from machine import Pin,PWM
from utime import sleep
import dht

print("Hello, ESP32!")
d = dht.DHT22(Pin(4))
led = Pin(15, Pin.OUT)
mq2 = Pin(2,Pin.IN)
buzzer = PWM(Pin(5))
buzzer.duty(0)



def temp():
  d.measure()
  temp = d.temperature()
  if temp > 30:
    led.on()
  elif temp < 25:
    led.off()

def gas():
    if mq2.value() == 1:  #clean
        buzzer.duty(0)  
    else:  #not clean
        buzzer.freq(1000)   # 1000Hz tone
        buzzer.duty(512)    # 50% duty cycle


while True:
    temp()
    gas()