Car Steering Wheel Control Unit with Arduino

/*this car steering wheel audio control buttons is programmed as universal circuit.
 * This can be used to Volume up and down and, to back and next button. The both rotary encoder 
 * swiches are recommended for that purposes. and also more 2 switches are with the rotary encoders.
 * 
 * Programmed by : BMIAK Basnayaka
 * for SetNFix Youtube channel
 * web : http://www.setnfix.com
 * date : 08.06.2021
 * Video Link https://youtu.be/m4KO8INEGUo
 */





//Volume Controler
int testPin=A0;
int volOne = A2;
int volTwo = A1;
 int directionV=0;
 int counterV = 0; 
 int currentStateCLKV;
 int previousStateCLKV; 

//Next and previous Button
#define nextOne A4
#define nextTwo  A3
 int counterN = 0; 
 int currentStateCLKN;
 int previousStateCLKN;

int progSwitch = A5;
int progData=0;

int volUp = 12;
int volDown = 11;
int back = 10;
int next = 9;

int delayMe =0; // Time need to click a button to activate 1000 = 1 second
int delayBtn = 2000; // Time need to click a button to prgramme the buttons 1000 = 1 second



void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);

pinMode(volOne,INPUT);
pinMode(volTwo, INPUT);
pinMode(nextOne,INPUT);
pinMode(nextTwo,INPUT);
pinMode(progSwitch,INPUT);
pinMode(volUp,OUTPUT);
pinMode(volDown,OUTPUT);
pinMode(back,OUTPUT);
pinMode(next,OUTPUT);
pinMode(testPin,OUTPUT);

  previousStateCLKV = digitalRead(volOne);
  previousStateCLKN = digitalRead(nextOne);
}

void loop() {


progData = analogRead(progSwitch);
delayMe = map(progData,0,1023,200,2000);

//Serial.println(delayMe);
volumeControler();
nextPrevious();





//
//delay(1000);

}

  
void volumeControler(){
  //Volume Controler
// Read the current state of inputCLK
currentStateCLKV = digitalRead(volOne);

//Serial.println(currentStateCLKV);

   // If the previous and the current state of the inputCLK are different then a pulse has occured
   if ((currentStateCLKV == LOW)&&(previousStateCLKV==HIGH)){ 
       
//Serial.println(currentStateCLKV);
     // If the inputDT state is different than the inputCLK state then 
     // the encoder is rotating counterclockwise
     if (digitalRead(volTwo)==LOW) { 
           
        digitalWrite(volDown,HIGH);
        analogWrite(testPin,10);
        Serial.println("DOWN");
        delay(delayMe);
        digitalWrite(volDown,LOW);
        analogWrite(testPin,0);
       //previousStateCLKV = currentStateCLKV; 
       
     } else {
      
       // Encoder is rotating clockwise
        digitalWrite(volUp,HIGH);
        analogWrite(testPin,20);
        Serial.println("UP");
        delay(delayMe);
        digitalWrite(volUp,LOW);
        analogWrite(testPin,0);
      // previousStateCLKV = currentStateCLKV; 
     }
//Serial.println(counterV);
   } 
   // Update previousStateCLK with the current state
   previousStateCLKV = currentStateCLKV; 


/*if (directionV == 1){
digitalWrite(volDown,HIGH);
Serial.println("DOWN");
delay(delayMe);
digitalWrite(volDown,LOW);directionV =0;}

if (directionV == 2){
digitalWrite(volUp,HIGH);
Serial.println("UP");
delay(delayMe);
digitalWrite(volUp,LOW);directionV =0;}
*/



}

void nextPrevious(){

// Read the current state of inputCLK
   currentStateCLKN = digitalRead(nextOne);
    
   // If the previous and the current state of the inputCLK are different then a pulse has occured
   if ((currentStateCLKN==LOW) && (previousStateCLKN==HIGH)){ 
       
     // If the inputDT state is different than the inputCLK state then 
     // the encoder is rotating counterclockwise
     if (digitalRead(nextTwo) ==LOW) { 
       counterN --;
        digitalWrite(next,HIGH);
        analogWrite(testPin,30);
        Serial.println("BACK");
        delay(delayMe);
        analogWrite(testPin,0);
        digitalWrite(next,LOW);
       
       
     } else {
       // Encoder is rotating clockwise
       counterN ++;
        digitalWrite(back,HIGH);
        Serial.println("NEXT");
        analogWrite(testPin,40);
        delay(delayMe);
        digitalWrite(back,LOW);
        analogWrite(testPin,0);
       
     }

   } 
   // Update previousStateCLK with the current state
   previousStateCLKN = currentStateCLKN; 
 }