import machine
import math
import utime
BETA = 3950
R1 = 10000
V_REF = 3.3

adc= machine.ADC(machine.Pin(28))

while True:
    analog_value = adc.read_u16()
    print( analog_value)
    voltage = (analog_value / 65535) *V_REF
    print(voltage)
    resistance = R1 / ((V_REF / voltage) -1)

    kelvin =1 / (1/ 298.15 + 1/ BETA * math.log(resistance / 10000))
    celsius = kelvin -273.15

    print("Temperature: {:.2f} °C" .format(celsius))
    utime.sleep(1)