#define a 0
#define b 1
#define click 2

int state;
int lastState;
int counter = 0;

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

  lastState = digitalRead(a);
}

void loop() {
  // put your main code here, to run repeatedly:
  state = digitalRead(a);
 
  // Serial.println("Last State:");
  // Serial.println(lastState);
  // Serial.println("State:");
  // Serial.println(state);


  if(state != lastState){
    if(digitalRead(b) != state){
      counter++;
    }
    else{
    counter--;
    }

    Serial.println("Position:");
    Serial.println(counter);
  }

  lastState = state;

  delay(5);
  
}