I am working on a project with T3 that will ultimately be handheld and battery-powered in a plastic case. I'd like to add a capacitive button to the case via the T3's TouchRead pin/function, and I'm having trouble figuring out how/where to place the ground plane to enable true capacitive sensing. When this device is connected via USB to a computer the sensing works pretty well (since ground eventually makes it to the power line's ground--Paul noted this in an earlier post). However, I don't know how to avoid floating input when the user is holding the device, preferably without exposed metal.
Any suggestions? I'm far from an EE and exhausted my own knowledge once I plugged in the wire...
Thanks!
Dave
Any suggestions? I'm far from an EE and exhausted my own knowledge once I plugged in the wire...
Thanks!
Dave