johnny-five/eg/motor-brake.js

The JavaScript Arduino Programming Framework.

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

board.on("ready", function() {
  var motor;
  /*
    Arduino Motor Shield R3
      Motor A
        pwm: 3
        dir: 12
        brake: 9

      Motor B
        pwm: 11
        dir: 13
        brake: 8

   */

  motor = new five.Motor({
    pins: {
      pwm: 3,
      dir: 12,
      brake: 9
    }
  });

  board.repl.inject({
    motor: motor
  });

  motor.on("start", function(err, timestamp) {
    console.log("start", timestamp);
  });

  motor.on("stop", function(err, timestamp) {
    console.log("automated stop on timer", timestamp);
  });

  motor.on("brake", function(err, timestamp) {
    console.log("automated brake on timer", timestamp);
  });

  motor.on("forward", function(err, timestamp) {
    console.log("forward", timestamp);

    // demonstrate switching to reverse after 5 seconds
    board.wait(5000, function() {
      motor.reverse(150);
    });
  });

  motor.on("reverse", function(err, timestamp) {
    console.log("reverse", timestamp);

    // demonstrate stopping after 5 seconds
    board.wait(5000, function() {

      // Apply the brake for 500ms and call stop()
      motor.brake(500);
    });
  });

  // set the motor going forward full speed
  motor.forward(255);
});