matt.ino

int rotaryPin = 2;
int hookswitchPin = 3;

int needToPrint = 0;
int count;
int lastState = LOW;
int trueState = LOW;
long lastStateChangeTime = 0;
int cleared = 0;

// constants
int dialHasFinishedRotatingAfterMs = 100;
int debounceDelay = 10;

void setup() {
  Serial.begin(9600);
  pinMode(rotaryPin, INPUT);
  pinMode(hookswitchPin, INPUT);
}

boolean isIntroPlayed = false;
boolean isReadyForNumber = false;
boolean hasReceivedNumber = false;
int receivedNumber = 0;

void loop() {
  readNumbers();

  // User lifts receiver, hears intro once
  if(digitalRead(hookswitchPin) == LOW && !isIntroPlayed) {
    // INSERT THE CODE TO PLAY THE INTRO HERE 
    delay(100); // CHANGE DELAY TO THE LENGTH OF THE INTRO IN MILISECONDS

    // Set the intro as played
    isIntroPlayed = true;
  } 
  else {
    // Reset everything
    isIntroPlayed = false;
  }

  // Do this after the intro has played
  if(digitalRead(hookswitchPin) == LOW && isIntroPlayed) {
    // Do this once after a number has been received
    if(hasReceivedNumber) {
      hasReceivedNumber = false;

      // Do different things depending on nuber
      switch(receivedNumber) {
      case 0:
        // INSERT CODE HERE FOR EACH NUMBER etc
        break;
      case 1:
        break;
      case 2:
        break;
      case 3:
        break;
      case 4:
        break;
      case 5:
        break;
      case 6:
        break;
      case 7:
        break;
      case 8:
        break;
      case 9:
        break;
      }
    }
  }
}

void readNumbers() {
  int reading = digitalRead(rotaryPin);

  if ((millis() - lastStateChangeTime) > dialHasFinishedRotatingAfterMs) {
    // the dial isn't being dialed, or has just finished being dialed.
    if (needToPrint) {
      // if it's only just finished being dialed, we need to send the number down the serial
      // line and reset the count. We mod the count by 10 because '0' will send 10 pulses.
      Serial.print(count % 10, DEC);
      needToPrint = 0;
      count = 0;
      cleared = 0;
      receivedNumber = count % 10;
      hasReceivedNumber = true;
    }
  } 

  if (reading != lastState) {
    lastStateChangeTime = millis();
  }

  if ((millis() - lastStateChangeTime) > debounceDelay) {
    // debounce - this happens once it's stablized
    if (reading != trueState) {
      // this means that the switch has either just gone from closed->open or vice versa.
      trueState = reading;
      if (trueState == HIGH) {
        // increment the count of pulses if it's gone high.
        count++; 
        needToPrint = 1; // we'll need to print this number (once the dial has finished rotating)
      } 
    }
  }

  lastState = reading;
}