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I have acquired a programmable coin acceptor! Turns out they're pretty cheap... hoping to make a fun project out of this for the next hacker camp
(The current idea bouncing around in my head is some sort of scavenger hunt involving finding coins)
@joepie91 washers might be a cheap solution, if you need to source them in bulk? You could spray paint them with a stencil, or even laser engrave, if you have access to that.
@shine Hmm. That might work as a backup, though they wouldn't really be something that people are unlikely to have their own stash of at a hacker camp (in terms of material properties, which the acceptor looks at) and the consistency would be a challenge
I don't think it'll work with plastic coins though, so I may need to find a source for metal non-money coins somewhere