import machine
import utime
from machine import I2C
import ssd1306

i2c = I2C(0, scl=machine.Pin(21), sda=machine.Pin(22), freq=100000)

oled = ssd1306.SSD1306_I2C(128, 64, i2c)

adc = machine.ADC(machine.Pin(2))

while True:
  reading = adc.read()
  oled.fill(0)
  oled.text(str(reading), 10, 10)
  oled.show()
  utime.sleep_ms(100)