from machine import Pin, SoftI2C, ADC
from i2c_lcd import I2cLcd
from time import sleep_ms

i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=400000)
lcd = I2cLcd(i2c, 0x27, 2, 16) #i2c, address, 2 rows, 16 cols

lcd.backlight_on()
lcd.clear()
lcd.putstr("ADC:\n")
lcd.putstr("Vol:")

pot = ADC(Pin(35))
pot.atten(ADC.ATTN_11DB)

while True:
    val = pot.read()
    lcd.move_to(5, 0)
    lcd.putstr("%-5d" %(val))
    lcd.move_to(5, 1)
    voltage = str((val*5)/4059) # convert to voltage
    lcd.putstr("%sV" %(voltage[0:3]))
    sleep_ms(500)