The following program can control an LCD screen through an I2C protocol connected to Raspberry Pi Pico. The serial data(SDA) pin is connected to Pin 0 and the serial clock (SCL) pin is connected to Pin 1 of Pico. The LCD screen takes 5V.
Please remember that we need two I2C libraries. You can download that library from https://github.com/T-622/RPI-PICO-I2C-LCD. Upload the lcd_api.py and pico_i2c_lcd.py to your Pico before running the following code.
import utime
import machine
from machine import I2C
from lcd_api import LcdApi
from pico_i2c_lcd import I2cLcd
I2C_ADDR = 0x27
I2C_NUM_ROWS = 2
I2C_NUM_COLS = 16
i2c = I2C(0, sda=machine.Pin(0), scl=machine.Pin(1), freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, I2C_NUM_ROWS, I2C_NUM_COLS)
lcd.clear()
lcd.move_to(14,0)
lcd.putstr("It Works")