1.2.56. fejezet, Forgó jeladó (rotary encoder)

int encoderPin1 = 2;
int encoderPin2 = 3;
int encoderSwitchPin = 4; //push button switch
 
volatile int lastEncoded = 0;
volatile long encoderValue = 0;
 
long lastencoderValue = 0;
 
int lastMSB = 0;
int lastLSB = 0;
 
void setup() {
  Serial.begin (9600);
 
  pinMode(encoderPin1, INPUT);
  pinMode(encoderPin2, INPUT);
 
  pinMode(encoderSwitchPin, INPUT);
 
  digitalWrite(encoderPin1, HIGH); //turn pullup resistor on
  digitalWrite(encoderPin2, HIGH); //turn pullup resistor on
 
  digitalWrite(encoderSwitchPin, HIGH); //turn pullup resistor on
 
  //call updateEncoder() when any high/low changed seen
  //on interrupt 0 (pin 2), or interrupt 1 (pin 3)
  attachInterrupt(0, updateEncoder, CHANGE);
  attachInterrupt(1, updateEncoder, CHANGE);
 
}
 
void loop(){
//Do stuff here
  if(digitalRead(encoderSwitchPin)){
 
  }else{
    Serial.println("Pushed");
  }
  Serial.println(encoderValue);
  delay(1000); //just here to slow down the output, and show it will work even during a delay
}
 
void updateEncoder(){
  int MSB = digitalRead(encoderPin1); //MSB = most significant bit
  int LSB = digitalRead(encoderPin2); //LSB = least significant bit
  int encoded = (MSB << 1) |LSB;
  int sum = (lastEncoded << 2) | encoded;
  if(sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++;
  if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue --;
  lastEncoded = encoded;
}