> **Reflects code as of `afc304b` · regenerated `2026-05-11` via `npm run wiki:home`**
EVOLV is a Node-RED node library for wastewater plant automation, developed by the R&D team at Waterschap Brabantse Delta. Nodes follow the ISA-88 (S88) batch control standard. The library exposes 11 active nodes spanning four S88 levels — from Process Cell down to Control Module — plus one utility node for dashboard integration.
## Platform overview
```mermaid
flowchart TB
subgraph PC["Process Cell"]
ps[pumpingStation]:::pc
end
subgraph UN["Unit"]
mgc[machineGroupControl]:::unit
vgc[valveGroupControl]:::unit
reactor[reactor]:::unit
settler[settler]:::unit
monster[monster]:::unit
end
subgraph EM["Equipment"]
rm[rotatingMachine]:::equip
v[valve]:::equip
diff[diffuser]:::equip
end
subgraph CM["Control Module"]
meas[measurement]:::ctrl
end
subgraph UT["Utility"]
dash[dashboardAPI]:::neutral
end
ps --> mgc
ps --> vgc
mgc --> rm
vgc --> v
reactor --> diff
meas -.data.-> rm
meas -.data.-> v
meas -.data.-> reactor
meas -.data.-> settler
classDef pc fill:#0c99d9,color:#fff
classDef unit fill:#50a8d9,color:#000
classDef equip fill:#86bbdd,color:#000
classDef ctrl fill:#a9daee,color:#000
classDef neutral fill:#dddddd,color:#000
```
S88 colours: Process Cell `#0c99d9`, Unit `#50a8d9`, Equipment `#86bbdd`, Control Module `#a9daee`. Solid arrow = parent/child relationship. Dashed arrow = data flow (`measurement` feeds many node types). Source of truth: `.claude/rules/node-red-flow-layout.md` §14.
## Live nodes
| S88 | Node | One-liner | Wiki |
|---|---|---|---|
| Process Cell | **pumpingStation** | Manages a wet-well basin, hands demand to one or more group controllers. | [→](https://gitea.wbd-rd.nl/RnD/pumpingStation/wiki/Home) |
| Unit | **machineGroupControl** | Load-sharing across a group of rotatingMachines. | [→](https://gitea.wbd-rd.nl/RnD/machineGroupControl/wiki/Home) |
| Unit | **valveGroupControl** | Coordinated valve control across a group of valves. | [→](https://gitea.wbd-rd.nl/RnD/valveGroupControl/wiki/Home) |
| Utility | **dashboardAPI** | Bridge between EVOLV nodes and Grafana dashboard upserts. | [→](https://gitea.wbd-rd.nl/RnD/dashboardAPI/wiki/Home) |
Plus the shared library `generalFunctions` — not a Node-RED node itself; provides `BaseDomain`, `BaseNodeAdapter`, `ChildRouter`, `UnitPolicy`, `MeasurementContainer`, command registry, logger, and config manager.
