johnny-five/eg/accelerometer-pan-tilt.js

Firmata based Arduino Programming Framework.

var five = require("../lib/johnny-five.js"),
    board;

board = new five.Board();

board.on("ready", function() {

  var range, pan, tilt, accel;

  range = [ 0, 170 ];

  // Servo to control panning
  pan = new five.Servo({
    pin: 9,
    range: range
  });

  // Servo to control tilt
  tilt = new five.Servo({
    pin: 10,
    range: range
  });

  // Accelerometer to control pan/tilt
  accel = new five.Accelerometer({
    pins: [ "A3", "A4", "A5" ],
    freq: 250
  });

  // Center all servos
  (five.Servos()).center();

  accel.on("acceleration", function( err, timestamp ) {
    // console.log( "acceleration", this.axis );

    tilt.move( Math.abs( Math.ceil(170 * this.pitch.toFixed(2)) - 180 ) );
    pan.move( Math.ceil(170 * this.roll.toFixed(2)) );

    // TODO: Math.abs(v - 180) as inversion function ?
  });
});