import time
from machine import Pin
from machine import ADC
from math import log

sensor_read = ADC(26)

def read(Pin):
    BETA = 3950
    bits = (2**16)-1
    digital_val = Pin.read_u16()
    analogue_voltage = float((digital_val * 3.3) / bits)
    
    #volt to celsius
    resistor = 10000
    ntc_resistance = resistor * (3.3 / analogue_voltage - 1)
    R25 = 10000  # Resistance of NTC at 25°C
    B_coefficient = 3950  # B coefficient of NTC
    Tref = 298.15  # Reference temperature in Kelvin (25°C)

    # Calculate temperature in Kelvin
    temperature_kelvin = 1 / (1 / Tref + 1 / B_coefficient * log(R25 / ntc_resistance))

    # Convert temperature from Kelvin to Celsius
    temperature_celsius = temperature_kelvin - 273.15

    return temperature_celsius

while True:
    print(read(sensor_read))
    time.sleep(5)