// --- Luis Angel Guanilo Esteves - Internet de las Cosas (IoT)
// --- Semana 10 - Plataforma ThingSpeak

#include <WiFi.h>
#include <HTTPClient.h>
#include "DHT.h"

// adicionar para l2c
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // 

//gddd


// --- Configuración del sensor DHT22 ---
#define DHTPIN 16
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// --- Pin analógico para leer voltaje simulado ---
#define VOLT_PIN 34

// --- Pines de LEDs ---
const int led1 = 2;   // LED 1 rojo
const int led2 = 4;   // LED 2 azul 

// --- Configuración WiFi ---
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// --- Configuración ThingSpeak ---
String writeAPIKey = "Q0BYJP5SMVAKFWZ6";  //  API Key de escritura
String readAPIKey = "9ZYXLG0JTKW2QQRK";   //  API Key de lectura
String channelID = "3140330";             //  Channel ID
const char* server = "http://api.thingspeak.com/update";

void setup() {
  //---
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Sistema Listo!");
  delay(1000);
  lcd.clear();
  //---
  
  Serial.begin(115200);
  dht.begin();
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(VOLT_PIN, INPUT);

  WiFi.begin(ssid, password);
  Serial.print("Conectando a WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConectado a WiFi");
}

void loop() {

  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int sensorValue = analogRead(VOLT_PIN);
  float voltaje = (sensorValue / 4095.0) * 3.3;  // voltaje simulado 0–3.3V

  if (isnan(temp) || isnan(hum)) {
    Serial.println("Error al leer el sensor DHT22");
    return;
  }

  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;

    // --- Enviar datos a ThingSpeak ---
    String url = String(server) + "?api_key=" + writeAPIKey +
                 "&field1=" + String(temp) +
                 "&field2=" + String(hum) +
                 "&field3=" + String(voltaje);
    http.begin(url);
    int httpResponseCode = http.GET();
    Serial.println("Datos enviados a ThingSpeak: " + url);
    http.end();

    // --- Leer estados de LEDs desde ThingSpeak ---
    // LED 1 -> Field4
    String readUrl1 = "http://api.thingspeak.com/channels/" + channelID +
                      "/fields/4/last.txt?api_key=" + readAPIKey;
    http.begin(readUrl1);
    int httpCode1 = http.GET();
    if (httpCode1 > 0) {
      String payload1 = http.getString();
      int estadoLED1 = payload1.toInt();
      digitalWrite(led1, estadoLED1 == 1 ? HIGH : LOW);
      Serial.println("LED 1: " + payload1);
    }
    http.end();

    // LED 2 -> Field5
    String readUrl2 = "http://api.thingspeak.com/channels/" + channelID +
                      "/fields/5/last.txt?api_key=" + readAPIKey;
    http.begin(readUrl2);
    int httpCode2 = http.GET();
    if (httpCode2 > 0) {
      String payload2 = http.getString();
      int estadoLED2 = payload2.toInt();
      digitalWrite(led2, estadoLED2 == 1 ? HIGH : LOW);
      Serial.println("LED 2: " + payload2);
    }
    http.end();

    // --- Mostrar datos en LCD ---
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("T:");
    lcd.print(temp, 1);   
    lcd.print("C H:");
    lcd.print(hum, 0);    
    lcd.print("%");

    lcd.setCursor(0, 1);
    lcd.print("V:");
    lcd.print(voltaje, 2);
    lcd.print(" L1:");
    lcd.print(digitalRead(led1)); //  muestra estado real del LED1
    lcd.print(" L2:");
    lcd.print(digitalRead(led2)); //  muestra estado real del LED2



  }

  delay(15000); // Límite de actualización gratuito de ThingSpeak
}