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

## Constants
BETA = 3950
KELVIN_CONSTANT = 273.15

## Functions
def adc_to_celsius(x):
    return (1 / (log(1/(65535/x - 1))/BETA + 1/298.15) - KELVIN_CONSTANT)

sensor_temp = ADC(26)
green_led = Pin(14, Pin.OUT)
red_led = Pin(15, Pin.OUT)

while True:
    reading = sensor_temp.read_u16()
    temperature = adc_to_celsius(reading)
    print(temperature)
    if (temperature > 20):
        red_led.on()
        green_led.off()
        print("Too Hot! The temperature is:", temperature, "(Celcius)")
    elif (temperature <15):
        red_led.off()
        green_led.on()
        print("Too Cold! The temperature is:", temperature, "(Celcius)")
    else:
        print("In range! The temperature is:", temperature, "(Celcius)")
        red_led.off()
        green_led.off()

    sleep(2)