node-red-contrib-three-point

Three-point actuator controller for motorized mixing valves and dampers. Calculates open/close pulse duration based on the difference between setpoint and current position, with deadband and minimum pulse time.

Install

npm install node-red-contrib-three-point

Usage

Send target position (0–100%) as msg.payload.

| msg | Effect | |-----|--------| | msg.payload = 75 | Move valve towards 75% open | | msg.open = true | Full open command | | msg.close = true | Full close command | | msg.stop = true | Stop movement immediately | | msg.reset = true | Reset to initial position |

Output 1 — OPEN pulse

msg.payload = true while valve is opening, then false when pulse ends.

Output 2 — CLOSE pulse

msg.payload = true while valve is closing, then false when pulse ends.

{
  "threePoint": {
    "setpoint": 75,
    "position": 50,
    "difference": 25,
    "direction": "open",
    "pulseTime": 30.0,
    "runtime": 120,
    "deadband": 2,
    "moving": true
  }
}

License

MIT — sr.rpo