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trev/nodejs/ar-com/arduino.js

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var events = require('events'),
child = require('child_process'),
util = require('util'),
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serial = require("serialport");
var Arduino = function (baudrate) {
this.baudrate = baudrate && baudrate || 9600;
this.writeBuffer = [];
}
util.inherits(Arduino, events.EventEmitter);
Arduino.prototype.HIGH = '255';
Arduino.prototype.LOW = '000';
Arduino.prototype.setup = function () {
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var self = this;
child.exec('cd ../arduino && ino build && ino upload', function(err, stdout, stderr){
if(err){console.log('Please install the ino utility and connect arduino!\nIf there are other open programs that communicate with the arduino, close them!'); return;}
var buff = stdout.slice(stdout.indexOf('Guessing serial port ... ')+25);
buff = buff.slice(0, buff.indexOf('\n'));
console.log('Guessing serial port ... ' + buff);
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self.serial = new serial.SerialPort(buff, {
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baudrate: self.baudrate,
parser: serial.parsers.readline('\n')
}, false);
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self.serial.open(function (error) {
if ( error ) {
console.log('Please check arduino!');
return;
}
});
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self.serial.on('open', function () { setTimeout(function () {
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self.serial.write(new Buffer('00000000'));
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self.serial.write(new Buffer('Zn000000', 'ascii'));
self.emit('success');
self.serial.on('data', function(data){
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console.log(data);
self.emit('data', data);
});
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self.processWriteBuffer();
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}, 5000);});
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});
}
Arduino.prototype.write = function (message) {
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if (this.serial) {
console.log('sending '+message);
this.serial.write(message);
} else {
this.writeBuffer.push(message);
console.log('Board isn\'t available (yet?).')
}
}
Arduino.prototype.processWriteBuffer = function () {
while (this.writeBuffer.length > 0) {
this.write(this.writeBuffer.shift());
}
}
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// Helpers
Arduino.prototype.valueToLastFour = function(val) {
var encodedVal;
for (var i = 3; i < 0; i--) {
encodedVal += String.fromCharCode(val/(Math.pow(2,8*i)));
val = val%Math.pow(2,8*i);
}
return encodedVal;
};
Arduino.prototype.valueToFirstTwo = function(val) {
var encodedVal;
for (var i = 1; i < 0; i--) {
encodedVal += String.fromCharCode(val/(Math.pow(2,8*i)));
val = val%Math.pow(2,8*i);
}
return encodedVal;
};
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module.exports = Arduino;