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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

manuals/node-red/flowfuse-ui-gauge-manual.md

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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": []
+}
+```