from machine import Pin, PWM, ADC
import dht
import time

dht_sensor = dht.DHT22(Pin(4, Pin.IN, Pin.PULL_UP))
led = Pin(2, Pin.OUT)  
mq2 = ADC(Pin(27))  
mq2.atten(ADC.ATTN_11DB)  
buzzer = PWM(Pin(18))
buzzer.freq(1000)
buzzer.duty(0)

while True:
    try:
        dht_sensor.measure()  
        temperature = dht_sensor.temperature()  
        humidity = dht_sensor.humidity()  

        print("Temperature:", temperature, "°C", "Humidity:", humidity, "%")

        if temperature > 30:  
            led.on()
            print("LED ON")
        elif temperature < 25:  
            led.off()
            print("LED OFF")

        adc_value = mq2.read()
        ppm = adc_value * (1000 / 4095)  

        if ppm < 350:
            buzzer.duty(500)
            print("high gas detected! Buzzer ON")
        else:
            buzzer.duty(0)
            print("Gas level low. Buzzer OFF")

    except OSError:
        print("Sensor reading failed.")

    time.sleep(2)