from machine import Pin, ADC, PWM
from time import sleep

# LEDs
led_vert = Pin(18, Pin.OUT)
led_jaune = Pin(16, Pin.OUT)
led_rouge = Pin(17, Pin.OUT)

# Buzzer
buzzer = PWM(Pin(12))

# Capteur gaz
gaz = ADC(26)

while True:

    valeur = gaz.read_u16()


    # ETAT NORMAL
    if valeur < 20000:

        led_vert.on()
        led_jaune.off()
        led_rouge.off()

        buzzer.duty_u16(0)

    # PRE-ALERTE
    elif valeur < 40000:

        led_vert.off()
        led_jaune.on()
        led_rouge.off()

        buzzer.freq(1000)
        buzzer.duty_u16(15000)

        sleep(0.2)

        buzzer.duty_u16(0)

        sleep(0.3)

    # ALARME
    else:

        led_vert.off()
        led_jaune.off()
        led_rouge.on()

        buzzer.freq(2000)
        buzzer.duty_u16(30000)

    print("Valeur gaz :", valeur)

    sleep(0.1)