node-red-contrib-minelert-universal-io/level-to-ma.js

Node-RED nodes for Universal IO Gateway and I/O Modules

const { EventBus, logInfo, Utils } = require('@minelert-smartlink/common');

const {toMeters, convertLevelToMilliAmps} = require('./utils/smartlink-utils')

module.exports = function(RED) {
    function LevelToMaNode(config) {
      RED.nodes.createNode(this, config);
      const node = this;
  
      node.mode = config.mode || 'distance'; // 'distance' or 'level'
      node.min = parseFloat(config.min) || 0;
      node.max = parseFloat(config.max) || 1;

      node.on('input', (msg, send, done) => {
        const tankHeight = RED.util.evaluateNodeProperty(config.tankHeight, config.tankHeightType || "str", this, msg);     
        const height = parseFloat(tankHeight);

        const value = msg.payload.value || null
        const unit = msg.payload.unit || 'm'

        const result = convertLevelToMilliAmps(value, unit, node.mode, node.min, node.max, height)

        if ('error' in result) {
          node.error(result.error)
          return
        }

        node.status({ fill: "green", shape: "dot", text: `${result.mA} mA` });

        send({payload: result});

        if (done) done();

      });
  
      node.on('close', () => {
        // Optionally perform cleanup
      });
    }
  
    RED.nodes.registerType("level-to-ma", LevelToMaNode);
  };