from machine import Pin, ADC
from time import sleep

# Define pins
mq2_pin = ADC(Pin(34))       # MQ-2 sensor (analog)
pir_pin = Pin(27, Pin.IN)    # PIR sensor (digital)
led_pin = Pin(25, Pin.OUT)   # Red LED
#buzzer_pin = Pin(26, Pin.OUT)# Buzzer

# Configure ADC
mq2_pin.atten(ADC.ATTN_11DB)  # Full range 0–3.3V

# Set a gas threshold (adjust as needed)
GAS_THRESHOLD = 1500

while True:
    gas_value = mq2_pin.read()
    motion_detected = pir_pin.value()
    
    print("Gas Level:", gas_value, " | Motion:", motion_detected)
    
    if gas_value > GAS_THRESHOLD:
        led_pin.on()
        buzzer_pin.on()
        print("⚠️  Gas leakage detected!")
        
        if motion_detected:
            print("🚨 ALERT: Gas leakage + Motion detected nearby!")
        else:
            print("Gas detected but no motion.")
    else:
        led_pin.off()
        #buzzer_pin.off()
    
    sleep(1)