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

SSID = "Wokwi-GUEST"
PASSWORD = ""

THINGSPEAK_URL = "https://api.thingspeak.com/update"
API_KEY = "5I9SW7BQ8WMFFM9D"

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

led_verde = machine.Pin(13, machine.Pin.OUT)
led_rojo = machine.Pin(2, machine.Pin.OUT)

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")

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

    duration_us = time_pulse_us(echo_pin, 1)
    distance_cm = duration_us / 58.0
   
    return distance_cm

def enviar_a_thingspeak(estado):
    url = f"{THINGSPEAK_URL}?api_key={API_KEY}&field7={estado}"
    try:
        respuesta = urequests.get(url)
        print("Enviado a ThingSpeak:", respuesta.text)
        respuesta.close()
    except Exception as e:
        print("Error al enviar datos:", e)

connect_wifi()

try:
    while True:
        distancia = medir_distancia()
        print(f"Distancia medida: {distancia:} cm")
        if distancia < 10:  
            led_rojo.on()
            led_verde.off()
            enviar_a_thingspeak(1)
        else: 
            led_rojo.off()
            led_verde.on()
            enviar_a_thingspeak(0)
        time.sleep(15) 
except KeyboardInterrupt:
    print("Programa detenido.")