Simple piano on ATmega16 using 7 buttons (PINB Atmega16) and speaker (PINA2 - GND ATmega16). It can be PC speaker. Datasheet of Atmega16 you can find in another project or on official page.

Do  - 261.6 Hz
Re  - 293.7 Hz
Mi  - 329.6 Hz
Fa  - 349.2 Hz
Sol - 392.0 Hz
La  - 440.0 Hz
Ti  - 493.9 Hz  

Simple electronic musical instrument on MCU is a funny stuff. What can you make? It's your own imagination. I'll give you one example: you can make cool key trinket and play imperial march from Star Wars movie for your friends.

0. You can use another MCUs. All you need is datasheet. Don't forget change pins!
1. Make project in AVR Studio choosing 8-bit MCU ATmega16.
2. Copy code from piano.c into your main.c file.
3. Build project.

Free