I have built a capacitive 3D controller to control a musical setup as shown in Kyle McDonald Instructable's article (read it here
). I have made plates with sides of 25 cm. The article provides a circuit diagram
as well as an Arduino sketch.
Basically it's functioning but I'd like to improve the setup but my knowledge in electronics is quite limited so any help would be appreciated.
First, the author uses shielded cables but I suspect it doesn't have any effect (the shield doesn't seem to be connected anywhere by the way). am I right ? What kind of circuit can really reduce the capacitive effect of the cable while preserving the one created by the plates and the hand ?
Second, the author writes it is possible to make the circuit more reactive by replacing the 270 kohms resistors with other values. Which ones would you use ? Moreover, the sketch samples sends the data only ten times per second. I'd like to reach a rate at least ten times higher. Is it possible ? How ?
Third, in order to avoid short-circuit with the hand, I'd like to cover the aluminum foils with a non-conductive material. What solution would you recommend ?
Fourth, I am not sure the signals coming to the card have the best possible range before being digitized. In the 25 cm range I have sometimes no more than 8 steps (so it's equivalent to a 3-bits resolution). How can I improve this ?
Thank you in advance for helping.