The above video is demonstrating a 4.5″ flex sensor made by Spectra Symbol that I got from Sparkfun. Hooked it up to an Arduino and had it print the values to the serial monitor. Since I don’t have a tripod, it was going to be difficult to demo with only one hand, so I ended up taping the sensor to my finger. Ghetto? Yes. But it actually was pretty fun, and gets me psyched up to buy a glove to mount this on. So far it seems to work good enough for my needs.