from machine import Pin
import dht
import time

sensor = dht.DHT22(Pin(15))

green = Pin(25, Pin.OUT)
yellow = Pin(26, Pin.OUT)
red = Pin(27, Pin.OUT)

while True:
    try:
        sensor.measure()
        t = sensor.temperature()
        h = sensor.humidity()

        print("Temp:", t, "C  Humidity:", h)

        green.off()
        yellow.off()
        red.off()

        if t < 25:
            green.on()
        elif t < 30:
            yellow.on()
        else:
            red.on()

    except:
        print("Sensor error")

    time.sleep(2)