We tested a whole bunch of materials with mixed results. We had some issues with Processing, so we just ran the Arduino board with our simple high/medium/low output to test the responsiveness of a variety of metal sheets and meshes. We're still trying to calibrate our system for predictable input. In the meantime, we're meeting with a professor in the Engineering Department here at Columbia to get some advice. Here are the tests:
A really long (6') piece of flashing:
A metal clip-lamp shade:
We were able to get roughly the same results (a decent hi/med/lo response) from each material by varying the resistor - the resistor matters a lot, which we think has to do with how our pre-packaged measuring function works. The size of the material doesn't seem to matter that much, nor does any insulating material over it - but we're using the same alligator-clipped lead wires so the spacing and wire length hasn't changed much among the setups.
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