/* Arduino New Rotary Encoder Debounce
 
Created by Yvan / https://Brainy-Bits.com

This code is in the public domain...

You can: copy it, use it, modify it, share it or just plain ignore it!
Thx!

*/

// Rotary Encoder Module connections
const int PinSW=3;   // Rotary Encoder Switch
const int PinDT=4;    // DATA signal
const int PinCLK=2;    // CLOCK signal

// Variables to debounce Rotary Encoder
long TimeOfLastDebounce = 0;
int DelayofDebounce = 20.00;

// Store previous Pins state
int PreviousCLK;   
int PreviousDATA;

int displaycounter=0; // Store current counter value

// Library used for LED MATRIX 8x8
//#include <MD_Parola.h>
//#include <MD_MAX72xx.h>
//#include <SPI.h>

//#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
/*  PAROLA_HW,    ///< Use the Parola style hardware modules.
    GENERIC_HW,   ///< Use 'generic' style hardware modules commonly available.
    ICSTATION_HW, ///< Use ICStation style hardware module.
    FC16_HW       ///< Use FC-16 style hardware module.
*/

// 8x8 LED Matrix connections
//#define MAX_DEVICES 2
//#define CLK_PIN   13
//#define DATA_PIN  11
//#define CS_PIN    10

// Hardware SPI connection
//MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);



void setup() {
  // Put current pins state in variables
  Serial.begin(9600);
  PreviousCLK=digitalRead(PinCLK);
  PreviousDATA=digitalRead(PinDT);

  // Set the Switch pin to use Arduino PULLUP resistors
  pinMode(PinSW, INPUT_PULLUP);

  // Start and setup the LED MATRIX at startup
  //P.begin();
  //P.setTextAlignment(PA_RIGHT);
  //P.print(displaycounter);

}
void loop() {
  // If enough time has passed check the rotary encoder
  if ((millis() - TimeOfLastDebounce) > DelayofDebounce) {
    
    check_rotary();  // Rotary Encoder check routine below
    
    PreviousCLK=digitalRead(PinCLK);
    PreviousDATA=digitalRead(PinDT);
    
    TimeOfLastDebounce=millis();  // Set variable to current millis() timer
  }
  
  // Check if Rotary Encoder switch was pressed
  if (digitalRead(PinSW) == LOW) {
    displaycounter=0;  // Reset counter to zero
    //P.print(displaycounter);

  }
}


// Check if Rotary Encoder was moved
void check_rotary() {

 if ((PreviousCLK == 0) && (PreviousDATA == 1)) {
    if ((digitalRead(PinCLK) == 1) && (digitalRead(PinDT) == 0)) {
      displaycounter++;
      //P.print(displaycounter);
      Serial.println(displaycounter);
    }
    if ((digitalRead(PinCLK) == 1) && (digitalRead(PinDT) == 1)) {
      displaycounter--;
      //P.print(displaycounter);
            Serial.println(displaycounter);

    }
  }

if ((PreviousCLK == 1) && (PreviousDATA == 0)) {
    if ((digitalRead(PinCLK) == 0) && (digitalRead(PinDT) == 1)) {
      displaycounter++;
      //P.print(displaycounter);
            Serial.println(displaycounter);

    }
    if ((digitalRead(PinCLK) == 0) && (digitalRead(PinDT) == 0)) {
      displaycounter--;
      //P.print(displaycounter);
      Serial.println(displaycounter);

    }
  }

if ((PreviousCLK == 1) && (PreviousDATA == 1)) {
    if ((digitalRead(PinCLK) == 0) && (digitalRead(PinDT) == 1)) {
      displaycounter++;
      //P.print(displaycounter);
      Serial.println(displaycounter);

    }
    if ((digitalRead(PinCLK) == 0) && (digitalRead(PinDT) == 0)) {
      displaycounter--;
      //P.print(displaycounter);
      Serial.println(displaycounter);

    }
  }  

if ((PreviousCLK == 0) && (PreviousDATA == 0)) {
    if ((digitalRead(PinCLK) == 1) && (digitalRead(PinDT) == 0)) {
      displaycounter++;
      //P.print(displaycounter);
      Serial.println(displaycounter);

    }
    if ((digitalRead(PinCLK) == 1) && (digitalRead(PinDT) == 1)) {
      displaycounter--;
        //  P.print(displaycounter);
      Serial.println(displaycounter);

    }
  }            
 }