from machine import Pin, ADC
import utime

# Set up gas sensor on ADC0 (GP26)
gas_sensor = ADC(26)

# Set up fan (blue LED) on GP15
fan = Pin(15, Pin.OUT)

# Optional: startup message
print("Smart Kitchen Gas Leak Detection System Started")

while True:
    # Read analog gas level (0–65535)
    gas_level = gas_sensor.read_u16()
    print("Gas Level:", gas_level)

    # Threshold for gas leak detection
    if gas_level > 30000:
        fan.high()  # Turn on fan
        print("Gas Leak Detected! Fan ON")
    else:
        fan.low()   # Turn off fan
        print("Air is Clean. Fan OFF")

    utime.sleep(1)