Simple AVR-based MIDI monophonic synthesizer.

MIDI, or Musical Instrument Digital Interface, is a specification for a communications protocol between digital synthesizers and other digital music devices. It was developed to be as simple and general as possible, to give synthesizer manufacturers as much flexibility as possible, yet still have their instruments talk to each other without communication problems. Here is a simple circuit for MIDI output that works well with Wiring or Arduino, the PIC microcontrollers, the BS-2, and the BASIC ATOM Pro24.

This is an inexpensive DIY MIDI controller device for USB. It consists of a simple AVR ATMega16 with driver software from Objective Development (see).

dsPIC-based voice MIDI synthesizer by Michael Herman

This MIDI Controller uses a PIC16F877A Micro and a 2 pin LCD Character Display.