prisme-flow/nodes/bridge/pid/pidcontrol.js

prisme platform flow engine

/**
 * Created by prisme.io on 09/06/2017.
 */
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)
}