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Forums
Engineering
Electrical Engineering
Wiring a capacitance sensor to a controller
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[QUOTE="Merlin3189, post: 5454505, member: 542077"] As far as I can see, your circuit just connects the sig input directly to -ve. So that's the potential it will always see, unless there is a hidden resistance in the -ve connection (there will be, but it's probably too small to be useful.) Connect the sig input direct to the plate, but connect from the plate via a big resistance to whatever DC potential you want on the plate. Then explain: what is going to happen to the plate, and what your sig input is going to look for. It looks to me as if you intended to charge the plate to a certain potential, then detect the change in potential when the capacitance of the plate (to earth) changes. Depeding how fast the capacitance changes, the resistance may have to be quite big because the plate capacitance may be quite small. I don't know how reliable that method is, as I've never tried it. [/QUOTE]
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Engineering
Electrical Engineering
Wiring a capacitance sensor to a controller
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