quadrature encoder -> servo

quadrature rotary encoder

#include <Servo.h>

Servo MyServo;

void setup()
{
  // encoder pin on interrupt 0 (pin 2)
  attachInterrupt(0, encoderPinChangeA, CHANGE);
  // encoder pin on interrupt 1 (pin 3)
  attachInterrupt(1, encoderPinChangeB, CHANGE);
  encoder = 0;
  //attach servo to pin 9
  MyServo.attach(9)
}

void encoderPinChangeA() {
 if (digitalRead(encoder_a)==digitalRead(encoder_b)) {
  encoder--;
 }
 else{
  encoder++;
 }
}

void encoderPinChangeB() {
 if (digitalRead(encoder_a) != digitalRead(encoder_b)) {
  encoder--;
 }
 else {
  encoder++;
 }
}

void loop()
{
  MyServo.write(encoder)
  delay(10)
}