Nautilis iRelay NXT

Next generation relay for iSpindel and fermentation monitoring.

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Nautilis iRelay NXT is made for brewers who want a dedicated device for digital hydrometer data. It provides local monitoring, web configuration and forwarding to supported external services.

Main features

  • WiFi relay for fermentation data
  • Local monitoring and configuration
  • Support for iSpindel style data
  • Remote service forwarding
  • Firmware update support
  • Automatic OG detection with manual OG adjustment
  • “Start New Fermentation” action for each iSpindel
  • HTTP/cloud connection diagnostics
  • Actual HTTP response codes and forwarding status
  • Separate forwarding and fermentation tracking for up to two iSpindels

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Nautilis iSpindel iRelay NXT

Smart solution for fermentation monitoring

The iSpindel WiFi iRelay NXT is an advanced device designed to receive, process, and distribute data from digital hydrometers iSpindel and HYDROM. It ensures reliable fermentation tracking by displaying data on a 1.28" round TFT screen, accessing it via the local web interface, or forwarding it to supported applications.

Supported fermentation monitoring platforms:

✅ MQTT / Home Assistant
✅ Nautilis TapBoard
✅ BrewSpy
✅ Brewfather
✅ Monitor.Beer
✅ Grainfather
✅ Little Bock
✅ Brewers Friend
✅ BrewBench
✅ UbiDots ✅ HTTP 

What does the device screen display?

✔️ (1) Hydrometer battery voltage
✔️ (2) iSpindel tilt angle
✔️ (3) Temperature
✔️ (3) Specific Gravity (SG)
✔️ (4) WiFi Signal strength
✔️ (5) WiFi status ✔️ (6) Pressure (if pressure sensor is connected)
✔️ (7) Hydrometer name ✔️ (7) iRelay name
✔️ (8) Temperature (ambient or probe-based)
✔️ (9) iSpindel status
✔️ (10) iSpindel signal strength
✔️ (12) Last hydrometer reading (changes color if the spindle is not seen in the interval)

Exceptional WiFi connectivity

✅ Tested in extreme conditions:
The hydrometer was placed inside a 2 mm thick stainless steel fermenter with a 6 mm thick lid and locked in a freezer. The signal still penetrated easily.

✅ Energy efficiency:
Due to its reliable connection, iSpindel consumes less battery, significantly extending its lifespan.

✅ Internet-independent operation:

  • iSpindel no longer requires the internet to send data to iRelay.
  • iRelay also does not need the internet unless remote monitoring is required via one of the supported apps.

Power and charging

🔌 Powered via a standard 5V USB-C charger (mobile phone charger).
⚠️ Recommended cable: USB-A to USB-C (not compatible with USB-C to USB-C cables).
⚡ Ultra-low power consumption.

Additional features

Faster hydrometer calibration

✔️ Displays the tilt angle to assist with precise calibration. ✔️ Rotatable display for ultimate flexibility.

Wireless firmware updates (OTA)

✔️ Regular firmware improvements via the web interface.
✔️ No need for physical connection to a computer.

Supports two iSpindel hydrometers simultaneously

✔️ Audio confirmation tone when saving settings.
✔️ Alarm for high or low hydrometer temperature.
✔️ Notification when the specific gravity (SG) drops below a set threshold.

Automatic SG and temperature correction

✔️ Applied to both the display and Blynk app.
✔️ Option to choose between Plato and SG units.
✔️ Plato-to-SG conversion available in the iRelay web interface (affects display only, apps receive raw iSpindel data).

Add-ons: Thermometer, Pressure Sensor & Decorative LED Lighting

🌡️ External or ambient thermometer

✔️ Alarm when temperature is too high or too low.
✔️ Extendable sensor cable without affecting accuracy.
✔️ Fermentation monitoring: Can be placed on the fermenter shell to prevent temperature controller failure (STC-1000).
✔️ Temperature unit selection: °C or °F.

✅ Integration with:

  • Homeassistant, BrewSpy, Brewfather, Grainfather (temperature updates every 1.5 or 15 min).

🔄 Nautilis iRelay NXT-P (Pressure Sensor)

✔️ Displays pressure readings on-screen and sends data to applications.
✔️ Compatible applications:

  • Homeassistant (min 10 sec interval)
  • BrewSpy (min 5 min interval)
  • SensorSpy (min 5 min interval)
  • Brewfather (min 15 min interval)
    ✔️ Alarm notifications via mobile apps.
    ✔️ Units: Bar or PSI.

⚠️ The pressure sensor is sold separately.
🔗 Order here.

Decorative LED Lighting

The decorative LED lighting is blue and can be turned off if needed. It adds a stylish touch to the iRelay case, especially when a magnet is attached to the case, allowing it to stick to a fridge for a sleek and modern look.

Nautilis iSpindel and iRelay settings

1. Configuring Your iSpindel

  1. Turn on your iSpindel.

  2. Open WiFi Manager and enter the following:

Field Value
SSID nautilis-ispindel (or your custom AP SSID)
Password Written on the device paper or your custom AP password
iSpindel Name 1-YourName[SG] (first character must be a number; max 16 characters; [SG] required for Brewfather)
Service Type HTTP
Token Leave blank
Server Address 192.168.4.1
Server Port 80
Path/URI /gravity

  • Tip: If using two iSpindels, name the second one 2-YourName[SG].

  • Don’t forget calibration: Use the SG calibration table available here

2. Connecting iRelay to WiFi

  1. Connect to the WiFi network transmitted by the relay (nautilis-ispindel by default).

  2. Open a browser and go to: 192.168.4.1 to access the Nautilis Controller Management page.

  3. From here, you can view and edit:

  • WiFi and service configurations (Blynk, UbiDots, Brewfather, etc.)

  • AP SSID & Password (firmware ≥ 6.3.1)

Note: If you change the AP SSID/password, update the iSpindel configuration accordingly.

3. Configuring Online Services

You can integrate your iRelay with several platforms. Always ensure network names and passwords are case-sensitive.

UbiDots

-Select UbiDots service. -Enter your API Token in the Custom Stream URI/TOKEN field. -Set the temperature sending interval in the thermometer menu. -Can support multiple hydrometers (max 2 per iRelay).

Brewfather

-Select Brewfather service. -Enter your personal PATH/URI (e.g., /ispindel?id=123456789). -Can support multiple hydrometers (max 2 per iRelay). -Temperature data is updated every 15 minutes.

BrewSpy

-Select BrewSpy service. -Enter hydrometer token. -Can support multiple hydrometers (max 2 per iRelay). -Minimum data sending interval: 300s (5 minutes).

MQTT (for Home Assistant or other systems)

-Select MQTT service. -Enter MQTT Server, username, password. -Port is fixed at 1883. -Minimum sending interval: 10 seconds. -Can support multiple hydrometers (max 2 per iRelay). -Integrate with Home Assistant using MQTT auto-discovery.

HTTP Service (e.g., Fermentrack)

-Select HTTP service. -Enter TOKEN, HTTP Server, URI. -Can support multiple hydrometers (max 2 per iRelay). -Port is fixed at 80. -Minimum sending interval: 10 seconds.
Each iSpindel reading is forwarded as a separate JSON HTTP POST request immediately after it is received. Data from two iSpindels is not combined into a single payload. Optional iRelay thermometer and pressure sensor data is sent separately at the configured interval.

Grainfather

-select Grainfather service type or HTTP - Enter Server URL from ispindel instructions into URI/PATH field; leave the other fields empty - For HTTP service type enter all data from iSpindel instructions. - Grainfather allows receiving only one iSpindle per iRelay -Minimum sending interval: 900s

Little Bock
Select Little Bock as the service type and enter the PATH/URI provided by Little Bock. When two iSpindels are enabled, a separate PATH/URI can be configured for each device, for example /api/log/ispindle/14934/6192. Each iSpindel reading is forwarded separately when received.

Monitor.Beer, Brewers Friend, BrewBench

-Follow similar steps: network name & password, service type, PATH/URI or TOKEN. -Ensure sending interval is ≥ 15 minutes for iSpindel.

4. Management Options in the Controller

  • Firmware OTA update – upgrade wirelessly through the Update Firmware.

  • Audio alarm – enable/disable as needed through the Device config.

  • Hydrometers –

    Configure connected iSpindels (1 or 2 devices). Settings include: Number of active iSpindels Measurement unit (SG or Plato) Calibration mode (SG or Plato conversion) Temperature and gravity corrections Alarm limits (temperature and gravity) Individual settings per iSpindel Save changes to apply configuration.
  • Live Data & Diagnostics – View current readings, WiFi signal, IP addresses, selected cloud service, actual HTTP response codes, time since the last response and successful transmission, and consecutive forwarding errors.
  • Start New Fermentation – Reset OG, ABV, attenuation and graph history for an individual iSpindel and restart automatic OG detection.

  • Pressure sensor – enter calibration data through the Device Config.

  • Thermometer – enable/disable, select °C or °F, set low/high alarms through the Device Config

  • Live data – view current readings.

  • Reboot – restart the device from the management page.

5. Tips

  • First-time connection: the iSpindel name is saved on the server; only then can you use it in the app.

  • Ensure calibration formulas are correctly pasted into the service configuration.

  • For multiple iSpindels or relays, use unique network names and device names to avoid conflicts.

About

Nautilis Development Hub is a personal engineering workspace dedicated to creating reliable monitoring solutions, embedded electronics and cloud-connected applications.

Current focus includes Nautilis Monitoring, iRelay devices, fermentation tracking systems and ESP-based hardware platforms.

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Contact

For project inquiries, collaboration or technical questions:

info@nautilis.eu

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