Building a OnAir sign

I wanted to design a portable sign, which tells my fellows, when there is an open microphone or camera and an ongoing online meeting.

Portabilty is done with a 18650 lithium battery, which is loaded via USB. I use a TC4056A  Lithium Battery Charger. The Wemos D1 mini runs WLED. The 10x WS2812 LEDs are behind a diffusor, which light up the sign from the back. Instead of loading it via the USB I could also add a 6V solar panel.

The software is configured to use MQTT and the OpenHAB2 runs a scene, which I can trigger via Apple Homekit just by saying “OnAir”.

OnAir Overview