int ENCODER_CLK = 2;
int ENCODER_DT=3;
int counter = 0;
#include <Servo.h>
Servo myservo;
void setup() {
  Serial.begin(115200);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  myservo.attach(9);
  myservo.write(counter);
}
int lastClk = HIGH;
void loop() {
  int newClk = digitalRead(ENCODER_CLK);
  if (newClk != lastClk) {
    // There was a change on the CLK pin
    lastClk = newClk;
    int dtValue = digitalRead(ENCODER_DT);
    if (newClk == LOW && dtValue == HIGH) {
      counter++;
      if (counter > 180) counter = 180;
      myservo.write(counter);
      Serial.println(counter); 
      //delay(50);
    }
    if (newClk == LOW && dtValue == LOW) {
      counter--;
      if (counter < 0) counter = 0;
      myservo.write(counter);
      Serial.println(counter); 
      //delay(50);
    }
  }
}