For the uninitiated, a microcontroller is an integrated circuit that sees more ... of flashing an OS onto a USB drive/SD card, you’ll need to program the Arduino board by connecting it to ...

[Joel] has a video of his screen that shows him pulling off in-circuit SD card reading and writing. You can check that out below.

CHDK can be run from the SD card, so no permanent modifications ... device runs off of an ATMega328p with Arduino. It operates from a 9V battery. The circuit contains an infrared receiver and ...