20,20,LCD.WHITE)
            LCD.rect(288,208,20,20,LCD.RED)
        if(key3.value() == 0):
 
            LCD.fill_rect(12,208,20,20,LCD.BLUE)
        else :
            LCD.fill_rect(12,208,20,20,LCD.WHITE)
            LCD.rect(12,208,20,20,LCD.RED) 
 
        LCD.show()
    time.sleep(1)
 
    LCD.fill(0xFFFF)

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