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node-red-nodes/hardware/intel/mraa-gpio-ain.js
2015-09-21 17:03:50 +01:00

43 lines
1.3 KiB
JavaScript

/**
* Copyright 2015 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.
**/
module.exports = function(RED) {
var m = require('mraa');
function gpioAin(n) {
RED.nodes.createNode(this, n);
this.pin = n.pin;
this.interval = n.interval;
this.x = new m.Aio(parseInt(this.pin));
this.board = m.getPlatformName();
var node = this;
var msg = { topic:node.board+"/A"+node.pin };
var old = -99999;
this.timer = setInterval(function() {
msg.payload = node.x.read();
if (msg.payload !== old) {
node.send(msg);
old = msg.payload;
}
}, node.interval);
this.on('close', function() {
clearInterval(this.timer);
});
}
RED.nodes.registerType("mraa-gpio-ain", gpioAin);
}