Interfacing with microcontroller pins to skin
I have a microcontroller with pins on it, that I'd like to connect to electrical signals that are carried on the surface of the skin via conductive paint. What do you guys suggest is the best way to do this? The signals are being routed from the fingertips to the forearm near the wrist. I'm considering building some electrodes using this method http://www.instructables.com/id/How-to-make-ECG-pads-conductive-gel/ but the pads are too large to put five of them on the wrist close enough, and I don't think they would tolerate motion very well. Signals are active low with a pull-up resistor to 5v. Would microdermal piercings be appropriate for this? I would consider a less invasive solution superior, though.
For more detail, I'm building a bluetooth 'keyboard' that sends keypresses when one touches their finger and thumb together, the thumb is wired to ground, the 4 fingers are connected to 4 different digital IO pins, and the microcontroller, bluetooth module, and battery are housed on an bracelet.