from machine import ADC, Pin
import time

# Initialize gas sensor and LEDs
gas_sensor = ADC(26)  # GP26 = ADC0
led_low = Pin(15, Pin.OUT)
led_medium = Pin(14, Pin.OUT)
led_high = Pin(13, Pin.OUT)

def display_level(value):
    # Reset LEDs
    led_low.off()
    led_medium.off()
    led_high.off()
    
    # Define gas levels
    if value < 1000:
        led_low.on()
        print("Gas Level: LOW =", value)
    elif value < 2000:
        led_medium.on()
        print("Gas Level: MEDIUM =", value)
    else:
        led_high.on()
        print("Gas Level: HIGH =", value)

while True:
    gas_value = gas_sensor.read_u16() >> 4  # Convert to 12-bit (0–4095)
    display_level(gas_value)
    time.sleep(1)