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EVOLV/manuals/node-red/flowfuse-ui-gauge-manual.md
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-04 21:07:04 +01:00

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# FlowFuse `ui-gauge` Manual (EVOLV Reference)
Source: https://dashboard.flowfuse.com/nodes/widgets/ui-gauge.html
## Gauge Types
| `gtype` value | Visual | Best For |
|---------------|--------|----------|
| `gauge-tile` | Compact square with value | KPI tiles |
| `gauge-battery` | Horizontal battery bar | Charge / capacity |
| `gauge-tank` | Vertical tank with fill gradient | Liquid levels |
| `gauge-half` | 180° arc | Setpoint / range display |
| `gauge-34` | 270° arc | Primary process gauge |
## Properties
| Property | Type | Dynamic | Notes |
|----------|------|---------|-------|
| `group` | ref | No | Parent ui-group |
| `width` | int | No | Columns (max = group width) |
| `height` | int | No | Row units |
| `gtype` | string | Yes | See table above |
| `gstyle` | string | Yes | `"Needle"` or `"Rounded"` (half/3-4 only) |
| `min` | number | Yes | Range minimum |
| `max` | number | Yes | Range maximum |
| `segments` | array | Yes | `[{color: "#hex", from: number}, …]` |
| `title` | string | Yes | Label above gauge |
| `prefix` | string | Yes | Before value (half/3-4 only) |
| `suffix` | string | Yes | After value (half/3-4 only) |
| `units` | string | Yes | Small text below value (half/3-4 only) |
| `icon` | string | Yes | Material Design icon (half/3-4 only) |
| `sizeGauge` | int | No | Arc thickness px |
| `sizeGap` | int | No | Gap between arc & segments px |
| `sizeSegments` | int | No | Segment ring thickness px |
## Input
`msg.payload` — numeric value to display.
## Dynamic Properties (`msg.ui_update`)
```js
msg.ui_update = {
label: "Tank A",
gtype: "gauge-tank",
gstyle: "Rounded",
min: 0, max: 100,
segments: [{color:"#f44336", from:0}, {color:"#4caf50", from:25}, {color:"#f44336", from:90}],
prefix: "", suffix: "%", units: "fill"
};
```
## Segments
Array of `{color, from}` objects sorted ascending by `from`. Each segment colors the range from its `from` up to the next segment's `from` (or `max`).
**Tank default segments** (auto-applied when switching to tank type):
```json
[{"color":"#A8F5FF","from":0},{"color":"#55DBEC","from":15},
{"color":"#53B4FD","from":35},{"color":"#2397D1","from":50}]
```
## CSS Selectors
| Selector | Target |
|----------|--------|
| `.nrdb-ui-gauge-value span` | Central value text |
| `.nrdb-ui-gauge-value label` | Unit label |
| `.nrdb-ui-gauge-value i` | Icon |
| `.nrdb-ui-gauge #limits` | Min/max labels |
## EVOLV Key Rules
1. **Tank gauge** for basin level: set `gtype:"gauge-tank"`, `min:0`, `max:<basin height>`, custom segments by safety thresholds.
2. **3/4 gauge** for fill %: set `gtype:"gauge-34"`, `gstyle:"Rounded"`, `min:0`, `max:100`, segments for low/normal/high.
3. Recommended sizing: tank `width:2, height:4`; 3/4 arc `width:2, height:3`.
4. Send plain numeric `msg.payload` — no topic needed (gauge has no series concept).
5. Segments must be provided as array even for a single color range.
## Node JSON Example (tank)
```json
{
"id": "demo_gauge_tank_west",
"type": "ui-gauge",
"z": "demo_tab_dashboard",
"group": "demo_ui_grp_ps_west",
"name": "West Tank Level",
"gtype": "gauge-tank",
"gstyle": "Rounded",
"title": "Level",
"units": "m",
"prefix": "",
"suffix": "m",
"min": 0, "max": 4,
"segments": [
{"color":"#f44336","from":0},
{"color":"#ff9800","from":0.3},
{"color":"#2196f3","from":1.0},
{"color":"#ff9800","from":2.5},
{"color":"#f44336","from":3.2}
],
"width": 2, "height": 4,
"order": 2,
"x": 700, "y": 400,
"wires": []
}
```