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node-red-nodes/hardware/Pi/78-ledborg.js

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/**
* Copyright 2013 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var RED = require(process.env.NODE_RED_HOME+"/red/red");
var util = require('util');
var fs = require('fs');
// check if /dev/ledborg exists - if not then don't even show the node.
if (!fs.existsSync("/dev/ledborg")) {
util.log("[78-ledborg.js] Warning: PiBorg hardware : LedBorg not found");
return;
}
function LedBorgNode(n) {
RED.nodes.createNode(this,n);
var p1 = /[0-2][0-2][0-2]/
var p2 = /^\#[A-Fa-f0-9]{6}$/
var node = this;
this.on("input", function(msg) {
if (p1.test(msg.payload)) {
fs.writeFile('/dev/ledborg', msg.payload, function (err) {
if (err) node.warn(msg.payload+" : No LedBorg found");
});
}
if (p2.test(msg.payload)) {
var r = Math.floor(parseInt(msg.payload.slice(1,3),16)/88).toString();
var g = Math.floor(parseInt(msg.payload.slice(3,5),16)/88).toString();
var b = Math.floor(parseInt(msg.payload.slice(5),16)/88).toString();
fs.writeFile('/dev/ledborg', r+g+b, function (err) {
if (err) node.warn(r+g+b+" : No LedBorg found");
});
}
else {
node.warn("Invalid LedBorg colour code");
}
});
}
RED.nodes.registerType("ledborg",LedBorgNode);