Rotary Encoder Module

The rotary encoder module is an angular measuring device. It is used to precisely measure the 24-steps rotation of knob that can turn infinitely (with no end stop like a potentiometer has). The rotary encoder module also has a pushbutton when you press on the axis (like the ones used for navigation on many music controllers).

Arduino sketch:

int val;
int encoder0PinA = 3;
int encoder0PinB = 4;
int encoder0Pos = 0;
int encoder0PinALast = LOW;
int n = LOW;

void setup()
{

pinMode (encoder0PinA,INPUT);
pinMode (encoder0PinB,INPUT);
Serial.begin (9600);

}

void loop()
{
n = digitalRead(encoder0PinA);
if ((encoder0PinALast == LOW) && (n == HIGH)) {

if (digitalRead(encoder0PinB) == LOW)

{

  encoder0Pos--;

  }
  else {
        encoder0Pos++;
  }
Serial.print (encoder0Pos);
Serial.print ("/");
}
encoder0PinALast = n;
}