#define clk 32 //Pin A
#define dt 33  //Pin B
#define sw 25  //Push Button
long counter = 0;
void setup() {
  Serial.begin(115200);
  pinMode(clk, INPUT_PULLUP);
  pinMode(dt, INPUT_PULLUP);
  pinMode(sw, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(clk), read_encoder, FALLING);
}
void read_encoder() {
  double dt_val = digitalRead(dt);
  if (dt_val == 1) counter++;
  if (dt_val == 0) counter--;
}
long Counter() {
  int res;
  noInterrupts();
  res = counter;
  interrupts();
  return res;
}
void reset() {
  noInterrupts();
  counter = 0;
  interrupts();
}
void loop() {
  Serial.print("Counter = ");
  Serial.println(Counter());
  if (!digitalRead(sw) == 1) reset();
}