from machine import ADC, Pin
import math
import time

BETA = 3950

R1 = 10000

V_in = 5.0

adc = ADC(Pin(2))
adc.atten(ADC.ATTN_11DB)

def read_ntc_temperature():
    analog_value = adc.read()
    print(analog_value)

    V_out = (analog_value / 4096.0) * V_in
    R2 = R1 * (V_in / V_out -1)


    temperature_kelvin = 1 / (math.log(R2 / R1) / BETA + 1.0 / 298.15) 
    temperature_celsius = temperature_kelvin - 273.15
    return temperature_celsius

while True:
    temperature = read_ntc_temperature()
    print("Temperature: {:.2f} ℃".format(temperature))
    time.sleep(1)