MIDI synthesizer Using Atmega32


MIDI Synthesizer

Our Final Project for ECE 476 was building a MIDI synthesizer using a MEGA 32 microcontroller.  At first we wanted to tear apart an old keyboard and use the MCU to decode directly from the sensors which detected key presses.  We then learned about the MIDI protocol and decided to use the MCU to decode MIDI packets sent by they keyboard and then play the appropriate note.
Once we determined which note the keyboard is trying to play, we are then able to synthesize the correct 8-bit sine wave.  We then wanted to be able to send the output of our signal to speakers so we could hear the results.

This project was a great learning experience about how music is replicated digitally and also taught us a great deal about signal sampling and generation.


Project Idea
Our first idea for this project was to take an old keyboard and rewire it to use the microcontroller to generate sound to our own set of speakers.  Our TA then suggested we decode the output of a MIDI keyboard and produce an appropriate sound.  Our project is specifically designed for the Studio 610 plus keyboard by FATAR.  This was the only MIDI device we had access to so we could not make our MIDI decoding scheme any more general.  Our synthesizer is not guaranteed to work unless it is hooked up to this specific keyboard.

MIDI synthesizer Using Atmega32
MIDI synthesizer Using Atmega32

Project Structure
The overall setup of our project goes like this:
Keyboard Press —-> MiDI output —-> optoisolator —-> UART —-> code to pick correct note —-> DAC —-> low-pass filter —-> TV-speaker.
For more detail: MIDI synthesizer

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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