import network
import machine
import time
import urequests
import dht
from machine import Pin, time_pulse_us

SSID = "Wokwi-GUEST"
PASSWORD = ""

pir = Pin(15, Pin.IN, Pin.PULL_DOWN)
dht_sensor = dht.DHT22(Pin(12))

THINGSPEAK_URL = "https://api.thingspeak.com/update.json"
THINGSPEAK_API_KEY = "6Y1NWMB6LOMF4CHN"

trig_pin = Pin(5, Pin.OUT)
echo_pin = Pin(18, Pin.IN)

def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(SSID, PASSWORD)
    print("Conectando a WiFi...")
    while not wlan.isconnected():
        time.sleep(1)
    print("Conectado exitosamente a WiFi:", wlan.ifconfig())

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

    try:
        duration_us = time_pulse_us(echo_pin, 1, 30000)  
        distance_cm = duration_us / 58.0
        return distance_cm
    except OSError:
        print("Error: tiempo de espera excedido para eco.")
        return -1  

def enviar_a_thingspeak(temp, humidity, distancia, estado):
    data = {
        "api_key": THINGSPEAK_API_KEY,
        "field1": temp,
        "field2": humidity,
        "field3": distancia,
        "field4": estado,
    }
    try:
        respuesta = urequests.post(THINGSPEAK_URL, json=data)
        print("Enviado a ThingSpeak:", respuesta.text)
        respuesta.close()
    except Exception as e:
        print("Error al enviar datos:", e)

connect_wifi()

try:
    while True:
     
        estado = pir.value()
        print("Estado PIR:", estado)
       
        dht_sensor.measure()
        temp = dht_sensor.temperature()
        humidity = dht_sensor.humidity()
        print("Temperatura:", temp, "°C")
        print("Humedad:", humidity, "%")

        distancia = medir_distancia()
        if distancia >= 0:
            print(f"Distancia medida: {distancia:.2f} cm")
        else:
            print("No se pudo medir la distancia.")
            distancia = -1  

        enviar_a_thingspeak(temp, humidity, distancia, estado)

        time.sleep(5)
except KeyboardInterrupt:
    print("Programa detenido.")