from machine import ADC, Pin
from time import sleep

# MQ sensor analog output on GP26 (ADC0)
gas_sensor = ADC(26)

# Alert devices
led = Pin(2, Pin.OUT)
buzzer = Pin(28, Pin.OUT)

# Optional: Digital output from MQ sensor
gas_digital = Pin(15, Pin.IN)

while True:
    analog_value = gas_sensor.read_u16()  # 0–65535
    voltage = analog_value * 3.3 / 65535  # Convert to volts

    print("Gas Level:", analog_value, "Voltage:", round(voltage, 2), "V")

    # Threshold (adjust as needed)
    if analog_value > 35000 or gas_digital.value() == 1:
        print("⚠️ High Gas Detected!")
        led.on()
        buzzer.on()
       
    else:
        led.off()
        buzzer.off()

    sleep(5)