import machine 

import utime 

  

sensor_temp = machine.ADC(4) 
led_external = machine.Pin(15, machine.Pin.OUT) 
  

conversion_factor = 3.3 / (65535) 

  

while True: 

 
    led_external.toggle() 

    reading = sensor_temp.read_u16() * conversion_factor 

    temperature = 27 - (reading - 0.706)/0.001721 

    print(temperature) 

    utime.sleep(2)