rom machine import Pin, ADC
import time

# MQ2 setup
mq2 = ADC(Pin(34))          # Connect MQ2 analog output to GPIO 34
mq2.atten(ADC.ATTN_11DB)    # Full range 0-3.3V
mq2.width(ADC.WIDTH_12BIT)  # 12-bit resolution (0-4095)

# Buzzer setup
buzzer = Pin(26, Pin.OUT)

# Threshold for gas detection
THRESHOLD = 2500  # ppm or raw ADC value approximation

while True:
    gas_level = mq2.read()  # Read analog value (0-4095)
    print("Gas level:", gas_level)
    
    if gas_level > THRESHOLD:
        buzzer.value(1)   # Turn buzzer ON
        print("Alert! Gas level too high!")
    else:
        buzzer.value(0)   # Turn buzzer OFF
    
    time.sleep(1)  # 1-second delay