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Readme

node-red-contrib-clamp

Node-RED Clamp Node - limits values to a min/max range.

Features

Limits values to configured min/max range
Values below min are clipped to min
Values above max are clipped to max
Runtime overrides via msg properties
Configurable decimal places (0-10)

Behavior

Input < min → Output = min
Input > max → Output = max
Input in range → Output = input unchanged

Examples

min=0, max=100:

Input 120  → Output 100 (clamped)
Input -5   → Output 0   (clamped)
Input 42   → Output 42  (passthrough)

min=-10, max=10:

Input 15   → Output 10  (clamped)
Input -15  → Output -10 (clamped)
Input 0    → Output 0   (passthrough)

Configuration

Property	Description	Default
Min	Lower bound	0
Max	Upper bound	100
Decimals	Number of decimal places	2

Input

msg.payload - Numeric value to clamp

Runtime Overrides

Property	Description
`msg.min`	Override minimum
`msg.max`	Override maximum

Output

{
  "payload": 100,
  "clamp": {
    "input": 120,
    "output": 100,
    "min": 0,
    "max": 100,
    "clamped": true,
    "clampedAt": "max"
  }
}

Use Cases

Application	Description
Sensor	Limit sensor readings to valid range
Control	Constrain output to safe limits
UI	Ensure slider values stay within bounds
Safety	Prevent out-of-range values

Node Status

42 (in range) - Value passed through
100 (clamped, was 120) - Value was clamped at max
0 (clamped, was -5) - Value was clamped at min
Invalid range - min >= max

Author

sr.rpo

License

MIT