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January 20, 2017 AT 5:00 am

Harry Potter and the Real-Life Weasley Clock #piday #raspberrypi @Raspberry_Pi

via Instructables

We posted a different build of this recently, but this one’s got real Potterstyle. To remind you, here’s a description:

Mrs. Weasley glanced at the grandfather clock in the corner. Harry liked this clock. It was completely useless if you wanted to know the time, but otherwise very informative. It had nine golden hands, and each of them was engraved with one of the Weasley family’s names. There were no numerals around the face, but descriptions of where each family member might be. “Home,” “school,” and “work” were there, but there was also “traveling,” “lost,” “hospital,” “prison,” and, in the position where the number twelve would be on a normal clock, “mortal peril.”

From Pat Peters (what a Harry Potterish name!) Instrutables build description:

This project is an Internet of Things Location Clock (or Whereabouts Clock or Weasley Clock). Rather than having 2 hands that give you the time of day, this clock has a hand for each member of your family or group, and displays the hand over wherever that person is. My clock, for example, has 2 hands (one for me and one for my wife) and shows locations for Home, School, my Parent’s house, our favorite bar, the opera house (my wife and I volunteer for the opera), etc.

This Location clock works through a raspberry pi, that subscribes to an MQTT broker that our phone’s publish events to. Our phone (running the OwnTracks GPS app) sends a message to the broker anytime we cross into or out of one of our waypoints that we have set up in OwnTracks, which then triggers the raspberry pi to run a servo that moves the clock hand to show our location.

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