Required to trigger reed switches for IOT (Meross) garage door openers. Meross's magnet was weak, and any deviation in the car's position with the door closed periodically signaled that the door was still open. I installed two "pillars" (about 4 or 5 magnets each) on a carriage (one pillar at each end) with a reed switch in between (flush with the ceiling drywall) to create a stronger magnetic field. A column went north; the other column faced south; maybe it doesn't matter. The magnets were so strong that I didn't need any glue or fasteners. Now I 100% feel the door closing. There are still over 100 units left for other projects!
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