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<span class="sidebar-brand-text">GravityMon v1.2.0</span>
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<p class="caption" role="heading"><span class="caption-text">Contents:</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="functionality.html">Functionality</a></li>
<li class="toctree-l1"><a class="reference internal" href="intro.html">Getting started</a></li>
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<li class="toctree-l1"><a class="reference internal" href="formula.html">Create formula</a></li>
<li class="toctree-l1"><a class="reference internal" href="services.html">Service Integration</a></li>
<li class="toctree-l1"><a class="reference internal" href="advanced.html">Advanced Configuration</a></li>
<li class="toctree-l1"><a class="reference internal" href="api.html">REST API</a></li>
<li class="toctree-l1"><a class="reference internal" href="data.html">Data Formats</a></li>
<li class="toctree-l1"><a class="reference internal" href="compiling.html">Compiling the software</a></li>
<li class="toctree-l1"><a class="reference internal" href="contributing.html">Contributing</a></li>
<li class="toctree-l1"><a class="reference internal" href="license.html">Licence</a></li>
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<div class="section" id="welcome-to-gravitymon">
<h1>Welcome to GravityMon<a class="headerlink" href="#welcome-to-gravitymon" title="Permalink to this headline"></a></h1>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This documentation reflects <strong>v1.2.1</strong>. Last updated 2023-02-03</p>
</div>
<div class="section" id="what-is-gravitymon">
<h2>What is GravityMon?<a class="headerlink" href="#what-is-gravitymon" title="Permalink to this headline"></a></h2>
<p>GravityMon is a electronic hydrometer software that can be used to measure gravity and temperature during fermentation of beer and report the progress to a number of external
services. Is uses a gyro to measure the gravity since there is a correlation between gravity an the density of the fluid. Based on the density the hydrometer will float at a different angle.
The graph below is an example on how the fermentation process can be tracked. The graph has been rendered using Fermentrack.</p>
<a class="reference internal image-reference" href="_images/fermentation.png"><img alt="Example fermentation" src="_images/fermentation.png" style="width: 500px;"/></a>
<p>GravityMon is a replacement firmware for the iSpindle and uses the same hardware configuration and is 100% compatible. It
implements a lot of the features that has been requested in the original iSpindle project but never implemented for
various reasons.</p>
<p>The firmware also supports a iSpindle built using an ESP32 which is pin compatible with esp8266, currently there are 3 options that are
supported ESP32-D1 mini, ESP32-C3 mini, ESP32-S2 mini, ESP32 lite (floaty). See <a class="reference internal" href="hardware.html#hardware"><span class="std std-ref">Hardware</span></a>. The more modern hardware will allow better support for SSL and
other memory intensive functions.</p>
<p>I started GravityMon because I like to create software and wanted to do some microcontroller programming. I had done a few
projects based on esp8266 and also started to brew beer so this combination was quite natural.</p>
<p>The hardware design comes from the fantastic iSpindle project so that is not covered in this documentation. For more
information on this topic and function please visit <a class="reference external" href="https://www.ispindel.de">iSpindel Homepage</a> .</p>
<p>My approach to this software is a little different from that the original iSpindle firmware as can be seen in the list of features.</p>
<p>The github repository can be found here; <a class="reference external" href="https://github.com/mp-se/gravitymon">GravityMon on Github</a></p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>I dont take responsibility for any errors or issues caused by the software or hardware.
The software is provided as-is. I will however try my best to fix issues that might occur.</p>
<p>I have tested this software on 40+ brews with good results.</p>
</div>
</div>
<div class="section" id="user-interface-overview">
<h2>User interface overview<a class="headerlink" href="#user-interface-overview" title="Permalink to this headline"></a></h2>
<p>This animation shows how the features of the user interface. Its for an older version but the main features are the same.</p>
<a class="reference internal image-reference" href="_images/gravitymon.gif"><img alt="User Inteface Walkthrough" src="_images/gravitymon.gif" style="width: 800px;"/></a>
</div>
<div class="section" id="software-architecture">
<h2>Software architecture<a class="headerlink" href="#software-architecture" title="Permalink to this headline"></a></h2>
<p>This is a simple overview of the different components that the software contains. The green ones are only active during <cite>configuration mode</cite> in
order to save battery.</p>
<a class="reference internal image-reference" href="_images/software_design.png"><img alt="Software design" src="_images/software_design.png" style="width: 600px;"/></a>
</div>
<div class="section" id="credits-to">
<h2>Credits to<a class="headerlink" href="#credits-to" title="Permalink to this headline"></a></h2>
<p>Ideas to some of these functions have been picked up from discussions in the iSpindle forums. This software uses
the following libraries and without these this would have been much more difficult to achieve:</p>
<ul>
<li><p><a class="reference external" href="https://github.com/jrowberg/i2cdevlib">https://github.com/jrowberg/i2cdevlib</a></p>
<p>This library contains the basic code to interact with the gyro + many more chips.</p>
</li>
<li><p><a class="reference external" href="https://github.com/codeplea/tinyexpr">https://github.com/codeplea/tinyexpr</a></p>
<p>Process the gravity formula and calculate the gravity and various corrections.</p>
</li>
<li><p><a class="reference external" href="https://github.com/graphitemaster/incbin">https://github.com/graphitemaster/incbin</a></p>
<p>Include binary files into the code, used to service html files.</p>
</li>
<li><p><a class="reference external" href="https://github.com/khoih-prog/ESP_DoubleResetDetector">https://github.com/khoih-prog/ESP_DoubleResetDetector</a></p>
<p>Can detect if the reset button is pressed twice, is used to enter WIFI config mode.</p>
</li>
<li><p><a class="reference external" href="https://github.com/khoih-prog/ESP_WiFiManager">https://github.com/khoih-prog/ESP_WiFiManager</a></p>
<p>Configure wifi settings.</p>
</li>
<li><p><a class="reference external" href="https://github.com/thijse/Arduino-Log">https://github.com/thijse/Arduino-Log</a></p>
<p>Logging library for handling different loglevels and configure what sent over the serial.</p>
</li>
<li><p><a class="reference external" href="https://github.com/bblanchon/ArduinoJson">https://github.com/bblanchon/ArduinoJson</a></p>
<p>Json parser/creator used in configuration files and APIs</p>
</li>
<li><p><a class="reference external" href="https://github.com/PaulStoffregen/OneWire">https://github.com/PaulStoffregen/OneWire</a></p>
<p>Communication library used for interacting with temperature sensor.</p>
</li>
<li><p><a class="reference external" href="https://github.com/milesburton/Arduino-Temperature-Control-Library">https://github.com/milesburton/Arduino-Temperature-Control-Library</a></p>
<p>Interaction with the DS18B20 sensor</p>
</li>
<li><p><a class="reference external" href="https://github.com/Rotario/arduinoCurveFitting">https://github.com/Rotario/arduinoCurveFitting</a></p>
<p>Create the gravity formula.</p>
</li>
<li><p><a class="reference external" href="https://github.com/256dpi/arduino-mqtt">https://github.com/256dpi/arduino-mqtt</a></p>
<p>Library for sending data to mqtt based on lightweight mqtt implementation.</p>
</li>
<li><p><a class="reference external" href="https://graphjs.com/">https://graphjs.com/</a></p>
<p>Render the graphs in the UI.</p>
</li>
<li><p><a class="reference external" href="https://getbootstrap.com/">https://getbootstrap.com/</a></p>
<p>CSS templates for the web page.</p>
</li>
<li><p><a class="reference external" href="https://github.com/lorol/LITTLEFS">https://github.com/lorol/LITTLEFS</a></p>
<p>LittleFS library for ESP32 framework 1.x</p>
</li>
<li><p><a class="reference external" href="https://github.com/h2zero/NimBLE-Arduino">https://github.com/h2zero/NimBLE-Arduino</a></p>
<p>Bluetooth library for ESP32 framework 1.x</p>
</li>
<li><p><a class="reference external" href="https://github.com/spouliot/tilt-sim">https://github.com/spouliot/tilt-sim</a></p>
<p>Excellent project for simulating a tilt device.</p>
</li>
</ul>
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<p class="caption" role="heading"><span class="caption-text">Contents:</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="functionality.html">Functionality</a><ul>
<li class="toctree-l2"><a class="reference internal" href="functionality.html#the-main-features">The main features</a></li>
<li class="toctree-l2"><a class="reference internal" href="functionality.html#battery-life">Battery life</a></li>
<li class="toctree-l2"><a class="reference internal" href="functionality.html#performance">Performance</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="intro.html">Getting started</a><ul>
<li class="toctree-l2"><a class="reference internal" href="intro.html#step-1-flash-the-device">Step 1 - Flash the device</a></li>
<li class="toctree-l2"><a class="reference internal" href="intro.html#step-2-setup-wifi">Step 2 - Setup WIFI</a></li>
<li class="toctree-l2"><a class="reference internal" href="intro.html#step-3-configuration">Step 3 - Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="intro.html#step-4-completed">Step 4 - Completed</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="installation.html">Installation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="installation.html#brewflasher">Brewflasher</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#esptool-esp8266">Esptool (esp8266)</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#ispindel-esp8266">iSpindel (esp8266)</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#updating-firmware">Updating firmware</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#serial-monitoring">Serial Monitoring</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#configuring-wifi">Configuring WIFI</a></li>
<li class="toctree-l2"><a class="reference internal" href="installation.html#finding-the-device-adress">Finding the device adress</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="configuration.html">Configuration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="configuration.html#status">Status</a></li>
<li class="toctree-l2"><a class="reference internal" href="configuration.html#id1">Configuration</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="releases.html">Releases</a><ul>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v1-2-1">v1.2.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v1-2-0">v1.2.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v1-1-1">v1.1.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v1-1-0">v1.1.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v1-0-0">v1.0.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-9-0">v0.9.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-8-0">v0.8.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-7-1">v0.7.1</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-7-0">v0.7.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-6-0">v0.6.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-5-0">v0.5.0</a></li>
<li class="toctree-l2"><a class="reference internal" href="releases.html#v0-4-0">v0.4.0</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="hardware.html">Hardware</a><ul>
<li class="toctree-l2"><a class="reference internal" href="hardware.html#ispindle-based-on-esp8266">iSpindle based on esp8266</a></li>
<li class="toctree-l2"><a class="reference internal" href="hardware.html#ispindle-based-on-esp32">iSpindle based on esp32</a></li>
<li class="toctree-l2"><a class="reference internal" href="hardware.html#floaty-hydrometer-diy-based-on-esp32-lite">Floaty Hydrometer DIY based on esp32 lite</a></li>
<li class="toctree-l2"><a class="reference internal" href="hardware.html#hardware-extensions">Hardware extensions</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="formula.html">Create formula</a></li>
<li class="toctree-l1"><a class="reference internal" href="services.html">Service Integration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="services.html#brewfather">Brewfather</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#fermentrack">Fermentrack</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#ubidots">UBIdots</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#home-assistant">Home Assistant</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#brewer-s-friend">Brewers Friend</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#brewspy">Brewspy</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#thingspeak">Thingspeak</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#blynk-io">Blynk.io</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#brewpiless">Brewpiless</a></li>
<li class="toctree-l2"><a class="reference internal" href="services.html#brewblox">BrewBlox</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="advanced.html">Advanced Configuration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="advanced.html#format-editor">Format editor</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="api.html">REST API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-config">GET: /api/config</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-device">GET: /api/device</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-status">GET: /api/status</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-config-formula">GET: /api/config/formula</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-config-advanced">GET: /api/config/advanced</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#post-api-config-advanced">POST: /api/config/advanced</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-clearwifi">GET: /api/clearwifi</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-factory">GET: /api/factory</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#get-api-test-push">GET: /api/test/push</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#post-api-config-device">POST: /api/config/device</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#post-api-config-push">POST: /api/config/push</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#post-api-config-gravity">POST: /api/config/gravity</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#post-api-config-hardware">POST: /api/config/hardware</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#post-api-config-formula">POST: /api/config/formula</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#calling-the-api-s-from-python">Calling the APIs from Python</a></li>
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<li class="toctree-l1"><a class="reference internal" href="data.html">Data Formats</a><ul>
<li class="toctree-l2"><a class="reference internal" href="data.html#http-post-ispindle-format">HTTP Post, iSpindle format</a></li>
<li class="toctree-l2"><a class="reference internal" href="data.html#http-get">HTTP Get</a></li>
<li class="toctree-l2"><a class="reference internal" href="data.html#influx-db-v2">Influx DB v2</a></li>
<li class="toctree-l2"><a class="reference internal" href="data.html#mqtt">MQTT</a></li>
<li class="toctree-l2"><a class="reference internal" href="data.html#version-json">version.json</a></li>
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<li class="toctree-l1"><a class="reference internal" href="compiling.html">Compiling the software</a><ul>
<li class="toctree-l2"><a class="reference internal" href="compiling.html#tools">Tools</a></li>
<li class="toctree-l2"><a class="reference internal" href="compiling.html#code-formatting">Code Formatting</a></li>
<li class="toctree-l2"><a class="reference internal" href="compiling.html#targets">Targets</a></li>
<li class="toctree-l2"><a class="reference internal" href="compiling.html#serial-debugging-on-battery">Serial debugging on battery</a></li>
<li class="toctree-l2"><a class="reference internal" href="compiling.html#source-structure">Source structure</a></li>
<li class="toctree-l2"><a class="reference internal" href="compiling.html#options">Options</a></li>
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<li class="toctree-l1"><a class="reference internal" href="contributing.html">Contributing</a><ul>
<li class="toctree-l2"><a class="reference internal" href="contributing.html#design-goals">Design goals</a></li>
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<li class="toctree-l1"><a class="reference internal" href="license.html">Licence</a></li>
<li class="toctree-l1"><a class="reference internal" href="troubleshooting.html">Troubleshooting</a><ul>
<li class="toctree-l2"><a class="reference internal" href="troubleshooting.html#log-errors">Log errors</a></li>
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<li class="toctree-l1"><a class="reference internal" href="q_and_a.html">Q &amp; A</a><ul>
<li class="toctree-l2"><a class="reference internal" href="q_and_a.html#user-interface-does-not-render-correctly">User interface does not render correctly</a></li>
<li class="toctree-l2"><a class="reference internal" href="q_and_a.html#data-is-not-populated-in-the-fields">Data is not populated in the fields</a></li>
<li class="toctree-l2"><a class="reference internal" href="q_and_a.html#my-device-is-no-going-in-to-sleep-after-fully-charged">My device is no going in to sleep after fully charged</a></li>
<li class="toctree-l2"><a class="reference internal" href="q_and_a.html#my-device-reports-a-temperature-of-273c-or-491f">My device reports a temperature of -273C or -491F</a></li>
<li class="toctree-l2"><a class="reference internal" href="q_and_a.html#calibration-error-unable-to-find-a-valid-formula">Calibration error (unable to find a valid formula)</a></li>
<li class="toctree-l2"><a class="reference internal" href="q_and_a.html#how-can-i-filter-data-on-influxdb-without-needing-to-know-the-time-range">How can I filter data on influxdb without needing to know the time range</a></li>
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<div class="section" id="indices-and-tables">
<h3>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline"></a></h3>
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<li><a class="reference internal" href="#">Welcome to GravityMon</a><ul>
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