import machine
import math
import utime

# Constants
BETA = 3950  # Beta coefficient of the thermistor
R1 = 10000   # Series resistor value (in ohms)
V_REF = 3.3  # Reference voltage (Raspberry Pi Pico)

# Initialize ADC on Pin 28
adc = machine.ADC(machine.Pin(28))

while True:
    # Read the raw ADC value
    analog_value = adc.read_u16()
    
    # Convert ADC value to voltage
    voltage = (analog_value / 65535) * V_REF

    # Calculate the resistance of the thermistor
    if voltage == 0:
        print("Voltage is 0V, skipping calculation to avoid division by zero.")
        continue

    resistance = R1 / ((V_REF / voltage) - 1)

    # Calculate temperature in Kelvin using the Beta formula
    kelvin = 1 / (1 / 298.15 + (1 / BETA) * math.log(resistance / 10000))

    # Convert Kelvin to Celsius
    celsius = kelvin - 273.15

    # Print the temperature
    print("CSE Classroom Temperature: {:.2f} °C (DR.G.U POPE)".format(celsius))

    # Delay for 1 second
    utime.sleep(1)