GravityMon is an open source brewing software that allows you to build your own electronic hydrometer. With it
you can keep an eye on your fermentation progress without wasting a lot of beer on samples. Just integrate
it with your favourite brewing software. And its free!!
This builds on the excellent work done by the iSpindle project.
Works on hardware based on the iSpindel or the Floaty hydrometer.
If you like my projects and want to support me, please buy me a coffee or sponsor me on github. This will give
me energy to continue build new beer related open source projects.
Service integration
A number of popular brewing software are supported and validated, Most of these will work with limited setup.
Examples include; Brewfather, BrewSpy, Brewers Friend, Fermentrack,
Ubidots, Thingsspeak and Home Assistant.
Modern User Interface
The user interface is build on modern standards such as HTML5 and REST API's. Its easy accessible when the
device when placed in configuration mode via Wi-Fi. There are lots of configuration options available.
Create gravity formula
You don't need any excel sheets or other tools to create the calibration formula for the device. Just enter
your measurements and let the device calculate and validate the formula. You can view the result in a graph
and visually check if it looks good enough.
Customize data formats
There is a built editor to allow you to customize the data format that is sent to external services.
This makes it possible to support any external service without the need for software changes if the
services support HTTP or MQTT as transport.
Easy install via brewflasher
Installation has never been easier than via Brewflasher. Just download the software or try the web version.
Excellent work by Thorrak.
Simple upgrade from an calibrated iSpindel setup, formula and gyro calibration settings can be migrated
to GravityMon so that the upgrade can be done in a simple way.
Easy configuration
You can easily access the web based configuration by placing the device on a flat surface or plugging in
the charger.
When the device wakes up from deep sleep it will start the web server.
Multiple endpoints
The device has the possibility to send data to 5 different endpoints which means you can use multiple
services at once.
Gyro temperature
The gyro actually has a built in temperature sensor which can be used instead of the DS18B20. Its quite
accurate if the device has had at least 30 seconds to cool down between reads.
Stability detection
To improve stability in readings and movement will be detected when reading the gyro. If movement is
detected data will not be sent until data is stable again.
Internationalization
Temperatures can be shown in either Celsius or Fahrenheit and gravity in SG or Plato
Gravity correction
Temperature of the fluid will have an effect on the gravity. There is a built in feature to automatically
adjust gravity based on the temperature.
Temperature Sensor
High precision temperature measurement using an DS18B20 sensor.
Web Protocols
Support web standards for sending data; HTTP (Post/Get), MQTT and Influx DB v2
Open Source
Fully open source, free to use and modify in aligment with the MIT licence. Suggestions for new features is
appreciated.
Updates
Software can be updated over the air (OTA).
RESP API
Standard REST API for scripted interaction with the device.
Configuration
Lots of configuration options to tune the operations of the device.
Restore
Save your configuration and restore if needed.
Low battery
Enter battery savings mode when low battery is detected so you fermentation can be tracked.
Wifi Direct
Wifi Direct in combination with GravityMon Gateway.
New in v2.0
Bluetooth
Multiple bluetooth options.
Homebrew Talk
Join the community, get support and discuss the software.
GravityMon supports a number of hardware options where the standard iSpindle firmware only supports the ESP8266.
With some of the ESP32 options you can also add bluetooth broadcast support. It will also support the Floaty
Hydrometer hardware design which is based on ESP32.
The ESP32 will allow for more functionallity to be added which is not possible
with the limited RAM in the esp8266.
Dont use the ESP32C3 v1.0 board, this has ha faulty antenna and cannot transmit wifi data with high power.
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