from machine import Pin, ADC, time_pulse_us
import dht
import time

trig = Pin(5, Pin.OUT)
echo = Pin(18, Pin.IN)

mq2 = ADC(Pin(12))
mq2.atten(ADC.ATTN_11DB)  

pir = Pin(0, Pin.IN)

sensor = dht.DHT22(Pin(23))

led_dist = Pin(4, Pin.OUT)
led_gas = Pin(27, Pin.OUT)
led_pir = Pin(2, Pin.OUT)
led_temp = Pin(22, Pin.OUT)

DIST_MIN = 20      
GAS_MAX = 2000     
TEMP_MAX = 28      
TIEMPO_PIR = 5000  

lecturas_gas = []   
temp = 0
hum = 0
hubo_mov = False
t_pir = 0
t_dht = 0
t_print = 0

def medir_distancia():
    trig.value(0)
    time.sleep_us(2)
    trig.value(1)
    time.sleep_us(10)
    trig.value(0)

    duracion = time_pulse_us(echo, 1, 30000)
    if duracion < 0:
        return 999  
    distancia = (duracion / 2) / 29.1  
    return distancia


def promedio_gas():
    lecturas_gas.append(mq2.read())
    if len(lecturas_gas) > 5:
        lecturas_gas.pop(0)

    total = 0
    for v in lecturas_gas:
        total = total + v
    return total / len(lecturas_gas)


def monitoreo():
    global temp, hum, hubo_mov, t_pir, t_dht, t_print
    ahora = time.ticks_ms()

    d = medir_distancia()
    if d < DIST_MIN:
        led_dist.value(1)
    else:
        led_dist.value(0)

    gas = promedio_gas()
    if gas > GAS_MAX:
        if (ahora // 100) % 2 == 0:
            led_gas.value(1)
        else:
            led_gas.value(0)
    else:
        led_gas.value(0)

    if pir.value() == 1:
        hubo_mov = True
        t_pir = ahora
    if hubo_mov and time.ticks_diff(ahora, t_pir) < TIEMPO_PIR:
        led_pir.value(1)
    else:
        led_pir.value(0)
        hubo_mov = False

    if time.ticks_diff(ahora, t_dht) >= 2000:
        t_dht = ahora
        try:
            sensor.measure()
            temp = sensor.temperature()
            hum = sensor.humidity()
        except OSError as e:
            print("Error de lectura DHT22")

    if temp > TEMP_MAX:
        if (ahora // 1000) % 2 == 0:
            led_temp.value(1)
        else:
            led_temp.value(0)
    else:
        led_temp.value(0)

    if time.ticks_diff(ahora, t_print) >= 1000:
        t_print = ahora
        print("Distancia:", d, "cm")
        print("Gas:", gas)
        print("Movimiento:", pir.value())
        print("Temperatura:", temp, "°C", "Humedad:", hum, "%")
        print("-----")


while True:
    monitoreo()
    time.sleep(0.05)