This tester can be used for NiCd, NiMh, and all flavors of Li-Ion rechargeables.

Use FreeRTOS (simple, easy, robust, & optimised for the Arduino IDE) to reduce the power required for battery or low power applications.

An Arduino powered floppy disk controller and reader/writer for making and writing disk images from and to old AmigaDOS floppy disks.

An Arduino interface to communicate with devices using the LANC (Control-L) protocol such as many Sony and Canon cameras/camcorders.

Use a 3D printed encoder wheel, LED, and 2 photocells to demonstrate how a quadrature encoder works.

DIY Arduino hot air SMD rework station.

An Arduino-based device that can execute brainfuck code.

Cool little Pocket Metal Locator sensitive enough to identify small nails and tacks in wood with four independent search coils and LEDs.

A soft switch with integrated energy monitoring enabling spark free switching for electric vehicles and drones.