from machine import Pin, ADC, PWM
import time

# Define pins
gas_sensor = ADC(26)  # MQ-2 sensor connected to GP26 (ADC0)
buzzer = PWM(Pin(15))  # Buzzer connected to GP15 using PWM
buzzer.freq(1000)  # Set frequency to 1kHz (adjustable)

# Threshold for LPG detection
GAS_THRESHOLD = 61500  

while True:
    gas_value = gas_sensor.read_u16()  # Read sensor value
    print("Gas Sensor Value:", gas_value)  # Print sensor value in Serial Monitor

    if gas_value > GAS_THRESHOLD:
        print("LPG Gas Detected! Activating buzzer...")
        buzzer.duty_u16(61500)  # Turn on buzzer
    else:
        print("No Gas Detected. Buzzer OFF.")
        buzzer.duty_u16(0)  # Turn off buzzer

    time.sleep(1)