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https://github.com/s60sc/esp32_specificgravity

Calculates fermentation Specific Gravity from tilt angle of floating sensor
https://github.com/s60sc/esp32_specificgravity

beer esp32 esp32-arduino fermentation hydrometer mpu6050 specific-gravity spindel

Last synced: 3 days ago
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Calculates fermentation Specific Gravity from tilt angle of floating sensor

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README 

        
# ESP32_SpecificGravity



Device to calculate Specific Gravity of wort during fermentation from tilt angle of floating sensor, where tilt angle varies with liquid density. 

Designed to provide a qualified rather than precise value for Specific Gravity for simplicity of calibration.



Uses the hardware design approach from http://www.ispindel.de/docs/README_en.html

but simplified to use an ESP32 module with an integral 18650 battery holder and battery management IC TPS5400, and obtain G force readings and temperature from a separate MCU6050 accelerometer on GY-521 module.

The code base has been independently developed.



The generated data is packaged into a json string, this data can be viewed:

* whilst the ESP32 is awake by using its own web server accessed from a browser.

* on a remote host listening receiving json data using a http client. 



On power up, ESP32 will remain awake for calibration purposes (see below) until user presses the __Start__ button on the web page.

The ESP32 will then periodically wakeup to collect data and send this to the remote host, then return to deep sleep.



## Installation



Download github files into the Arduino IDE sketch folder, removing `-main` from the application folder name.



Compile using arduino core v2.x or V3.x (min v3.0.3) and the following Partition scheme:

* ESP32-S3 - `8M with spiffs (...)`

* ESP32 - `Minimal SPIFFS (...)`



On first installation, the application will start in wifi AP mode - connect to SSID: **ESP32_SG_...**, to allow router and password details to be entered via the web page on `192.168.4.1`. The configuration data file (except passwords) is automatically created, and the application web pages automatically downloaded from GitHub to the SD card **/data** folder when an internet connection is available.



Subsequent updates to the application, or to the **/data** folder files, can be made using the **OTA Upload** tab. The **/data** folder can also be reloaded from GitHub using the **Reload /data** button on the **Edit Config** tab, or by using a WebDAV client.



## Setup and Calibration



The ESP32 and GY-521 modules fit snugly into a 33mm width x 120mm height PETling:



![image1](extras/device.png)



To view current data and calibrate device before each use:

* Open App web page to get readings.

* Balance device in PETling so settles at c. 25 deg angle in plain water at 20C, then press __Set WA__ button to set lower range of curve.

* Use hydrometer to measure the original gravity of the wort prior to fermentation.

* Enter hydrometer value into __Original Gravity__ field, e.g. 1.045.

* Place device in wort and wait till angle settles, then press __Set OG__ button to set upper range of curve.

* Press __Start__ button to start monitoring, device will go to sleep

* Press __Reset__ to reenter calibration mode.  

  If the device is in deep sleep, pressing boot button has same effect.



![image1](extras/webpage.png)



## Configuration



The device can be configured from the web page under __Edit Config__ tab:

* __Wifi__: to change wifi details, in particular IP address of remote client.

* __Sensors__: pin selection etc.

* __Other__: time that device is awake and time that device is asleep (to save battery)

* Press __Save__ button for changes to persist, then __Reboot ESP__ to apply changes