Simple project: Escape room switch locks.
A customer of mine manages a few Escape rooms in Ljubljana, so he occasionally asks me to develop a problem for him.
Recently he needed two simple locks, preferably electronic and they have to be one red, the other blue.
So, I proposed two simple solutions, no programming needed, because that would have made the lock much more expensive.
https://youtu.be/39KK4QuF3MU
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