Hi. I want to build a nice musical keyboard using a metallic 15x15=225 grid of squares (they come from a floor tile :) ). I need to recognize a pressure on multiple keys. Touch sensing is the most obvious solution and here comes Freescale's MPR121 (12 touch sensors). My question: Any alternative for such a big number of buttons? I would like to avoid a batch of ICs as much as possible. Thank you Alex
Touch sensing is the most obvious solution
Does it? How does it cope with pressure?
Also capacitave touch sensors tend to interfere with each other when you have more than one package so getting your number of keys I guess will be almost impossible.
Any alternative for such a big number of buttons?
The conventional way would be to use a switch matrix although you might have to get inventive to get any pressure information.
Sounds like a way too ambitious project, I wouldn't try it.
I really thought it was easier. Thank you for your hint to search something easier to do with my life :-) That's already a very wise answer.
Sounds like a touch screen as on a tablet PC. How much "multi"-touch were you proposing?