from machine import Pin 
import dht
import time

sensor = dht.DHT22(Pin(4))
green_led = Pin(18,Pin.OUT)
red_led = Pin(19,Pin.OUT)

while True:
    try:
        sensor.measure()
        temp = sensor.temperature()
        print("temperature:",temp,"celcius")

        if temp<30:
            green_led.on()
            red_led.off()
        else:
            green_led.off()
            red_led.on()
    except OSError:
        print("sensor error")
    time.sleep(2)