Interfacing to Adafruit fingerprint sensor

And here is some example using the library :
Async function series (Thanks Gordon) :

function series(arr,done) {
  var i=0;
  function next(err, result) {
    if (((err!==undefined) && (err!==null)) || i>=arr.length)
      done(err, result);
    else
      setTimeout(function() {arr[i++](next);}, 0);
  }
  next();
}

Enrollment example :

function enrollFingerprint(id) {
  series([
    function(done) {
      getImage(function(err, result) {
        var error = getErrorCode(result.responseCode);
        if(error === null && ((result.responseCode & 0xFF) == C.FINGERPRINT_OK)) 
            console.log("Image taken");
        done(error);
      });
    },
    function(done) {
      image2Tz(1, function(err, result) {
        var error = getErrorCode(result.responseCode);
        if(error === null && ((result.responseCode & 0xFF) == C.FINGERPRINT_OK)) 
            console.log("Image converted");
        done(error);
      });
    },
    function(done) {
      console.log('Remove finger');
      setTimeout(function(e) { console.log(e.time); done(null); }, 2000);
    },
    function(done) {
      console.log('Place same finger again');
      setTimeout(function(e) { console.log(e.time); done(null);}, 2000);
    },
    function(done) {
      getImage(function(err, result) {
        var error = getErrorCode(result.responseCode);
        if(error === null && ((result.responseCode & 0xFF) == C.FINGERPRINT_OK)) 
            console.log("Image taken");
        done(error);
      });
    },
    function(done) {
      image2Tz(2, function(err, result) {
        var error = getErrorCode(result.responseCode);
        if(error === null && ((result.responseCode & 0xFF) == C.FINGERPRINT_OK)) 
            console.log("Image converted");
        done(error);
      });
    },
    function(done) {
      createModel(function(err, result) {
        var error = getErrorCode(result.responseCode);
        if(error === null && ((result.responseCode & 0xFF) == C.FINGERPRINT_OK)) 
            console.log("Prints matched");
        done(error);
      });
    },
    function(done) {
      storeModel(id, function(err, result) {
        var error = getErrorCode(result.responseCode);
        if(error === null && ((result.responseCode & 0xFF) == C.FINGERPRINT_OK)) 
            console.log("Stored");
        done(error);
      });
    }
  ], function (err, result) {
    console.log(err);
  });
}

connect(Serial4);

enrollFingerprint(8);

Recogniton example :

function getFingerprintIDez(callback) {
  series([
      function(done) {
        getImage(function(err, result) {
          var error = getErrorCode(result.responseCode);
          done(error);
        });
      },
      function(done) {
        image2Tz(1, function(err, result) {
          var error = getErrorCode(result.responseCode);
          done(error);
        });
      },
      function(done) {
        fingerFastSearch(function(err, result) {
          var error = getErrorCode(result.responseCode);
          done(error, result);
        });
      }
  ], function(err, result) {
       callback(err, result);
    }
  );
}

connect(Serial4);

getFingerprintIDez(function(err, result) {
  console.log('final');
  console.log('Error : ' + err);
  if(err === null) {
  console.log(result);
    console.log('#ID : ' + result.fingerID);
    console.log('level : ' + result.confidence); 
  }
});