2019-08-27 (Tu) PillarGame

I had some inexpensive reed switches in my inventory, so I tested one to make sure it would work. The reed switch will detect a magnet attached to the cylinder and alert the controller that it is in the HOME position. On any makeshift encoder, this is probably a good idea.
Testing reed switch

After testing the switch, I bent one of the leads around, and it promptly broke the glass. Reed switches use hermetically sealed glass cylinders with iron contacts that attract to one another in the presence of a magnet, and the gas inside keeps the iron from oxidizing. To protect the switches, I potted a pair of them inside a drinking straw and filled it with E6000 adhesive.

The two switches will be wired in parallel so that as long as one of them sees a magnet, the circuit will conduct. This could reduce bouncing and will provide redundancy. If one of the switches breaks and causes a short, it will have to be eliminated.
Making a reed switch assembly

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