MIDI to USB Cable: The Ultimate Custom Guide The MIDI-USB cable is the fastest and most direct way to get a MIDI instrument (such as a keyboard or piano) to use with your computer. However, the MIDI-USB adapter market is crawling using low-cost, mediocre interfaces that may display garbled and distorted information in a few days or weeks, eventually leading to failure. MIDI DIN Electrical Specification The original circuit diagram is shown below for reference (it is the most common circuit in use today, and is still acceptable). For more details, please see The Complete MIDI 1.0 Detailed Specification. Figure 1: Original Electrical Specification Diagram (Note: This diagram is superceded by MIDI 1.0 Electrical Specification Update ) Midi-to-usb Adapter Cable Schematic - WordPress PDF fileMidi-to-usb Adapter Cable Schematic PC-MIDI interface adapter (MIDI cable) schematic 'AMK-03' cable Pico Projector uses a non standard Mini USB connector, when using a standard USB lead. Use MIDI to control practically anything. The MIDIWidget accepts MIDI input via 5-pin MIDI connector or via USB and generates 5V logic output. Buy now. Cheap USB MIDI cable: some self assembly may be required This USB MIDI cable might be a cheap and quick way to add USB enabled MIDI for Arduino, but I’m really wondering if it would have worked with any MIDI device at all due to incorrect wiring. You get what you pay for: some self assembly may be required.