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InfluxDB
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I was looking at these the other day - in the process of browsing around the subject I found this maker-project to create custom ones:
https://github.com/scottbez1/splitflap
Fastmail has one of these in the entryway to our Philadelphia office. It's been a lot of fun playing with the API — so far, we've made an integration with our company's chatbot [1] to manage "board tokens" [2] which allow folks to post to it (without clobbering each other's designs); a web UI to create designs which can be posted using the bot; and a 'vesta show' command, which creates a composite image of each cell of the board to represent the current board state (e.g. [3]) so that our colleagues in Australia and elsewhere can participate.
It's a lot of fun!
[1] https://github.com/fastmail/synergy
[2] Token in the "arcade token" sense, not "authorization token"
[3] https://dev.joewoods.dev/img/vesta-show-20211124.png — note my sloppy normalization of the brightness of the cells
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