import dht
from machine import Pin
from time import sleep

# Setup DHT22 sensor
sensor = dht.DHT22(Pin(4))

# Setup relay
relay = Pin(5, Pin.OUT)

# Temperature threshold
TEMP_THRESHOLD = 20  # degrees Celsius

while True:
    try:
        sensor.measure()
        temperature = sensor.temperature()
        print(f'Temperature: {temperature}°C')

        # Check temperature against threshold
        if temperature > TEMP_THRESHOLD:
            relay.on()  # Turn on the fan or alarm
            print("Alert! Temperature exceeded threshold. Fan ON.")
        else:
            relay.off()  # Turn off the fan or alarm
            print("Temperature within normal range. Fan OFF.")
        
    except OSError as e:
        print('Failed to read sensor.')
        
    sleep(2)