Cap Sense and proximity

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i'm working on art installation project. have large antenna , trying use capacitive sense detect movement within space - can help? i'm getting readings - using cap sense library 20mohm resistor - when foil loop attached touched - i'm hoping able extend sensitivity of sketch detect proximity can't seem find way.

i test different metals i.e. steel - copper - aluminium - settle 1 generates best data _ appreciated!



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