Each buzzer consists of an Arduino Pro Mini 3.3 V, a nRF24L01, and of course a big pushbutton on the top.

The creator of the Arduino RF Pro Mini open source development board Etienne, explains a little more about the inspiration behind the project. “ I’ve loved Arduino for years.

Arduino is a company that’s best known for making small, programmable microcontroller boards. But the new Arduino Pro Portenta X8 is a full-fledged, Linux-friendly computer with a compact design.

Arduino Pro 4G Module: Integrated with Portenta family Powered by Quectel Cat.4 modem High-speed data throughput and bandwidth Secure data transfer Global coverage Mini PCIe form factor ...

An Arduino Pro Mini drives an LSM303DLHC compass/accelerometer breakout board and a 12-LED NeoPixel ring. The heading is indicated with a red ‘Pixel between two yellow ones.