nodejs-poolController (njsPC)

Local, open-source control for Pentair IntelliCenter / IntelliTouch / EasyTouch, Jandy Aqualink, Hayward, and standalone pool equipment. A self-hosted alternative to the Pentair Home and ScreenLogic cloud apps — your data stays on your network, your pool responds in real time, and your smart home can finally see it.

🌊 Works with your gear — IntelliCenter (through firmware v3.008), IntelliTouch, EasyTouch, SunTouch, Aqualink, IntelliCom, or no controller at all (Nixie mode).
🏠 Plugs into your smart home — HomeKit/Siri (via Homebridge), Home Assistant (via MQTT), Hubitat, SmartThings, MQTT, InfluxDB, Alexa.
🔌 No cloud required — runs on a Raspberry Pi, NAS, or any Node.js 20+ host. Pairs with dashPanel for a web dashboard and REM for direct GPIO/i2c/SPI hardware I/O.

UI pictured: dashPanel, the recommended web client.

Quick start (Docker): see Docker Compose — one file, docker compose up -d, done. Quick start (source): git clone → npm install → npm start. Full steps in Installation. Hardware needed: an RS-485 adapter (or a ScreenLogic network connection) to talk to your equipment.

In the wild: featured in the TroubleFreePool IntelliCenter walk-through guide (thanks @MyAZPool). Actively maintained — questions welcome in GitHub Discussions.

+ Running IntelliCenter v3.008+? It's fully supported as of 9.0.
+ If anything looks off, please open a discussion with a replay capture.
+ See discussion #1171 for ongoing v3 updates.

What is njsPC?

njsPC is a Node.js service that talks to your pool controller over RS-485 (or ScreenLogic) and exposes everything — circuits, bodies, pumps, heaters, chlorinators, chemistry, lights, covers, valves, schedules — as a live REST + WebSocket API. Point a web client at it for a browser UI, or wire it into home automation so your pool shows up next to your lights and thermostats.

Want to add a low-cost controller to your pool?
Want a modern web interface for your existing system?
Want to turn pumps on remotely, or schedule them on sunrise/sunset?
Want your home automation hub to read and control your pool?
Want to run pumps or a chlorinator with no pool controller at all?

Equipment supported

Category	Supported	Notes
Controllers	IntelliCenter, IntelliTouch, EasyTouch, SunTouch, Aqualink, IntelliCom, Nixie (standalone)	RS-485 (preferred) or ScreenLogic (network)
Pumps	IntelliFlo VS / VSF / VF, IntelliFlo VS+SVRS, SuperFlo VS, Hayward Eco/TriStar VS, Hayward Relay VS, Whisperflo, single/two-speed, relay-controlled, Neptune Modbus, Regal (Century) Modbus	Regal added in 9.0 — PR #1169
Heaters	Gas, solar, heat pump, hybrid (ETi / ETi250), MasterTemp, Max-E-Therm, UltraTemp / UltraTempDirect
Chlorinators	IntelliChlor, Aqua-Rite, OEM brands	Dual chlorinators supported via REM
Lights	IntelliBrite, MagicStream, Jandy WaterColors, Hayward ColorLogic, Pooltone (Florida Sunseeker), plus legacy SAM / SAL / Color Wheel / Photon Gen
Chemistry	IntelliChem (OCP-paired and standalone), Relay Equipment Manager (REM)	Atlas Scientific pH / ORP / EC probes, flow, pressure, temperature via REM
Covers	IntelliCenter cover configuration & control	Live-state feedback is limited on ICv3
Filters	Configuration, pressure monitoring, clean/dirty thresholds
Valves	Standard intake/return with diverted status	Intellivalve planned
Home Automation	HomeKit/Siri (Homebridge), Home Assistant (via MQTT), Hubitat, SmartThings, MQTT, InfluxDB, ISY, Vera, Alexa	See Home Automation Bindings

What's new in 9.0

9.0 focuses on IntelliCenter v3.008 firmware compatibility and finishes the v3 work started in 8.4.1.

IntelliCenter v3.008 chlorinator support, including live-edit changes coming back from the panel.
Faster state updates on v3 — circuit, feature, and body changes made at the panel now appear in dashPanel within seconds.
v3 heater enhancements, including ETi250 support and broader heater control coverage.
v3 body and unit handling improvements, so capacity and English/Metric changes stay in sync between njsPC and the OCP.
Light group state fixes: themes, colors, and ON/OFF transitions sync correctly with the panel.
Firmware change detection — njsPC reloads its configuration automatically when the OCP firmware version changes.
Virtual equipment management with new REST endpoints.
Regal (Century) Modbus pump added, with collision detection and NACK/fault handling on Go/Stop commands — thanks to @celestinjr (PR #1169).

For previous releases (8.4.x, 8.3, 8.1, 8.0, 7.x and earlier), see the Changelog.

Installation Instructions

🔌 Before you start — hardware required njsPC needs a way to reach your pool bus:

RS-485 adapter (recommended) — see the adapter details wiki.

ScreenLogic (network connection) — if you already have a Pentair ScreenLogic box on your network.

Socat — to bridge a remote serial device, see the Socat wiki.

njsPC is the server. To actually use it you'll also want a web client (dashPanel) and/or a home automation binding.

Choose your install

Docker (easiest) — one compose file, docker compose up -d. Jump to Docker Compose.
From source (for developers / tinkerers / bleeding-edge users) — follow Prerequisites below. Recommended if you want to pull fixes as they land on master.

Prerequisites

If you don't know anything about Node.js, these directions might be helpful.

Install Node.js (v20+ required). (https://nodejs.org/en/download/)
Update npm (https://docs.npmjs.com/getting-started/installing-node).
Cloning the source is recommended — updates are frequently pushed while releases are infrequent. Clone with git clone https://github.com/tagyoureit/nodejs-poolController.git (Alternate — not recommended — download the latest release.)
Change directory into nodejs-poolController.
Run npm install in the new folder (where package.json exists). This installs all dependencies (serial-port, express, socket.io, etc).
Run the app with npm start.
- npm start compiles the TypeScript code. Use this every time you download/clone/pull the latest.
- npm run start:cached runs the app without compiling the code — much faster once built.
Install a web client for a browser experience and/or a binding for two-way control from Home Automation systems.

For a thorough walk-through, see the excellent TroubleFreePool IntelliCenter guide. Thanks @MyAZPool.

Upgrade Instructions

Assuming you cloned the repo, the following are easy steps to get the latest version:

Change directory to the njsPC app
Important: Ensure you have Node.js v20 or higher installed (node --version). If not, upgrade Node.js first.
git pull
Important: Run npm i to update dependencies. This is especially important when upgrading to version 8.3.0+ (including 8.4.x and 9.0.0+) as it requires Node 20+ and has updated dependencies.
Start application as normal, or if using npm run start:cached then run npm run build to compile the code.

Docker instructions

See the wiki. Thanks @wurmr @andylippitt @emes.

Image channels (important)

The project has multiple image channels. latest only means latest within that specific channel.

ghcr.io/tagyoureit/njspc - official controller image published from this repository's GitHub Actions (tracks upstream master).
msmi/nodejs-poolcontroller - legacy Docker Hub controller image (can lag upstream).
ghcr.io/rstrouse/njspc-dash - dashPanel image currently published separately.

Docker Compose (Controller + Optional dashPanel UI)

Below is an example docker-compose.yml snippet showing this controller (njspc) and an OPTIONAL dashPanel UI service (njspc-dash). The dashPanel image is published separately; uncomment if you want a built-in web dashboard on port 5150.

services:
   njspc:
      image: ${NJSPC_IMAGE:-ghcr.io/tagyoureit/njspc}
      container_name: njspc
      restart: unless-stopped
      environment:
         - TZ=${TZ:-UTC}
         - NODE_ENV=production
         # Serial vs network connection options
         # - POOL_NET_CONNECT=true
         # - POOL_NET_HOST=raspberrypi
         # - POOL_NET_PORT=9801
         # Provide coordinates so sunrise/sunset (heliotrope) works immediately - change as needed
         - POOL_LATITUDE=28.5383
         - POOL_LONGITUDE=-81.3792
      ports:
         - "4200:4200"
      devices:
         - /dev/ttyACM0:/dev/ttyUSB0
      # Persistence (create host directories/files first)
      volumes:
         - ./server-config.json:/app/config.json   # Persisted config file on host
         - njspc-data:/app/data                    # State & equipment snapshots
         - njspc-backups:/app/backups              # Backup archives
         - njspc-logs:/app/logs                    # Logs
         - njspc-bindings:/app/web/bindings/custom # Custom bindings
      # OPTIONAL: If you get permission errors accessing /dev/tty*, prefer adding the container user to the host dialout/uucp group;
      # only as a last resort temporarily uncomment the two lines below to run privileged/root (less secure).
      # privileged: true
      # user: "0:0"

   njspc-dash:
     image: ${NJSPC_DASH_IMAGE:-ghcr.io/rstrouse/njspc-dash}
     container_name: njspc-dash
     restart: unless-stopped
     depends_on:
       - njspc
     environment:
       - TZ=${TZ:-UTC}
       - NODE_ENV=production
       - POOL_WEB_SERVICES_IP=njspc      # Link to backend service name
     ports:
       - "5150:5150"
     volumes:
       - ./dash-config.json:/app/config.json
       - njspc-dash-data:/app/data
       - njspc-dash-logs:/app/logs
       - njspc-dash-uploads:/app/uploads

volumes:
  njspc-data:
  njspc-backups:
  njspc-logs:
  njspc-bindings:
  njspc-dash-data:
  njspc-dash-logs:
  njspc-dash-uploads:

Quick start:

Save compose file.
(Optional) create an empty config file: touch dash-config.json.
docker compose up -d
Visit Dash UI at: http://localhost:5150.

Notes:

Provide either RS-485 device OR enable network (ScreenLogic) connection.
latest is channel-specific; use image labels to verify exact code revision:
- docker image inspect ghcr.io/tagyoureit/njspc:latest --format '{{ index .Config.Labels "org.opencontainers.image.revision" }}'
- docker image inspect msmi/nodejs-poolcontroller:latest --format '{{ index .Config.Labels "git-commit" }}'
Coordinates env vars prevent heliotrope warnings before the panel reports location.
Persistence (controller):
- ./server-config.json:/app/config.json main runtime config. You can either:
  - Seed it with a copy of defaultConfig.json (cp defaultConfig.json server-config.json), OR
  - Start with an empty file and the app will auto-populate it from defaults on first launch. If the file exists but contains invalid JSON it will be backed up to config.corrupt-<timestamp>.json and regenerated.
- Remaining state (data, backups, logs, custom bindings) is typically stored in named volumes in the provided compose for cleaner host directories. If you prefer bind mounts instead, replace the named volumes with host paths similar to the example below.
- Data artifacts: poolConfig.json, poolState.json etc. live under /app/data (volume njspc-data).
- Backups: /app/backups (volume njspc-backups).
- Logs: /app/logs (volume njspc-logs).
- Custom bindings: /app/web/bindings/custom (volume njspc-bindings).
To migrate from bind mounts to named volumes, stop the stack, docker run --rm -v oldPath:/from -v newVolume:/to alpine sh -c 'cp -a /from/. /to/' for each path, then update compose.

Automate startup of app

See the wiki.

Ecosystem

njsPC is the server at the center of a small ecosystem. To do anything useful with it, you'll pair it with at least one of these:

Project	Role
njsPC (this repo)	Server that talks to your pool controller over RS-485 / ScreenLogic and exposes REST + WebSocket APIs.
dashPanel	Recommended web UI. Works with IntelliCenter, *Touch, and REM.
REM (Relay Equipment Manager)	Companion app for direct GPIO / i²c / SPI hardware — Atlas Scientific pH/ORP/EC/hum/prs/pmp/rtd probes, ADS1x15 A/D converters, pressure transducers, flow sensors, 10k/NTC temperature sensors.

Web Clients

dashPanel — full compatibility with IntelliCenter, *Touch, and REM. The recommended client.

Home Automation Bindings

Recommended integrations

Homebridge / HomeKit / Siri / EVE — Apple Home support via Homebridge (by @gadget-monk, adopted from @leftyflip). Control your pool from Siri, iOS Home, and Apple Watch.
MQTT — the universal bridge. Works out-of-the-box with Home Assistant, Node-RED, openHAB, and anything else that speaks MQTT. Original release by @crsherman, rewrite by @kkzonie, testing by @baudfather and others. Setup directions.
- Homeseer via MQTT — integration directions by @miamijerry.
Hubitat — native driver by @bsileo (with prior help from @johnny2678, @donkarnag, @arrmo). Setup directions.
InfluxDB — push pool telemetry into Grafana dashboards.

Community & legacy

Vera — plugin for the Vera hub. Setup directions.
Another SmartThings Controller by @dhop90 — older, community-maintained.
ISY — original credit to @blueman2, enhancements by @mayermd.
ISY Polyglot NodeServer — by @brianmtreese.

Support & Community

Discussions, recommendations, designs, clarifications — GitHub Discussions is the primary place. Questions are welcome.
Tips, tricks, and deeper docs — the wiki.
Bug reports — open a GitHub issue. For IntelliCenter or *Touch bugs, a replay capture is gold — it's usually how fixes get made.

How you can help

njsPC is a volunteer project. You don't need to write code to make a difference:

File a good bug report — with a replay capture attached. This is the #1 way non-coders unblock fixes for their own equipment.
Answer a question in Discussions.
Improve the wiki with setup notes, quirks, or photos of adapters / wiring that worked for you.
Submit a PR — pumps, heaters, lights, and home-automation bindings have all come from community contributors (see Credits).

Changelog

Full release history — Changelog.

Config.json reference

Expand for detailed config.json field reference (controller / web / log). Most of these can be set from dashPanel — you rarely need to edit this file by hand.

Controller section - changes to the communications for the app

Most of these can be configured directly from the UI in dashPanel.

rs485Port - set to the name of your RS-485 controller. See wiki for details and testing.
portSettings - should not need to be changed for RS485
mockPort - opens a "fake" port for this app to communicate on. Can be used with packet captures/replays.
netConnect - used to connect via Socat
- netHost and netPort - host and port for Socat connection.
inactivityRetry - # of seconds the app should wait before trying to reopen the port after no communications. If your equipment isn't on all the time or you are running a virtual controller you may want to dramatically increase the timeout so you don't get console warnings.
txDelays - (optional) fine‑grained transmit pacing controls added in 8.1+ to better coexist with busy or bridged (socat / multiple panel / dual chlorinator) RS‑485 buses. These values are all in milliseconds. If the block is omitted, internal defaults are used (see defaultConfig.json). All values can be hot‑reloaded from config.
- idleBeforeTxMs – Minimum quiet time on the bus (no RX or TX seen) before a new outbound frame may start. Helps avoid collisions just after another device finishes talking. Typical: 40‑80. Set to 0 to disable.
- interFrameDelayMs – Delay inserted between completed outbound attempts (success, retry scheduling, or queue drain) and evaluation of the next outbound message. Replaces the previous fixed 100ms. Typical: 30‑75. Lower values increase throughput but may raise collision / rewind counts.
- interByteDelayMs – Optional per‑byte pacing inside a single frame. Normally 0 (disabled). Set to 1‑2ms only if you observe hardware or USB adapter overruns, or are experimenting with very marginal wiring / long cable runs.

Example tuning block - more conservative pacing for SunTouch that works way better than defaults:

"txDelays": {
   "idleBeforeTxMs": 60,
   "interFrameDelayMs": 50,
   "interByteDelayMs": 1
}

Tuning guidance:

Start with the defaults. Only change one value at a time and observe stats (collisions, retries, rewinds) via rs485PortStats.
If you see frequent outbound retries or receive rewinds, first raise idleBeforeTxMs in small steps (e.g. +10ms) before touching interFrameDelayMs.
If overall throughput feels sluggish but collisions are low, you may lower interFrameDelayMs gradually.
Use interByteDelayMs only as a last resort; it elongates every frame and reduces total bus capacity.
Setting any value too high will simply slow configuration bursts (e.g. on startup); setting them too low can cause more retries and ultimately lower effective throughput.

All three parameters are safe to adjust without restarting; edits to config.json are picked up by the existing config watcher.

Web section - controls various aspects of external communications

servers - setting for different servers/services
http2 - not used currently
http - primary server used for api connections without secure communications
- enabled - self-explanatory
- ip - The IP of the network address to listen on. Default of 127.0.0.1 will only listen on the local loopback (localhost) adapter. 0.0.0.0 will listen on all network interfaces. Any other address will listen exclusively on that interface.
- port - Port to listen on. Default is 4200.
- httpsRedirect - Redirect http traffic to https
- authentication - Enable basic username/password authentication. (Not implemented yet.)
- authFile - Location of the encrypted password file. By default, /users.htpasswd. If you have authentication=1 then create the file users.htpasswd in the root of the application. Use a tool such as http://www.htaccesstools.com/htpasswd-generator/ and paste your user(s) into this file. You will now be prompted for authentication.
https - See http options above.
- sslKeyFile - Location of key file
- sslCertFile - Location of certificate file
mdns - Not currently used.
ssdp - Enable for automatic configuration by the webClient and other platforms.

Log - Different aspects of logging to the application

app - Application wide settings
- enabled - Enable/disable logging for the entire application
- level - Different levels of logging from least to most: 'error', 'warn', 'info', 'verbose', 'debug', 'silly'
packet - Configuration for the packet logger.

Credits

@Rstrouse — made the 6.0 rewrite and IntelliCenter support possible, continues to drive the project forward with monumental changes, and taught me a lot about coding along the way.
@jwtaylor310 — provided a ton of IntelliCenter v3.004+ replay captures that tracked down and fixed bugs.
Jason Young — foundational protocol decoding (read both posts).
Michael Russe (ceesco / CocoonTech) — detailed protocol writeup, also on Pastebin.
Michael Usner — first JavaScript implementation building on the above.
rflemming — first external contributor to the codebase.
@arrmo and @blueman2 — early and ongoing help on Gitter.
@celestinjr — Regal (Century) Modbus pump support (PR #1169).
All the community members across GitHub Discussions, Issues, and TroubleFreePool who've filed captures, tested builds, and kept pools running.

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nodejs-poolController (njsPC)

What is njsPC?

Equipment supported

What's new in 9.0

Installation Instructions

Choose your install

Prerequisites

Upgrade Instructions

Docker instructions

Image channels (important)

Docker Compose (Controller + Optional dashPanel UI)

Automate startup of app

Ecosystem

Web Clients

Home Automation Bindings

Support & Community

How you can help

Changelog

Config.json reference

Controller section - changes to the communications for the app

Web section - controls various aspects of external communications

Log - Different aspects of logging to the application

Credits

License

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README.md

Latest commit

History

README.md

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nodejs-poolController (njsPC)

What is njsPC?

Equipment supported

What's new in 9.0

Installation Instructions

Choose your install

Prerequisites

Upgrade Instructions

Docker instructions

Image channels (important)

Docker Compose (Controller + Optional dashPanel UI)

Automate startup of app

Ecosystem

Web Clients

Home Automation Bindings

Support & Community

How you can help

Changelog

Config.json reference

Controller section - changes to the communications for the app

Web section - controls various aspects of external communications

Log - Different aspects of logging to the application

Credits

License