#include "DHT.h"
#include <Wire.h>
#include "Adafruit_GFX.h"
#include "Adafruit_SSD1306.h"

#define LDR A0
#define DHTPIN 12     // Digital pin connected to the DHT sensor

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

#define LED_G 4
#define LED_R 15
#define LED_Y 5
#define BUZZ_PIN 14

#define PIR_SENSOR 13

#define POT_PIN A0

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define TIME_DELAY 2000

#define OLED_RESET -1

int warm_up;

bool objeto_detectado = false;

DHT dht(DHTPIN, DHTTYPE);
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(PIR_SENSOR, INPUT);
  pinMode(LED_R, OUTPUT);
  pinMode(LED_G, OUTPUT);
  pinMode(LED_Y, OUTPUT);
  pinMode(BUZZ_PIN, OUTPUT);

  dht.begin();

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(TIME_DELAY);

  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);

  display.println("IoT Bloque ENESJ");

  display.display();

  Serial.println("Esperando a que inicie el sensor PIR");
  //delay(TIME_DELAY * 5);
  delay(TIME_DELAY);

  Serial.println("Listo");
}

void loop() {
  int salida_sensor = digitalRead(PIR_SENSOR);

  if( salida_sensor == LOW ){
    if( warm_up == 1){
      Serial.print("Calentando\n");
      warm_up = 0;
      delay(2000);
    }
    //Serial.print("Objeto no detectado\n");
    objeto_detectado = false;
    delay(500);
  }
  else{
    //Serial.print("Objeto detectado\n");
    objeto_detectado = true;
    warm_up = 1;
    delay(500);
  }

  if(objeto_detectado){
    int raw = analogRead(LDR);
    int lux = map(raw, 32, 4063, 100000, 0.1);

    float h = dht.readHumidity();
    // Read temperature as Celsius (the default)
    float t = dht.readTemperature();
    // Read temperature as Fahrenheit (isFahrenheit = true)
    float f = dht.readTemperature(true);
    
    // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t) || isnan(f)) {
      Serial.println(F("Failed to read from DHT sensor!"));
      return;
    }
    else {
      display.clearDisplay();

      display.setCursor(0, 0);
      display.print("Lux: ");
      display.println(lux);
      display.setCursor(0, 20);
      display.print("Humidity: ");
      display.print(h);
      display.println("%");
      display.setCursor(0, 40);
      display.print("Temp: ");
      display.print(t);
      display.print((char)0176);
      display.println("C");

      display.display();
    }

    if( 15 < t && t < 20 ){
      digitalWrite(LED_G, HIGH);
      digitalWrite(LED_Y, LOW);
      digitalWrite(LED_R, LOW);
      digitalWrite(BUZZ_PIN, LOW);
    }
    else if( 20 <= t && t < 28 ){
      digitalWrite(LED_Y, HIGH);
      digitalWrite(LED_G, LOW);
      digitalWrite(LED_R, LOW);
      digitalWrite(BUZZ_PIN, LOW);
    }
    else if( t >= 28 ){
      digitalWrite(LED_R, HIGH);
      digitalWrite(LED_Y, LOW);
      digitalWrite(LED_G, LOW);
      digitalWrite(BUZZ_PIN, HIGH);
    }
    else {
      digitalWrite(LED_R, LOW);
      digitalWrite(LED_Y, LOW);
      digitalWrite(LED_G, LOW);
      digitalWrite(BUZZ_PIN, LOW);
    }
  }
  
  // Wait a few seconds between measurements.
  delay(2000);
}