43 lines
1.3 KiB
JavaScript
43 lines
1.3 KiB
JavaScript
/**
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* Copyright 2015 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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var m = require('mraa');
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function gpioAin(n) {
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RED.nodes.createNode(this, n);
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this.pin = n.pin;
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this.interval = n.interval;
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this.x = new m.Aio(parseInt(this.pin));
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this.board = m.getPlatformName();
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var node = this;
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var msg = { topic:node.board+"/A"+node.pin };
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var old = -99999;
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this.timer = setInterval(function() {
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msg.payload = node.x.read();
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if (msg.payload !== old) {
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node.send(msg);
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old = msg.payload;
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}
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}, node.interval);
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this.on('close', function() {
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clearInterval(this.timer);
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});
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}
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RED.nodes.registerType("mraa-gpio-ain", gpioAin);
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}
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