This is what I’ve been working on for last months at #CVUTFEL – electronic door sign for classrooms. 10.2" e-ink display, ESPink #ESP32 board from #Laskakit, battery (for some), a custom case, firmware and control server. Receives images via MQTT, sends telemetry back. #IoT

The case was designed in FreeCAD and printed it on Prusa MK3S and Prusa Core One. Firmware is built on Arduino SDK with patched GxEPD2_4G lib. Control server is written in TypeScript and runs on NodeJS. It renders screens to 2-bit grayscale PNG and sends via Mosquitto.

The price is ~115 EUR of you order the e-ink display and battery directly from China.

Most of this is my work, from the hardware up to the control server and also monitoring. It’s a very interesting project, a nice change from what I normally do because it’s a physical object. :)

This batch is 32 pieces and they will be installed mainly in Dejvice this month.