On Air Sign With Rgb Leds Controlled By Alexa

About the project

I built this sign out of Walnut and Curly Maple and some RGB LEDs that I can control via Amazon Alexa with an esp32.

Project info

Difficulty: Moderate

Platforms: ArduinoNodeMCUWindowsEspressif

Estimated time: 2 days

License: Apache License 2.0 (Apache-2.0)

Items used in this project

Hardware components

N-Channel Power Mosfet TO-220 N-Channel Power Mosfet TO-220 x 1
RGB 5050 LED strip RGB 5050 LED strip x 1
thingSoC ESP32 WiFi Module thingSoC ESP32 WiFi Module x 1

Software apps and online services

Arduino IDE Arduino IDE
Windows Windows


I built this On Air sign to help let my family know when pants are required to enter the room. I made the CNC out of walnut and maple. I cut the sign part on my CNC and put white acrylic behind it to defuse the RGB LEDs.

I can turn the sign on or off via voice commands to Amazon Alexa. And finally last week I figured out a way to automatically turn on it by writing a C# app to detect a Zoom, WebEx, or MS Teams Meeting by monitoring UDP.

This video shows my full build process for making the sign.

And this video shows how I wrote the C# app to detect a Zoom, WebEx, or MS Teams Meeting by monitoring UDP.

This video walks through the woodworking part of the project. It shows how I built the case out of walnut and maple. 

Schematics, diagrams and documents

Circuit Diagram


Arduino Code

Windows Code

Windows App that monitors UDP to detect Zoom, WebEx, Discord and MS Teams meetings


Photo of MakerAtPlay


I enjoy making things. All kinds of things from woodworking and electronics to programming. This all started when I got a Commodore VIC 20 for Christmas when I was 10 years old.


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