On Raspberry Pi boards, when the CPU is in halt state (powered, but CPU not running), GPIO3 is kept in high state due to an external pull-up resistor. Whenever GPIO3 is pulled low in this state ...

A hardware hacker has solved a problem of powering on 16 Mac minis in a rack, by using a Raspberry Pi to physically press each power switch.. The Mac mini has been used in the past as a compact ...