node-red-contrib-arithmetic

A Node-RED node that performs arithmetic operations (+, -, x, /, %, ^) on two numeric inputs.

Installation

npm install node-red-contrib-arithmetic

Inputs

• payload number: Value for A or B (identified by msg.topic).
• topic string: Set to Topic A or Topic B name.
• operator (optional) string: Override operator: + - x / % ^
• reset (optional) boolean: Clear stored A and B values.

Outputs

• payload number: Result rounded to configured decimal places.
• arithmetic object: { a, b, operator, result, decimals }

Configuration

• Topic A/B: msg.topic identifiers (default: a / b).
• Operator: Arithmetic operator (default: +).
• Decimal Places: Output precision 0-10 (default: 2).

Tips

• Division and modulo by zero are blocked with a warning - no output sent.
• Output fires when both A and B are known.

License

MIT (c) sr.rpo