import time
from machine import Pin, ADC
from utime import sleep
import math

#Definition of pin numbers
b0 = machine.Pin(0, machine.Pin.IN)
l0 = machine.Pin(1, machine.Pin.OUT)
temp_sensor = machine.Pin(26, machine.Pin.IN)

adc = ADC(0)
BETA = 3950
temp = 0
pressed_pin = 0

#Interrupt function
button_state = 0
def interrupt_callback(pin):

    global button_state, pressed_pin
    button_state = button_state << 1 | pin.value()
    button_state = button_state & 0xFF
    if button_state == 0x80:
        pressed_pin = 1

#Main function
def main():
    global pressed_pin, b0, l0, temp_sensor, adc, BETA, temp
    b0.irq(trigger = machine.Pin.IRQ_FALLING, handler = interrupt_callback)

    while True:
        analogValue = adc.read_u16()
        temp = 1 / (math.log(1 / (65535. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15
        if pressed_pin:
            for x in range(5):
                print(f"{temp:.2f} °C")
                sleep(0.5)
            pressed_pin = 0
if __name__ == "__main__":
    main()