node-red-contrib-lookup-table

Piecewise linear interpolation lookup table for Node-RED. Maps an input value to an output value using configurable X/Y point pairs. Values outside the defined range are clamped to the nearest endpoint.

Install

npm install node-red-contrib-lookup-table

Usage

Send a numeric value as msg.payload. The node interpolates between the configured points.

| msg | Effect | |-----|--------| | msg.payload = 50 | Input value to look up |

Output

msg.payload = interpolated output value.

{
  "lookupTable": {
    "input": 50,
    "output": 60.0,
    "interpolated": true,
    "clamped": false,
    "lowerPoint": { "x": 0, "y": 10 },
    "upperPoint": { "x": 100, "y": 90 }
  }
}

Points are configured visually in the node editor as X/Y pairs and sorted automatically by X.

License

MIT — sr.rpo