#include <LiquidCrystal.h>

double refV = 5;
double tL   = 25;
double tH   = tL + 1;

const int button6 = 6; // aumentar temperatura
const int button7 = 7; // diminuir temperatura

const float BETA = 3950; // Beta do termistor

int button6state = 0;
int button7state = 0;

LiquidCrystal lcd( 12, 11, 5, 4, 3, 2 ); // RS, E, D4 - D7

void setup(){
  // GPIO:
  pinMode( button6, INPUT );
  pinMode( button7, INPUT );
  
  pinMode( 10, OUTPUT );
  pinMode( 13, OUTPUT );

  // Configuração do ADC:
  analogReference( DEFAULT ); // the default analog reference of 5 volts
  
  // LCD:
  lcd.begin(16,2);
  lcd.setCursor(0,0); // linha 1, coluna 1
  lcd.print(tL);
  lcd.print(" to ");
  lcd.print(tH);

  // Porta serial:
  Serial.begin(9600);
  Serial.print("tL is: ");
  Serial.print("\t");
  Serial.println(tL);
  Serial.print("tH is: ");
  Serial.print("\t");
  Serial.println(tH);
  Serial.print("temp(C)");
  Serial.print("\t");
  Serial.println("on/off");
  Serial.println("________________");
  Serial.println("Início das leituras: ");
}

void loop(){
   // ---------------------------------------------------------------------------
  int acc = analogRead( 0 ); 
  delay( 100 );

  float tempC = 1 / (log(1 / (1023. / acc - 1)) / BETA + 1.0 / 298.15) - 273.15;

  if ( tempC < tL ){
    digitalWrite( 13, HIGH );
    
    Serial.print( tempC );
    Serial.print( "\t" );
    Serial.println( "1" );
    
    delay( 100 );
  }
  else{
    digitalWrite( 13, LOW );

    Serial.print( tempC );
    Serial.print( "\t" );
    Serial.println( "0" );

    delay( 100 );
  }

  lcd.setCursor( 0, 1 ); // linha 2, coluna 1
  lcd.print( tempC );

  // ---------------------------------------------------------------------------
  button6state = digitalRead( button6 );
  if ( button6state == HIGH ){
    tL = tL + 0.5;
    tH = tH + 0.5;
    
    lcd.setCursor(0,0);
    lcd.print(tL);
    lcd.print(" to ");
    lcd.print(tH);

    delay( 500 );
  }

  button7state = digitalRead( button7 );
  if ( button7state == HIGH ){
    tL = tL - 0.5;
    tH = tH - 0.5;
    
    lcd.setCursor(0,0);
    lcd.print(tL);
    lcd.print(" to ");
    lcd.print(tH);

    delay( 500 );
  }
  digitalWrite( button6, LOW );
  digitalWrite( button7, LOW );
}