#include <LiquidCrystal_I2C.h>
#include "DHTesp.h"

DHTesp dht;

LiquidCrystal_I2C lcd(0x27, 16, 2);
// lecturas
const int pot = 35;

const int tem = 14;
int temperatura;

const int luz = 32;


const float GAMMA = 0.7;
const float RL10 = 50;

byte degreeSymbol[8] = {
  B01110,
  B01010,
  B01110,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000
};

// boton 
const int BUTTON = 12;
volatile bool buttonPressed = false;
volatile unsigned long buttonPressStartTime = 0;

unsigned long elapsedTime;

unsigned long lastPrintTime = 0;
bool x = false;
bool y = false;

bool t = false;
bool l = false;
bool p = false;


void buttonInterrupt() {

  if (digitalRead(BUTTON) == HIGH) {
    buttonPressed = true;

    buttonPressStartTime = millis();
    
    
    
  } else {
    buttonPressed = false;
    
  }
}






void setup() {
  // put your setup code here, to run once
   Serial.begin(115200);
  Wire.begin();

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Datos: ");

  lcd.createChar(0, degreeSymbol);

  pinMode(pot, INPUT);
  
  pinMode(luz, INPUT);
  pinMode(BUTTON, OUTPUT);
  dht.setup(tem, DHTesp::DHT22);

  attachInterrupt(digitalPinToInterrupt(BUTTON), buttonInterrupt, CHANGE);

}


void potenciometro(){

}

void loop() {

  //lectura del boton //////////////////////////////////////////////////////////////

  if (buttonPressed) {
    elapsedTime = millis() - buttonPressStartTime;

    unsigned long currentTime = millis();

    if (currentTime - lastPrintTime >= 20){
    Serial.println(elapsedTime);
    lastPrintTime = currentTime;
  }
  }


//temperatura ////////////////////////////////////////////////////////////////////////

 if (elapsedTime >= 20 && elapsedTime < 1000 && buttonPressed == LOW && y == false){
 lcd.setCursor(0,1);
  lcd.print("               ");
  noInterrupts();
  
   l = false;
    y = true;
    x = false;
    t = true;
    p = false;
    elapsedTime = 0;
    interrupts();
  }

if (t == true){

  TempAndHumidity data = dht.getTempAndHumidity();
  Serial.println("temperatura");
   int temperatura = data.temperature;
   lcd.setCursor(13,1);
   lcd.write((uint8_t)0);
   lcd.setCursor(0,1);
   lcd.print("temp : " ) ;
   lcd.setCursor(7,1);
   lcd.print( String(data.temperature, 2) );
   lcd.print("       ");
   lcd.setCursor(14,1);
  lcd.print("C" ) ;

}

    //luz /////////////////////////////////////////////////////////////////////////////

if (elapsedTime >= 20 && elapsedTime < 1000 && buttonPressed == LOW && y == true){
    
    lcd.setCursor(0,1);
    lcd.print("               ");
    noInterrupts();
    
    t = false;
    y = false;
    x = false;
    l = true;
    p = false;
    elapsedTime = 0;
    interrupts();
   
  }

if (l == true){

  Serial.println("luz");
   int light = analogRead(luz);
  float dato2 = light / 4095. * 5;
  float resistance = 2000 * dato2 / (1 - dato2 / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  lcd.setCursor(0,1);
  lcd.print("luz: ");
  lcd.setCursor(5,1);
  lcd.print(lux);
  lcd.print("     ");

}


 // voltage ///////////////////////////////////////////////////////////////////////////////////

 if (elapsedTime >= 3000 && buttonPressed == LOW && x == false ){

  lcd.setCursor(0,1);
    lcd.print("               ");

    noInterrupts();
    t = false;
    l = false;
    p = true;
    x = true;
    elapsedTime = 0;
    interrupts();
  }

  if(p == true){

    Serial.println("voltage");

 int dato1 = analogRead(pot);
  float voltage = map(dato1,0,4095,0,500);
  voltage = voltage /100;
  lcd.setCursor(0,1);
  lcd.print("voltaje: ");
  lcd.setCursor(10,1);
  lcd.print(voltage);
  lcd.setCursor(14,1);
  lcd.print("V");


  }

 

  
  
  
  
}