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<h1 id="frequent-reboots">Frequent Reboots</h1>
<p>There are several types of reboots. To get a deeper insight turn on the logging:</p>
<ol>
<li>Internal logging (<code>config.ini</code>)</li>
<li>Serial log of the UART interface (same as for flashing the firmware)</li>
</ol>
<p>There are two principle types of reboots</p>
<ol>
<li>Random reboots (always different timing and situation)</li>
<li>Permanent Reboots always at the same time</li>
</ol>
<hr />
<h3 id="random-reboots">Random reboots</h3>
<p>Random reboots have two reasons: overload during HTML access and unstable system</p>
<p>In general: there are several mechanisms in the firmware (like saving previous values), to have a "smooth" reboot without too many notable disturbance.</p>
<h5 id="overload-during-html-access">Overload during HTML access</h5>
<p>If you frequently access the web server over HTML requests, the firmware tends to reboot. This especially happens during the first run and when the ESP32 is busy with the digitization flow. </p>
<p>The reason for this are running out of memory during a flow, minor memory leakage in combination with missing error handling.</p>
<p>There is noting you can do about this kind of reboot, beside two thing:</p>
<ol>
<li>Support the firmware development with improved and tested part of code</li>
<li>Be patient :-)</li>
</ol>
<h5 id="unstable-system">Unstable system</h5>
<p>If your system is sometimes running smoothly over several runs and sometimes reboots obviously randomly, you have an partially unstable device. </p>
<p>You can check this in the standard log file on the SD card:</p>
<pre><code>2021-12-26T06:34:09: task_autodoFlow - round done
2021-12-26T06:34:09: CPU Temperature: 56.1
2021-12-26T06:38:00: task_autodoFlow - next round - Round #23
</code></pre>
<p>Here you see, that the round #23 is starting, so obviously there were no reboots in the last 22 rounds. There is hardware (ESP32CAM), where only 2-3 stable rounds are possible and others, where way more than 100 rounds without any reboots is possible.
There is noting you can do about it, beside testing different hardware.</p>
<hr />
<h3 id="permanent-reboots">Permanent reboots</h3>
<p>Permanent reboots at the same situation during the flow has a systematic problem either in the hardware or the configuration. It usually happens during the first run as there all needed parts of the firmware have been loaded for the first time.</p>
<p>To find the reason mostly the serial log of the UART interface from the startup until the reboots is very helpful. It can be stored using the USB / UART interface - the same as for flashing the firmware - and logging the serial output of the ESP32.</p>
<p>Possible problems:</p>
<ul>
<li>
<p>SD card</p>
</li>
<li>
<p>PSRAM too low</p>
</li>
<li>Configuration missing</li>
</ul>
<h5 id="sd-card-problems">SD card problems</h5>
<p>The ESP32CAM is a little bit "picky" with the supported SD cards. Due to the limited availability of GPIOs the SD card can only be accessed via 1-wire mode. Therefore not all SD cards are supported. Several error cases can happen:</p>
<h6 id="no-sd-card">No SD card</h6>
<p>Easy to detect: fast blinking red LED directly after startup, no reaction of the web server etc. at all</p>
<h6 id="sd-card-not-supported-at-all">SD card not supported at all</h6>
<p>Error message of no detectable SC card in the log file. <strong>Normal looking</strong> log for a 16GB SD card is like this:</p>
<pre><code>09:38:25.037 -&gt; I (4789) main: Using SDMMC peripheral
09:38:25.037 -&gt; I (4789) main: Using SDMMC peripheral
09:38:25.138 -&gt; Name: SC16G
09:38:25.138 -&gt; Type: SDHC/SDXC
09:38:25.138 -&gt; Speed: 20 MHz
09:38:25.138 -&gt; Size: 15193MB
</code></pre>
<p>Otherwise there is some error message.</p>
<h6 id="sd-card-recognized-but-not-supported">SD card recognized but not supported</h6>
<p>This is the most annoying error. The SD card is detected, but the files cannot be read. Most probably this results in a problem with the WLAN connection, as the first file needed is the <code>wlan.ini</code> in the root directory.</p>
<h5 id="psram-too-low">PSRAM too low</h5>
<p>In order to work, there are 4 MB of PSRAM necessary. Normally the ESP32CAM is equipped with 8 MB, whereof only 4 MB can be used effectively.
Sometimes, there is hardware, where only 2 MB of PSRAM is present - <strong>even if you have bought a 8 MB module</strong></p>
<p>You can identify the amount of PSRAM in the serial log file:</p>
<pre><code>09:38:21.224 -&gt; I (881) psram: This chip is ESP32-D0WD
09:38:21.224 -&gt; I (885) spiram: Found 64MBit SPI RAM device
09:38:21.224 -&gt; I (890) spiram: SPI RAM mode: flash 40m sram 40m
09:38:21.224 -&gt; I (895) spiram: PSRAM initialized, cache is in low/high (2-core) mode.
</code></pre>
<p>Here you see 64MBit (= 8MByte) - which is okay. False reading would be: 16MBit</p>
<p>The error in the SD log file is typically related with the taking of the image (tbd) as the first time, the system is running out of memory is usually, when it tries to transfer an image from the camera to the PSRAM.</p>
<p>There is nothing to do, than to buy a new ESP32CAM with <strong>really</strong> 64MBit of PSRAM.</p>
<h5 id="configuration-missing">Configuration missing</h5>
<p>There are several files needed during on run cycle. If one of this is missing, the firmware is missing information and tends to reboot due to missing error management:</p>
<ul>
<li>
<p><code>/wlan.ini</code></p>
</li>
<li>
<p><code>/config/config.ini</code></p>
</li>
<li>
<p><code>/config/XXXXX.tflite</code> (1 time for analog and 1 time for digital)</p>
</li>
</ul>
<p>where XXXXX is the file name, that is written in the <code>config.ini</code></p>
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