from machine import Pin, ADC, SoftI2C
import ssd1306
import time

# -------------------------
# Configuração dos pinos
# -------------------------

# MQ-2
mq2 = ADC(Pin(34))
mq2.atten(ADC.ATTN_11DB)
mq2.width(ADC.WIDTH_12BIT)

# Saída digital do MQ-2 (opcional)
mq2_digital = Pin(27, Pin.IN)

# Relé
rele = Pin(26, Pin.OUT)
rele.value(0)

# OLED
i2c = SoftI2C(
    scl=Pin(22),
    sda=Pin(21)
)

oled = ssd1306.SSD1306_I2C(128, 64, i2c)

# -------------------------
# Configuração
# -------------------------

LIMITE = 2000

# -------------------------
# Loop principal
# -------------------------

while True:

    valor = mq2.read()

    # Conversão simples para ppm (simulação)
    ppm = int((valor / 4095) * 10000)

    # Aciona o relé
    if valor > LIMITE:
        rele.value(1)
        status = "ALERTA"
    else:
        rele.value(0)
        status = "NORMAL"

    # Atualiza OLED
    oled.fill(0)

    oled.text("Detector Gas", 0, 0)

    oled.text("ADC:", 0, 18)
    oled.text(str(valor), 40, 18)

    oled.text("PPM:", 0, 34)
    oled.text(str(ppm), 40, 34)

    oled.text(status, 0, 52)

    oled.show()

    # Exibe também no terminal
    print("----------------------")
    print("ADC :", valor)
    print("PPM :", ppm)
    print("Status :", status)

    time.sleep(0.5)