node-red-contrib-sensor-check

A Node-RED sensor plausibility monitor. Detects out-of-range values and communication timeouts, then outputs a fallback value and alarm signal.

Installation

npm install node-red-contrib-sensor-check

Inputs

• payload number: Current sensor value to check.
• acknowledge (optional) boolean: Acknowledge and reset the fault state.

Outputs

• Output 1 payload number: Original value when OK, fallback value when fault.
• Output 2 payload boolean: true = fault, false = OK. Includes msg.sensorCheck details.

Configuration

• Min / Max: Plausibility range - values outside trigger a fault.
• Fallback: Value sent on Output 1 during a fault.
• Use Fallback: If unchecked, Output 1 is null during faults.
• Timeout: Seconds without a message before timeout fault. 0 = disabled.
• Hysteresis: Band applied when leaving fault state to prevent flickering.

Tips

• faultType in msg.sensorCheck: "outOfRange" or "timeout".
• Use msg.acknowledge = true to reset after intervention.
• Combine Output 2 with notification nodes for alerting.

License

MIT (c) sr.rpo