upm/examples/javascript/l298.js

/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */
/*
* Author: Zion Orent <zorent@ics.com>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

var HBridge_lib = require('jsupm_l298');

// Instantiate one of the 2 possible DC motors on a L298 Dual
// H-Bridge.  For controlling a stepper motor, see the l298-stepper
// example.
var myHBridge_obj = new HBridge_lib.L298(3, 4, 7);

/*****************************
 * Instantiate H-bridge object
******************************/
myHBridge_obj.goForward = function()
{
	console.log("Starting motor at 50% for 3 seconds...");
	myHBridge_obj.setSpeed(50);
	myHBridge_obj.setDirection(HBridge_lib.L298.DIR_CW);
	myHBridge_obj.enable(true);
};

myHBridge_obj.reverseDirection = function()
{
	console.log("Reversing direction...");
	myHBridge_obj.setDirection(HBridge_lib.L298.DIR_NONE); // fast stop
	myHBridge_obj.setDirection(HBridge_lib.L298.DIR_CCW);
};

myHBridge_obj.stop = function()
{
	myHBridge_obj.setSpeed(0);
	myHBridge_obj.enable(false);
};

myHBridge_obj.quit = function()
{
	myHBridge_obj = null;
	HBridge_lib.cleanUp();
	HBridge_lib = null;
	console.log("Exiting");
	process.exit(0);
};


/************************
 * Run H-bridge!
*************************/
myHBridge_obj.goForward();
setTimeout(myHBridge_obj.reverseDirection, 3000);
setTimeout(function()
{
	myHBridge_obj.stop();
	myHBridge_obj.quit();
}, 6000);