What?
Program an Arduino Uno to act as a USB keyboard that automatically presses the F1 key every 5 seconds.
I'm using this to automate occasional reboots of a server that shows a BIOS error with "Press F1 to continue" every time it reboots.
Based on http://mitchtech.net/arduino-usb-hid-keyboard/.
Requires reflashing the USB controller on the Arduino with a special firmware
(on my Arduino, this is an ATmega16U2 chip). See also the
relevant Arduino docs
and
reflash.sh
in this respository.