Various Raspberry Pi Pico I2C LCD clock examples

In this article we look at another few examples to display on an I2C 16×2 LCD to a raspberry Pi Pico

 

Parts Required

 

Name	Link
Pico	Raspberry Pi Pico Development Board
I2C lCD	Aliexpress link
Connecting cables	Aliexpress product link Lysee 3D Printer Parts & Accessories – AHT20 Temperature and Humidity Sensor Module DHT11 Upgrade I2C XD Humidity Sensor Probe – (Color: Green) Ebay link

 

Schematic/Connection

To connect the display to your Raspberry PI Pico requires just 4 wires, you just need to wire the Vcc and GND PINs from display to VBuS and a GND PINs of RPI Pico, then SDA and SCL PINs from the module to suitable SDA and SCL PINs from Raspberry PI Pico

Here is a layout in fritzing to show this

 

Code Examples

I use thonny for all development – we have kept this information from our 16×2 LCD article

You then need to copy 2 libraries to your Pico filesystem

In Thonny, go to top menu File => Save Copy => Raspberry Pi Pico and save each file to the board with the same name as downloaded and with a .PY extension when saving it to the board.

https://github.com/T-622/RPI-PICO-I2C-LCD/blob/main/lcd_api.py

https://github.com/T-622/RPI-PICO-I2C-LCD/blob/main/pico_i2c_lcd.py

In this example we display the 3 custom characters that we designed earlier

Counter

This simply counts from 0 to 10 and displays it on the lcd

import machine
from machine import I2C
from lcd_api import LcdApi
from pico_i2c_lcd import I2cLcd
from time import sleep

I2C_ADDR = 0x27
totalRows = 2
totalColumns = 16

i2c = I2C(0, sda=machine.Pin(0), scl=machine.Pin(1), freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, totalRows, totalColumns)

while True:
    lcd.putstr("Count - 0-10")
    sleep(2)
    lcd.clear()
    for i in range(10):
        lcd.putstr(str(i))
        sleep(1)
        lcd.clear()

Another example

This displays the I2C address on the LCD in hex and then in decimal, it also displays txt on the LCD. We then switch the backlight on and off. We then count to 20.

from machine import I2C, Pin
from time import sleep
from pico_i2c_lcd import I2cLcd
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)

I2C_ADDR = i2c.scan()[0]
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

while True:
    print(I2C_ADDR)
    lcd.blink_cursor_on()
    lcd.putstr("I2C Address:"+str(I2C_ADDR)+"\n")
    lcd.putstr("rp2040learning")
    sleep(2)
    lcd.clear()
    lcd.putstr("I2C Address:"+str(hex(I2C_ADDR))+"\n")
    lcd.putstr("rp2040learning")
    sleep(2)
    lcd.blink_cursor_off()
    lcd.clear()
    lcd.putstr("Backlight Test")
    for i in range(10):
        lcd.backlight_on()
        sleep(0.2)
        lcd.backlight_off()
        sleep(0.2)
    lcd.backlight_on()
    lcd.hide_cursor()
    for i in range(20):
        lcd.putstr(str(i))
        sleep(1)
        lcd.clear()

 

Links