What if you could turn any conductive surface into an instrument? Like, say...a mug of water? Best of all, it's cheap; you'll only need $1 worth of extra electrical components (not including the Arduino).
For this project, my friend Harvest and I combined Disney's Touché touch-sensing system with Arduino, and then used ChucK to generate music based on the input. Rain falls gently in the background, and when the user approaches, they can trigger notes on a whole-note scale by touching the mug. Touching the water directly results in some lovely raindrop-inspired, high-pitched notes. Finally, touching the water while also touching a grounded surface will trigger a thunderclap!
Some thank-you's are in order:
You will find this Instructable much easier to follow if you have a basic understanding of circuits. Additionally, if you want to edit the musical behavior, you'll have to use the ChucK language.
Common problems, things to watch out for, etc:
Make sure your laptop is properly grounded when you do this (e.g. plug it into a wall). Otherwise you'll get some weird readings. Additionally, you may have to alter some of the values in the springshowers.ck file in order for this to work for your personal setup. We used a plain ceramic mug.
A .zip download of all code is available at the next step, but here's the github repo if you want to download the code from there as well.
Check out my blog at bonnie-eisenman.tumblr.com to see what I'm up to.
You will need one each of the following:
Resistors: 10k, 1M, 3,3k
Capacitors: 100pf, 10nf
Coil / inductor: 10mH
We purchased these from Mouser. This sample shopping cart contains enough materials for 3 such projects. It comes out to about $1.11 per project for all of these components, not including shipping!
Additionally, you will need an Arduino, breadboard, jumper wires, and an alligator clip -- all of which should be pretty standard.
See attached image for the circuit image, taken from this Instructable, which includes instructions on how to setup the circuit.
You'll want to set up the circuit on a breadboard, and connect an alligator clip to the end where the "object" should be. We then dunked the free end of the alligator clip into a mug filled with water, and plugged the Arduino into our USB port.