#define ENCODER_CLK 5
#define ENCODER_DT  6
#define ENCODER_SW 7

int position=0;
int lastClk = HIGH;

void encoder_position(int newClk);

void setup() {
  Serial.begin(115200);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_DT, INPUT_PULLUP);
}

void loop() {
  encoder_position(digitalRead(ENCODER_CLK));
  if(position>11){
    position=0;
  }
  if(position<0){
    position=10;
  }
  if(digitalRead(ENCODER_SW)){
    position=0;
  }
  Serial.println("position: "+String(position));
}

void encoder_position(int newClk)
{
  if (newClk != lastClk) {
    // There was a change on the CLK pin
    lastClk = newClk;
    int dtValue = digitalRead(ENCODER_DT);
    if (newClk == LOW && dtValue == HIGH) {
      Serial.println("Rotated clockwise ⏩");
      position+=1;
    }
    if (newClk == LOW && dtValue == LOW) {
      Serial.println("Rotated counterclockwise ⏪");
      position-=1;
    }
  }
}