BallotBox Laser Trip Wire Case
thingiverse
This is a raspberry pi tripwire setup that senses when something passes through the center. It was designed for use in a DIY ballot box that makes a noise whenever a ballot is dropped in but it could easily be adjusted to be used on a mail slit or many other things. Get creative with it! Link to the Github: https://github.com/spacemuggle/BallotBoxPi This is a work in progress so expect the code and design to change!
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