We love the design of this calculated doom clock, and it’s quite simple inside — an Arduino Pro Mini outputs the graph on an 2.9″ e-paper display, and both are powered with a 5.5 V solar panel.

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.

The main parts are an Arduino Pro Mini clone, a BMP180 sensor and a Nokia 5110 LCD module. ... He wrapped it all up by enclosing the hardware in a custom laser cut acrylic box.