ribbons.actuators.led/lib/led.js

LED as a Ribbons actuator.

var Actuator = require('ribbons.actuator');
var util = require('util');

function Led (options) {
  Actuator.call(this, options);
  options = options || {};
  this.pin = options.pin;
  this.name = options.name || 'led';
}
util.inherits(Led, Actuator);

Led.prototype.start = function() {
  this.platformLed = new this.platform.Pin(this.pin);
};
Led.prototype.on = function() {
  this.platformLed.on();
  this.info('on');
};
Led.prototype.off = function() {
  this.platformLed.off();
  this.info('off');
};
Led.prototype.pulse = function(duration) {
  // turn off old pulse before starting new
  this.stopPulse();
    
  var duration = duration || 500;
  this.info('pulse', 'duration ' + duration);
  this.on();
  var self = this;
  this.timeoutId = setTimeout(function ledOff () {
    self.off();
  }, duration);
};
Led.prototype.stopPulse = function () {
  this.info('stopPulse');
  clearTimeout(this.timeoutId);
  this.off();
};
Led.prototype.blink = function(freq) {
  // in case it's a new frequency
  // turn off old blinks before starting new 
  this.stopBlink();

  var frequency = freq || 1;

  this.info('blink', 'frequency ' + frequency);

  var interval = 1000 / frequency;
  var self = this;
  this.intervalId = setInterval(function ledPulse () {
    self.pulse(interval / 2);
  }, interval);
};
Led.prototype.stopBlink = function() {
  this.info('stopBlink');
  clearInterval(this.intervalId);
  this.off();
};

module.exports = Led;