from machine import Pin, ADC
import dht
import time

# Pin setup
pir = Pin(15, Pin.IN)
gas_sensor = ADC(26)
dht_sensor = dht.DHT22(Pin(14))
buzzer = Pin(13, Pin.OUT)
led = Pin(12, Pin.OUT)

def motion_detected(pin):
    print("🚨 Motion Detected!")
    buzzer.value(1)
    led.value(1)
    time.sleep(1)
    buzzer.value(0)
    led.value(0)

# PIR interrupt
pir.irq(trigger=Pin.IRQ_RISING, handler=motion_detected)

while True:
    dht_sensor.measure()
    temp = dht_sensor.temperature()
    hum = dht_sensor.humidity()
    gas = gas_sensor.read_u16() / 65535 * 100

    print(f"Temp: {temp}°C, Humidity: {hum}%, Gas Level: {gas:.1f}%")

    # Gas warning test
    if gas > 50:
        print("⚠️ Gas Leak Detected!")
        buzzer.value(1)
        led.value(1)
        time.sleep(1)
        buzzer.value(0)
        led.value(0)

    time.sleep(2)