> For the complete documentation index, see [llms.txt](https://docs.brewersfriend.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.brewersfriend.com/devices/ispindel.md).

# iSpindel

## iSpindel Wireless Hydrometer

Is a DIY free-floating digital hydrometer and thermometer for continuous fermentation real-time monitoring that operates on WiFi. [http://www.ispindel.de](http://www.ispindel.de/)

![](/files/-LY4ORdRWcDC8cRq3-k_)

### Brew Session Setup

See the [Fermentation](/brew-session/fermentation.md) tab in a brew session to turn on iSpindel logging.  After the device logs for the first time you will see the name show up in the devices section under the [Fermentation](/brew-session/fermentation.md) tab of the [brew session](/brew-session.md).

### Configuration (Firmware 7.1.4)

Your iSpindel Cloud URL can be found under integrations.  You will need this to enter into the iSpindel app.  <https://www.brewersfriend.com/homebrew/profile/integrations>

**Service Type:** HTTP

**Token / API Key:** \[API KEY]&#x20;

**Server Address:** log.brewersfriend.com

**Server URL (Plato, iSpindel Default):** /ispindel/\[API KEY]&#x20;

**Server URL (Specific Gravity\*\*):** /ispindel\_sg/\[API KEY]&#x20;

* Download the latest firmware: <https://github.com/universam1/iSpindel/releases>
* If this is your first time powering it on it will create an access point (AP) and you should connect to the iSpindel\_iSpindel000 WiFi network.  Then open a browser and go to <http://192.168.4.1>.   If you ever need to reset the WiFi, calibrate or change settings click the reset button 3 - 4 times then connect to the iSpindel AP (will need a small flat head screw driver).
* Go to the Maintenance page and scroll down to the Firmware update, select the file you downloaded above and click Update.
* \*\* You will need to change the polynominal in the config for the correct gravity value when using the specific gravity URL.

![](/files/295HpBYAhAWJWKmo85Ir)

### Calibrate

* Reconnect to the iSpindel AP
* Go to the Maintenance page and click calibrate.

![](/files/-LYlpsrtVOAHB6ch0wcH)

* These links may also be useful:
  * <http://www.ispindel.de/tools/calibration/calibration.htm>.
  * <https://github.com/universam1/iSpindel/blob/master/docs/Calibration_en.md>
* Verify the calibration on the Info page, you should see near 0.00 Gravity.
* Go to the Configuration page and enter your WiFi SSID and password.
* The update interval should be not less than 900 seconds or 15 minutes, 3600 for every hour.