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<!DOCTYPE html>
<html class="no-js" lang="en">
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<link href="https://jomjol.github.io/AI-on-the-edge-device-docs/External-LED/" rel="canonical"/>
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<title>External LED - AI on the Edge Device</title>
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Skip to content
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AI on the Edge Device
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External LED
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Getting Started
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Getting Started
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Welcome
</span>
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<a class="md-nav__link" href="../Installation/">
<span class="md-ellipsis">
Installation
</span>
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Initial Setup
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Hardware Compatibility
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<a class="md-nav__link" href="../Best-Practice/">
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Best Practice
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<a class="md-nav__link" href="../FAQs/">
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Frequently Asked Questions
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Configuration
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Configuration
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<ul class="md-nav__list" data-md-scrollfix="">
<li class="md-nav__item">
<a class="md-nav__link" href="../Reference-Image/">
<span class="md-ellipsis">
Reference Image
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Alignment/">
<span class="md-ellipsis">
Alignment References
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../ROI-Configuration/">
<span class="md-ellipsis">
ROIs (Regions of Interest)
</span>
</a>
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<li class="md-nav__item">
<a class="md-nav__link" href="../Configuration/">
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Graphical Configuration
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Choosing-the-Model/">
<span class="md-ellipsis">
Model Selection
</span>
</a>
</li>
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<a class="md-nav__link" href="../ota/">
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Over-The-Air (OTA) Update
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Advanced
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Advanced
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<a class="md-nav__link" href="../Parameters/">
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Parameters
</span>
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</li>
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Integration into Home Assistant
</span>
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External LED
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External LED
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Table of contents
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<li class="md-nav__item">
<a class="md-nav__link" href="#1-hardware-installation-of-the-led-stripe">1.1
<span class="md-ellipsis">
1. Hardware installation of the LED stripe
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="#2-software-configuration">1.2
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2. Software configuration
</span>
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<li class="md-nav__item">
<a class="md-nav__link" href="../data-logging/">
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Data Logging
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<li class="md-nav__item">
<a class="md-nav__link" href="../rolling-installation/">
<span class="md-ellipsis">
Living on the Edge
</span>
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</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../Watermeter-specific-analog---digital-transition/">
<span class="md-ellipsis">
Analog/Digital Transition on Water Meters
</span>
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</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../collect-new-images/">
<span class="md-ellipsis">
Collect images to improve the models
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<a class="md-nav__link" href="../Learn-models-with-your-own-images/">
<span class="md-ellipsis">
Learn a model with your own images
</span>
</a>
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<li class="md-nav__item">
<a class="md-nav__link" href="../Correction%20Algorithm/">
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Correction Algorithm
</span>
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<a class="md-nav__link" href="../Neural-Network-Types/">
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Neural Network Types
</span>
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<a class="md-nav__link" href="../Additional-Information/">
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Additional Information
</span>
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<a class="md-nav__link" href="../New-Releases-Notification/">
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Notification about new Releases
</span>
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<a class="md-nav__link" href="../prometheus-openmetrics/">
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Prometheus/OpenMetrics
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Troubleshooting
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Troubleshooting
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<li class="md-nav__item">
<a class="md-nav__link" href="../Error-Codes/">
<span class="md-ellipsis">
Reduced webinterface (error codes)
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../StatusLED-BlinkCodes/">
<span class="md-ellipsis">
Board status LED (blink codes)
</span>
</a>
</li>
<li class="md-nav__item">
<a class="md-nav__link" href="../WLAN-disconnect-reason/">
<span class="md-ellipsis">
WLAN disconnect reasons
</span>
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Often observed issues
</span>
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<a class="md-nav__link" href="../Frequent-Reboots/">
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Basic hardware/config issues
</span>
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Demo mode
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Quick Links
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Quick Links
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<a class="md-nav__link" href="https://github.com/jomjol/AI-on-the-edge-device/releases">
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Releases
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<a class="md-nav__link" href="https://jomjol.github.io/AI-on-the-edge-device/index.html">
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Web Installer/Console
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</a>
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<li class="md-nav__item">
<a class="md-nav__link" href="https://github.com/jomjol/AI-on-the-edge-device/issues">
<span class="md-ellipsis">
Create an Issue
</span>
</a>
</li>
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<a class="md-nav__link" href="https://github.com/jomjol/AI-on-the-edge-device/discussions">
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Join a Discussion
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API's
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API's
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REST API
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<a class="md-nav__link" href="../MQTT-API/">
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MQTT API
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<a class="md-nav__link" href="../Influx-DB/">
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Influx DB
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Webhook
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Development
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Development
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Build the Project
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<li class="md-nav__item">
<a class="md-nav__link" href="../Upload-files-by-script/">
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Scripted File Upload
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Testing Option for VSCode
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<a class="md-nav__link" href="../Release-creation/">
<span class="md-ellipsis">
Preparing for Release
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<a class="md-nav__link" href="#1-hardware-installation-of-the-led-stripe">1.1
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1. Hardware installation of the LED stripe
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<a class="md-nav__link" href="#2-software-configuration">1.2
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2. Software configuration
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<h1 id="external-led"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.</span> External LED</h1>
<p>The internal flash LED is very close to the camera axis. This results in reflection, especially in case of flat glass surfaces such as for power meters.
To circumvent this problem, it is now possible to control external LEDs, which than can be places somewhere else in the setup. As not simples LEDs are used, but RGB LEDs with a digital interface like WS2812 not only the position, but also the color and intensity of the illumination can now be adjusted. The following image shows a direct comparison of the "old" internal flash LED and two off axis LEDs.</p>
<p><img src="https://raw.githubusercontent.com/jomjol/ai-on-the-edge-device/master/images/intern_vs_external.jpg" width="700"/></p>
<p>There is also a new <a href="https://www.thingiverse.com/thing:5028229">meter adapter</a> available. This has two features: designed for <strong>small clearings</strong> in front of the meter and prepared for <strong>WS2812 LEDs</strong>.</p>
<p><img src="https://raw.githubusercontent.com/jomjol/ai-on-the-edge-device/master/images/Power_Meter_Mounted.jpg" width="500"/></p>
<h2 id="1-hardware-installation-of-the-led-stripe"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.1</span> 1. Hardware installation of the LED stripe</h2>
<p>The control line of the LED stripe is connected with a 470 Ohm resistor to the GPIO12.
For power supply stabilization a capacitor between 5V and ground is recommended. Here a 470µF polymer capacitor is used. As a power supply a 5V from the ESP32 is used like in the following wiring.</p>
<p><img src="https://raw.githubusercontent.com/jomjol/ai-on-the-edge-device/master/images/install_external_led.jpg" width="500"/> </p>
<h2 id="2-software-configuration"><span class="enumerate-headings-plugin enumerate-heading-plugin">1.2</span> 2. Software configuration</h2>
<p>The handling of the WS2812 LED controller needs some other libraries, therefore it is controlled within a dedicated section called <code>GPIO Settings</code>. The external LED stripe is connected to GPIO12. After activating the "GPIO Settings" section, the internal flash is per default disabled. In order to activate the external LED, you need to activate <code>GPIO 12 state</code> and select <code>"extern flash light ws281x ..."</code>. </p>
<p><img src="https://raw.githubusercontent.com/jomjol/ai-on-the-edge-device/master/images/external_GPIO_settings.jpg" width="700"/> </p>
<table>
<thead>
<tr>
<th>Parameter</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td>LED-Type</td>
<td>There are several types of controller implemented: WS2812(B), WS2813, SK6812</td>
</tr>
<tr>
<td>Numbers of LED</td>
<td>Number of LEDs on the LED stripe</td>
</tr>
<tr>
<td>LED Color</td>
<td>The color and intensity can be controlled directly by a red/green/blue value, each within the range from 0 (off) to 255 (full)</td>
</tr>
</tbody>
</table>
<p>Enabling the GPIO settings automatically disables the flash LED. Therefore you can enable it here manually by checking GPIO4 and choose <code>"build-in led flash light"</code>. It is not recommended to use both illumination parallel. </p>
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