Skin Conductivity Switch
I used a couple of small bipolar transistors to amplify the modest current that 5 volts can push through a hand. Its tactile sensitivity depends on how sweaty your hands are.
I’m an airhead designer with no programming experience, so there’s nothing special on that front. I interpreted the project description as literally as I could to keep things simple.
Here are the links:
Arduino Sketch: Luke_digital_I:O1
Arduino Sketch: Luke_Digital_I:O2
Arduino Sketch: Luke_Digital_I:O3