//Encoder KY-040
/*
#include <LiquidCrystal_I2C.h>
#define CLK 2
#define DT 3
#define SW 4

/*PINOS
  ENCODER:
  2 = CLK (Clock)
  3 = DT (Digital)
  4 = SW (Switch)

  DISPLAY LCD
  A5 = SCL
  A4 = SDA
*/

/*
int coluna = 20;
int linha = 4;
const int endereco = 0x27;

LiquidCrystal_I2C lcd(endereco, coluna, linha);
*/


// Initialization of the needed variables<br />
int Counter = 0;
boolean Richtung;
int Pin_clk_Letzter;
int Pin_clk_Aktuell;
// Definition of the input-pins
int pin_clk = 2;
int pin_dt = 3;
int button_pin = 4;

void setup()
{
  // Initialization of the input-pins...
  pinMode (pin_clk,INPUT);
  pinMode (pin_dt,INPUT);
  pinMode (button_pin,INPUT);
  // ...and activating of their pull up resistors
  digitalWrite(pin_clk, true);
  digitalWrite(pin_dt, true);
  digitalWrite(button_pin, true);

  // Initial reading of the Pin_CLK
  Pin_clk_Letzter = digitalRead(pin_clk);
  Serial.begin(115200);
}

// The program checks, which of the status pins have changed first
void loop()
{
  // Reading of the current status
  Pin_clk_Aktuell = digitalRead(pin_clk);
  // Check for a Change
  if(Pin_clk_Aktuell != Pin_clk_Letzter)
  {
    if(digitalRead(pin_dt) != Pin_clk_Aktuell)
    {
      // Pin_CLK has changed first
      Counter ++;
      Richtung = true;
    }

    else
    {
      // Else Pin_DT changed first
      Richtung = false;
      Counter--;
    }

    Serial.println ("Rotation detected: ");
    Serial.println ("Rotation detected: ");
    Serial.print ("Rotational direction: ");

    if(Richtung)
    {
      Serial.println ("Clockwise");
    }

    else
    {
      Serial.println("Counterclockwise");
    }

    Serial.print("Current position: ");
    Serial.println(Counter);
    Serial.println("------------------------------");
  }

  // Preparation for the next run:
  // The current value will be the last value for the next run.
  Pin_clk_Letzter = Pin_clk_Aktuell;
  // Reset funciton to save the current position
  if (!digitalRead(button_pin) && Counter!=0)
  {
    Counter = 0;
    Serial.println("Position resetted");
  }
}