Not sure where to start this thread so I figured Bar Sport would be safe.

I am looking into creating a educational display for teaching kids about capacitance. I was think about creating a display to measure the capacitance of the human body.

I found something similar here:

http://web.mit.edu/Edgerton/www/Capacitance.html

from the explanation they first charge the person with 600V then discharge it into a .06 mF capacitor. Then the voltage across this capacitor in milivolts is the body’s capacitance in pico farads.

How accurate is the Arduino at measuring voltage? Will it be able to pick up a few mili-volts of difference. It will not be interesting if it reads the same value every time.

Any safety issues with shocking kids?

Any thoughts would be greatly appreciated.