Rotary Encoder - Illuminated (Red/Green)

DOCUMENTS

ARDUINO SAMPLE CODE:

//From bildr article: http://bildr.org/2012/08/rotary-encoder-arduino/
//these pins can not be changed 2/3 are special pins
int encoderPin1 = 2;
int encoderPin2 = 3;
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);

    digitalWrite(encoderPin1, HIGH); //turn pullup resistor on
    digitalWrite(encoderPin2, 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
    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;
    //converting the 2 pin value to single number int sum = (lastEncoded << 2) | encoded; 
    //adding it to the previous encoded value if(sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++; if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue --; lastEncoded = encoded; 
    //store this value for next time 
}