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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

cablage-cadran.jpg


Code arduino

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;
}

Ressources

Lien vers page instructables (en anglais)


Projet par Damien