Spencer Organ has been putting his making skills to use with this Harry Potter-inspired build. Taking his cue from both the Weasley Clock and the Marauders’ Map, he’s taken a Raspberry Pi, an Explorer HAT, an Arduino, some servos and some relays and put the electronics behind a recreation of the Map. The Pi reads, via wi-fi, the presence of devices with known MAC addresses and then activates the arms of the clock to point to the relevant person/position accordingly. It’s an ingenious build and you can read more about it on Spencer’s blog and see a demo video below: