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Interfacing 16×2 I2C LCD with Raspberry Pi Pico – Micro-Python Tutorial

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In this tutorial, we will learn how to interface a 16×2 I2C LCD with the Raspberry Pi Pico using Micro-Python to display messages and control cursor positions.

Buy Basic Raspberry Pi Pico Kit

Note:

Make sure your LCD has an I2C backpack, and you know its I2C address (default is usually 0x27 or 0x3F).

Items Required:

Connections:

  • SDA (LCD) → GPIO 4 (Pico)
  • SCL (LCD) → GPIO 5 (Pico)
  • VCC → 3.3V(also can use 5 volts)
  • GND → GND

Download Code

Code:

from machine import Pin, SoftI2C
from pico_i2c_lcd import I2cLcd
from time import sleep

# Define the LCD I2C address and dimensions
I2C_ADDR = 0x3f
I2C_NUM_ROWS = 2
I2C_NUM_COLS = 16

# Initialize I2C and LCD objects
i2c = SoftI2C(sda=Pin(0), scl=Pin(1), freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, I2C_NUM_ROWS, I2C_NUM_COLS)

lcd.putstr("It's working :)")
sleep(4)

try:
    while True:
        # Clear the LCD
        lcd.clear()
        # Display two different messages on different lines
        # By default, it will start at (0,0) if the display is empty
        lcd.putstr("Hello World!")
        sleep(2)
        lcd.clear()
        # Starting at the second line (0, 1)
        lcd.move_to(0, 1)
        lcd.putstr("Hello World!")
        sleep(2)

except KeyboardInterrupt:
    # Turn off the display
    print("Keyboard interrupt")
    lcd.backlight_off()
    lcd.display_off()

Result:

The LCD will initially display “It’s working :)” for 4 seconds. Then, in a loop, it will display “Hello World!” on the first line, then on the second line, switching every 2 seconds. This demonstrates text display and cursor control on the I2C LCD.

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