iSpindel WiFi relay

iSpindel WiFi relay is a device used for signal amplification and connection of a digital hydrometer – iSpindel, processing of received data and further distribution according to fermentation monitoring applications. The data measured by the hydrometer is displayed on a large TFT display, can be viewed via the local relay website or sent to the Blynk mobile application where graphs, analytics, remote insight into the state of the fermenter and more are available. After version 6, it is possible to send hydrometer data to the following services: UbiDots, BrewSpy, Brewfather, Monitor.Beer, Grainfather, Little Bock. The last time the hydrometer data was read, as well as the density, temperature, battery voltage, signal strength, name of the hydrometer, are shown on the device screen and website.  The signal strength of the iSpindel WiFi relay was tested by placing the hydrometer in a 2mm thick steel barrel and a 6mm lid without a rubber seal with a stainless steel clamp system, and placed the barrel in a closed freezer. And in such conditions, the signal easily broke through to the hydrometer.

Due to its extremely reliable connectivity, iSpindel consumes noticeably less power and thus lasts longer. iSpindel WiFi relay is powered by a 5V micro USB cell phone charger that can also be used to charge your hydrometer battery, and your power consumption is negligible. The iSpindel hydrometer no longer needs the Internet, and  WiFi relay it doesn’t need either. Now the internet connection is only needed when you need a remote insight into the fermentation state via the previously mentioned applications. The gadget can greatly facilitate and speed up the calibration of the iSpindel hydrometer, as it displays an angle.

The relay firmware is constantly being upgraded and improved. Firmware upgrades, if necessary, they upgrade wirelessly via OTA (Over the Air) and the device’s web interface.

Currently 2 iSpindel hydrometers can be connected to the iSpindel WiFi relay. From firmvare V5.8.1 any irregularities or warnings on the display are shown in red colour. A confirmation tone sounds when saving the settings and a continuous alarm occurs at too low or too high hydrometer temperature and when the specific gravity falls below the value you specify.

iSpindel relay has posibility of entering OG for 2 hydrometers from which % ABV and attenuation are then automatically recalculated. The latest firmware has SG and temperature correction for both iSpindels applied to the Display and Blynk Application.

The battery status of the iSpindel is displayed as a graphic icon showing the battery voltage and as a percentage of the remaining voltage. Next to the battery status icon is a graphic display of the signal strength according to the hydrometer, and next to it is a graphic display of the signal strength according to the home WiFi network. If the Relay is not connected to home WiFi then the “D” (Disconeconnected) mark is visible instead of the signal strength display.

An additional option
Ambient thermometer can be installed if you want. The outdoor or ambient thermometer has the ability to alarm you when temperature too high or too low is. The length of the sensor can be extended without affecting the measurement. Also, this thermometer can be placed on the fermenter shell and serve as protection against fermentation temperature controller failure (STC – 1000).

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Ebay link:
Nautilis Relay is also available on Ebay!

If there is none in stock on Ebay, please contact us!

If You order by e-mail, the device price is 10% lower than on Ebay, and for UK or non-EU customers there is no additional 25% tax.
There is also a relay and ispindel option together.

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Nautilis Relay is  also available on Ebay!

If it is no longer available on Ebay, contact us and we will let you know when it will be available again.

How to use Nautilis iSpindel WiFi Relay?

To turn on, use a Micro USB mobile phone charger that is declared exactly at 5V and a minimum of 700mA.

First change settings on the Ispindel management

Turn on your Ispindel and change the Configuration parts in the WiFi manager to:

SSID: nautilis-ispindel (If you have changed the AP SSID then enter the changed ssid here.)
PASS: nautilis-ispindel ssid password  (If you have changed the AP Password then enter the changed pass here. The relay comes with a piece of paper with your password written on it.)
iSpindel name: 1-enter_your_name[SG] //The first character of the name must be a number; for Brewfather add [SG] on the end, without spaces. A maximum of 16 characters may be in the name of iSpindel. Some special characters take up more space, so make that number smaller. If the name is too large, there is a possibility of periodic resetting of the device.
Service Type: HTTP
Token: leave blank! // If there is a space here, the device will not connect.
Server address:
Server port:
Path/URI: /gravity

Don’t forget on the calibration formula! Use the SG calibration table located at this link.

If you use 2 iSpindels:

All settings are the same as on the first iSpindel, except that the name of the second iSpindel must start with the number 2:
iSpindel name: 2-enter_your_name-[SG] // first digit and then name and finally [SG] for brewfather

Nautilis Controller management system

View and edit relay settings (no internet required)

To view and change the device settings, first connect to the WiFi network that the device transmits, which is usually: nautilis-ispindel. After connecting to the network, some devices automatically open the Internet browser, and some require you to open the Internet browser and go to the address:

After that, the Nautilis Controller managment home page opens where you can view and edit the following settings:

-Configuration (configuration of your WiFi network,Blynk and other services)

Leaving one of the fields blank will save it as blank. The current settings view is at the bottom of the page. After saving, the device needs to be physically restarted, or you can use the Nautilis Controller management and the Reboot menu to make the changes active.


As of firmware version 6.3.1, it is possible to update and change the AP SSID and password. This means that if you change it you have to change it on the iSpindel settings as well. Now the WiFi network transmitted by the relay can have the name of your choice. Do not use special characters, spaces, or more than 16 characters in the network name. When using 2 or more relays, the WiFi network names must be different between them.

To set up the Blynk service, you need to:

1. Network name (watch out for your WiFi network – be case sensitive), 2. Network password 3. Select Blynk server, 4. TOKEN (Blynk token)
Unclaimed fields must be empty.

To set up the UbiDots service, you need:

1. Network name (watch out for your WiFi network – be case sensitive), 2. Network password (select your WiFi network password) 3. Select service type (check Ubidots), 4. TOKEN (your API token in your Ubidots STEM account)
Unclaimed fields must be empty.

To set up a Brewfather service, you must:

1. Network name (watch out for your WiFi network – be case sensitive), 2. Network password 3. Select service type (select Brewfather), 4. PATH / URI (enter your personal PATH / URI )
Unclaimed fields must be empty.

To set up a BrewSpy service, you need:

1. Network name (watch out for your WiFi network – be case sensitive), 2. Network password 3. Select service type (highlight BrewSpy), 4. TOKEN (your hydrometer token you use) Note code BrewSpy services can only use 1 hydrometer.
Unclaimed fields must be empty.

To set up the Monitor.Beer service, you need:

1. Network name (watch your WiFi network name – be case sensitive), 2. Network password 3. Select service type (check Monitor.Beer), 4. PATH / URI (enter your personal PATH) / URI / ispindel /? Your username).
Unclaimed fields must be empty.

– In iSpindel settings, the interval must be set to at least 900 s (15min).

-The first time you connect to a service the name of your hydrometer is saved to the server and only then you can use it in the application. In the service, the calibration formula you are using must be specifically pasted.

To set up the Grainfather service you need:

1. Network name (name of your WiFi network – pay attention to lowercase – uppercase letters), 2. Network password (password of your WiFi network) 3. Select service type (mark Grainfather), 4. PATH / URI (enter the url of your iSpindel).
Unclaimed fields must be empty. Currently, only 1 iSpindle can be connected to Grainfather.
– In the iSpindel settings, the interval must be set to at least 900 s (15min).

To set up the Little Bock service you need:

1. Network name (name of your WiFi network – pay attention to lowercase – uppercase letters), 2. Network password (password of your WiFi network) 3. Select service type (mark Little Bock), 4. PATH / URI (enter the url of your iSpindel).
Unclaimed fields must be empty. Currently, only 1 iSpindle can be connected to Little Bock.
– In the iSpindel settings, the interval must be set to at least 900 s (15min).

-Firmware Update Over-the-Air programming (OTA) is a wireless upgrade of the device firmware. Opening the menu will open you an upgrade page. You find the latest firmware on the device you connected to the website and upload the same to the system. when you get the notification Ok, the firmware has been successfully upgraded.

-Audio alarm – If necessary, it is possible to turn off / on the audible alarm

– Management (Selecting the number of available hydrometers, set high, low alarms and gravity alarm)

– Measured data

-Reboot – Opening this link will reboot the device.

I’ve made Nautilis iSpindel app. You are welcome to try it out!

To start using it:
1. Download Blynk App: or
2. Touch the QR-code icon and point the camera to the code below (You need 2000 free Blynk energy)
3. Enjoy in app!

To install all the features built into the firmware 6.2.6 requires 6600 Blynk energy, then use the QR below. All options are available on the local website, so this option is optional. To manually set up the Blynk app, virtual pins are located at the bottom of the web page.

Installation and setup of Blynk application

Warning before upgrading the firmware!

Sometimes IOS  devices can interrupt WiFi signal and thus interrupt the OTA firmware upgrade. Then the device no longer transmits WiFi signal and OTA upgrade is not possible. The normal upgrade takes about 20 seconds and if all is well, OK appears on the white page. If the upgrade is not OK, you can see it by the fact that the relay stops working and that the screen is blank on it. Only thing then is to upgrade firmware via USB cable. How to upload firmware via USB cable?


04/10/2021 Firmware 6.3.7 Download -Little Bock service has been added to the relay

04/06/2021 Firmware 6.3.6 Download -Graphic upgrade to display and new display driver.

03/02/2021 Firmware 6.3.4 Download -Graphic upgrade to display second hydrometer
02/25/2021. Firmware 6.3.3
– added support for connecting to brewpiless (beta – under conctruction)
– Graphic display of the state of the hydrometer battery, graphical display of the signal strength according to the hydrometer, graphic display of the signal strength according to the home WiFi network.
01/30/2021 Firmware 6.3.2 Download Added a new menu and the ability to turn audio alarms on and off
01/18/2021 Firmware 6.3.1 Download Added the ability to change AP SSID name and AP Password
01/11/2021 Firmware 6.3.0 Download Added the ability to connect to the Grainfather app.
12/28/2020 Firmware 6.2.9 Download Displays the percentage of battery next to the remaining voltage. The values in the percentage formula are: 4.2V for Voltage.max and 3.3V for Voltage.min. The percentage is also visible on the local website and can be sent to the Blynk app via a virtual pin.It is recommended to calibrate the battery and change the correction factor before using the iSpindle. By default, ispindel batt factor is 191.8. You can adjust it by this formula: (displayed voltage / measured voltage) * current factor (191.8) = new factor
The new factor should be between current factor more or less 20%.

12/26/2020 Firmware 6.2.8 Download It is possible to switch the thermometer on and off if it is installed on a relay. It is possible to install a thermometer in the relay as a DIY project.

12/12/2020 Firmware 6.2.7 Download The Configuration menu has an option to restore the factory settings. Pressing the reset menu deletes all saved content. After resetting, the device needs to be restarted.

12/12/2020 Firmware 6.2.6 Download Enabled sending ABV, ATT and OG to Blynk. ABV and ATT code changes for Ispindel 2.

12/09/2020 Firmware 6.2.5 Download Improvements in receiving ispindel data in an environment where there is no WiFi signal or incorrect SSID & password data.

12/07/2020 Firmware 6.2.4 Download Possibility of temperature correction for both iSpindles applied on display and Blynk application.

11/25/2020 Firmware 6.2.3 – Possibility of SG correction for both iSpindels applied on display and Blynk application.

11/04/2020 Firmware 6.2.2 Download New redesign of displaying data on the screen, new look of the local website, OG input and automatic conversion to the percentage of ABV and attenuation. Fixes an issue with displaying an empty field on a local website from V 6.2

10/25/2020 Firmware 6.2.1 – Ability to use a static IP address. When ordering, it is necessary to specify that you want a static IP address.

10/12/2020 Firmware 6.2 – New design and functionality of config and mangement website.

10/09/2020 Firmware 6.1.8 – If the iSpindle is not connected yet – SG 0 and temperature 0 is not displayed as an alarm

10/01/2020 Firmware 6.1.7 – Changed IP address of local Blynk server

09/16/2020 Firmware 6.1.6 – Fixed an issue with saving configuration settings caused by a different memory processor controller.

07/14/2020. Firmware 6.1.5 -Added SG alarm – When the gravity value falls below the alarm value, you will be notified by sound, red SG data on the screen and with a notification on the mobile phone, if you use the Blynk application.

07/13/2020. Firmware 6.1.4 – Added the same options for Ispindel 2.

07/12/2020. Firmware 6.1.3 – Deleted protection on the website, and added a password to the WiFi network – you need to add a password to your iSpindle settings!

04/20/2020. Firmware 6.1.2 – Send data to Monitor.Beer service available

04/10/2020. Firmware 6.1.1 – Improvement in connection to Ubidots, Brewfather and Brew Spy service

04/06/2020. Firmware 6.1 – Changes in Nautilis management for easier setup of new services

04/05/2020. Firmware 6.0 – Send data to Ubidots, Brewfather, BrewSpy available

04/04/2020. Firmware 5.9.4 – Alarm when the outside temperature is too high or too low.

03/04/2020. Firmware 5.9.3 – Change the display of data on the screen. Improved hydrometer connection.

02/04/2020. Firmware 5.9.2. – Added option for external thermometer, created design for new PCB.

01.04.2020. Firmware 5.9.1 – Added beep when saving settings, as well as audible alarms when the hydrometer temperature is too low or too high.

31.03.2020. Firmware 5.9 – Changing hardware connection of components

26.03.2020. Firmware 5.8.1. – Built-in alarm (cellphone notification) at too high and too low temperatures. These is protection from failure of the fermentation temperature controller or calming the fermentation of beer. At too low, a temperature is shown on display in dark blue and too high in red colour. The alarm temperature is set via the Blynk app or through the local web interface.

26.03.2020. Firmware 5.8. – Change the color of the signal strength text and battery status from green to red when the signal is less than -78 or the battery is less than 3.65 V – Change the color of the iSpindel name. When connected to Blynk the color is green and when it is not, red. – Improved display data quality.


Question: Relay has a white screen. What happened?
There are several possible reasons for a white screen. The first is inadequate relay power supply (5V and min 700mAh), if the firmware upgrade stops this process when it has not reached the end. When you accidentally click on firmware update and do not load the appropriate firmware. Then the device has no firmware installed and a white screen is visible. The power cord has a mixed + and GND

Question: Relay does not save my settings after reboot. What’s the problem?
Download new firmware version and upgrade it using the OTA menu on the local website and if after the upgrade it says OK restart the device and try again. Sometimes this is due to different versions of the hardware. New versions will be intensively tested and will no longer have such problems.

Question: The SG on the relay screen is not the same as the SG on the Brewfather application. Why??
Your hydrometer calibration formula isn’t in SG, but in some other unit probably in PLATO. The Brewfather application automatically converts these units to SG. That’s why it is important use SG calibration formula and put [SG] at the end of the Ispindel name as is described on the Brewfather pages.

Question: The name iSpindel is shown in red on the screen, and in your pictures it is green?
Answer: If you connect your relay to the Blynk application, then the name will also be green on your relay.

Question: Relay constantly produces sounds. Is that normal?
Answer:Check on the local relay website that the alarm parameters are outside the received iSpindel data. Therefore, the SG alarm must be lower than measured, the low temperature alarm must be lower than measured, and the high temperature alarm must be higher than measured.

Question:Why relay supports only 2 iSpindels?
Due to better signal quality. If the fermenters are moved away there is a chance that the signal will not reach the relay.

To manually set up the Blynk application, the virtual pins are as follows:

(V61, angle);
(V62, temperature);
(V63, battery);
(V64, gravity);
(V65, interval);
(V66, RSSI);
(V67, alarm_LOW temp);
(V68, alarm_HiGh temp);
(V69, alarm_SG1);
(V50, ABV);
(V51, Attenuation);
(V52, OG1);
(V53, battery left percentage);

(V70, name);
(V71, angle);
(V72, temperature);
(V73, battery);
(V74, gravity);
(V75, interval);
(V76, RSSI);
(V77, alarm_LOW temp);
(V78, alarm_High temp);
(V79, alarm_SG2);
(V80, ABV);
(V81, Attenuation);
(V82, OG2);
(V83, battery left percentage);

V14 – Relay thermometer low temperature alarm
V15 – Relay thermometer high temperature alarm