====== Cadran Téléphonique ======

==== Résumé ====

Le projet est d'interfacer un cadran téléphonique rotatif avec un shield mp3 d'arduino pour lancer des lectures de sample lorsqu'on compose un chiffre sur le cadran

====Visuel====

{{:projets:cablage-cadran.jpg?400}}
{{:projets:dial.jpg?400}}

----

==== Code arduino ====
<code>
int needToPrint = 0;
int count;
int in = 2;
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(in, INPUT);
}

void loop()
{
  int reading = digitalRead(in);

  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;
    }
  }

  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;
}
</code>

----

==== Ressources ====

  *[[http://www.instructables.com/id/Interface-a-rotary-phone-dial-to-an-Arduino/|Lien vers page instructables]] //(en anglais)//
  *[[https://learn.sparkfun.com/tutorials/mp3-player-shield-hookup|Lien vers page Sparkfun]] //(en anglais)//

----

//Projet par Damien & Mathieu//