node-red-contrib-tinkerforge/bricklets/AnalogOut.js

Node-RED nodes to access Tinkerforge sensors

/**
 * Copyright 2017 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 Tinkerforge = require('tinkerforge');
var devices = require('../lib/devices');

module.exports = function(RED) {
    "use strict";
	function tinkerForgeAnalogOut(n) {
        RED.nodes.createNode(this,n);
        this.device = n.device;
        this.sensor = n.sensor;
        this.name = n.name;
        var node = this;

        node.ipcon = new Tinkerforge.IPConnection(); //devices[this.device].ipcon;
        node.ipcon.setAutoReconnect(true);
        var devs = devices.getDevices();
        node.ipcon.connect(devs[node.device].host, devs[node.device].port,function(error){
            if(error) {
                node.warn("couldn't connect");
            }
        });

        node.ipcon.on(Tinkerforge.IPConnection.CALLBACK_CONNECTED,
        function(connectReason) {
            node.ao = new Tinkerforge.BrickletAnalogOutV2(node.sensor, node.ipcon);
        });


        node.on('input', function(msg){
            if(node.ao) {
                if (typeof msg.payload === 'number') {
                    if (msg.payload >=0 && msg.payload <= 12) {
                        var v = Math.round(msg.payload * 1000);
                        node.ao.setOutputVoltage(v);
                    }
                } else {
                    node.error("Payload not a number");
                }
            }
        });


        node.on('close',function() {
            node.ipcon.disconnect();
        });
    }

    RED.nodes.registerType('TinkerForge AnalogOut', tinkerForgeAnalogOut);
}