Hi, I want to build a matrix of reed switches. Will it work properly if there is a metal plate between the magnet and the reed switch? By working properly I mean the magnet will only cause the corresponding reed switch to close and not the surrounding reed switches. Or, perhaps, will the surrounding reed switches be closed because of the metal plate? I'm assuming the magnet can adhere to the metal plate. I hope that makes sense. Any help is appreciated!
Maybe, maybe not. If the metal plate is ferrous it may dissipate the magnetic field and nearby reed switches will be impacted. Lots of factors may influence this... you are probably best to experiment to confirm.
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It depends on the metal - and the thickness.
It depends on the metal.
Also, if the metal plate is ferrous it may divert enough of the magnetic field that the desired reed switch will not close. In that case, Hall-Effect switches or analog sensors may be sensitive enough to sense the magnet through the metal.
Yes, your question does make sense, but I wonder why you have not tested it? The stronger your magnet, the greater it will affect adjacent reed switches. Do you remember how magnetic fields are describe with a picture of iron filings? If not, Google will have a picture like that.
A bar magnet works best with a reed switch. The bar needs to be parallel with the reed switch body. Is this what you are using?
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