I would like to achieve something along the lines of a snap on magnetic connector in my pcb design in order set simple four bit addresses. I'd like to have four solder-jumper type pads on the board that can either be turned on or off with a snap on magnet. The idea is that different connectors have varying arrangements of magnets so if a magnet lines up with a jumper on the board it will read as a 1 and if not it will read as a 0 ( assuming the magnetic connection closes the jumper ). However I'm aware that copper is essentially not magnetic so my question is; are there such things as SMD steel pads that a magnet would stick to? Also, am I being an idiot? Would this just interfere with the circuit and mess everything up?

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    \$\begingroup\$ I had a professor who tried doing this in a power electronics lab class. Many hours of troubleshooting went down the drain only to find that the magnetic connections were junk. I know they exist, but beware that they may induce headaches. \$\endgroup\$ – calcium3000 Jan 12 '17 at 20:37
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    \$\begingroup\$ Why would you like to use magnets, as opposed to DIP switches, or some other configuration input? \$\endgroup\$ – Daniel Jan 12 '17 at 20:37
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    \$\begingroup\$ Yep fasteners, or machine an SMD part yourself. Or find something off the shelf. Regardless questions like this are off topic electronics.stackexchange.com/help/how-to-ask meta.stackexchange.com/questions/158809/… \$\endgroup\$ – laptop2d Jan 12 '17 at 20:38
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    \$\begingroup\$ I'm not sure I understand what you described. But maybe you're looking for reed switches. Basically, just a switch operated by a magnet, is that it? However, the magnet would certainly not stick to it. It will just operate it, so you need additional elements to ensure locking (just additional magnets on both sides?). \$\endgroup\$ – dim Jan 12 '17 at 20:41
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    \$\begingroup\$ Logic, using low voltages, is HARD to switch with moving parts. Reed switches and magnets will work, but the applied magnets will have to be kept distant from each other, and will occasionally stick to a tool and come loose. Most folk use 0.1" header pins, with jumpers. \$\endgroup\$ – Whit3rd Jan 12 '17 at 21:59

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