The complete Arduino Piano Project can be built on top of a breadboard with some connecting wires. The circuit diagram made using fritzing that shows the breadboard view of the project is shown below ...

which is why we decided to build a Wireless Bluetooth Controlled Robot Car Using Arduino. Detailed circuit diagrams and code explanations aid technical understanding, with an Android app enabling ...

The orange, tomato, and two apples seen above act as keys for the virtual piano. The concept ... it is connected the I/O pin of the Arduino. You can see the schematic as well as a demo clip ...