Getting started with breadboards was really exciting. I want to make hardware for musical applications eventually, so I decided to make a piano light switch.
The first thing I did was set up the connections on my breadboard. I used five lights, each using a 220 ohm resistor. I arranged everything in parallel so that I could close circuits separately.
To create the piano I wrapped a piece of aluminum around the side of a piece of cardboard. I connected that strip of aluminum to the breadboard’s ground. Then I separately connected each LED’s ground to the piece of cardboard, with an opening. This allowed me to use another piece of aluminum wrapped around my finger to close each circuit, when pressed.
Will Politan ITP Blog 