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node-red-nodes/function/PID/pidcontrol.js
2015-04-23 14:31:08 +01:00

49 lines
1.7 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) {
"use strict";
var Controller = require('node-pid-controller');
function PIDcontrolNode(n) {
RED.nodes.createNode(this,n);
this.target = n.target;
this.kp = n.kp;
this.ki = n.ki;
this.kd = n.kd;
var node = this;
node.ctr = new Controller(node.kp, node.ki, node.kd);
node.ctr.setTarget(node.target);
this.status({fill:"blue",shape:"dot",text:"set point:"+node.target});
var tgt = node.target;
this.on("input",function(msg) {
if (msg.hasOwnProperty("setpoint")) {
tgt = Number(msg.setpoint);
node.ctr.setTarget(tgt);
this.status({fill:"blue",shape:"dot",text:"set point:"+tgt});
}
else if (!isNaN(msg.payload)) {
msg.payload = node.ctr.update(Number(msg.payload));
msg.topic = "pid";
node.send(msg);
}
else { node.warn("Non numeric input"); }
});
}
RED.nodes.registerType("PID control",PIDcontrolNode);
}