Fencing scoreboard on a Pi, and in a phone
Not every experiment here is a GIS. This one is a piste clock: left and right scores, a three-minute period, the weapon, and as little else as will fit on a hall monitor.
The machine under the desk is a first-generation Raspberry Pi in a clear case, HDMI to an Acer display. The board shows Piste 1, foil, 0–0, three minutes on the clock. The same layout is what you want the hall to see; the interesting part was driving it from something you can carry.
The phone is pointing a browser at localhost:8080. Scores have plus and minus buttons, there is a Start and a Stop, and the weapon still reads Foil. That is the referee’s view of the same clock: a small local web page, no app store, no server further away than the Pi itself.
The pairing is the point. A cheap ARM board owns the big screen; any phone on the same network can run the bout. It is also a reminder that a web page will still open from a local address, which is how this rebuilt site is meant to be used.