What is it?

MIDI UART interface-san is a handy interface PCB for MIDI and microcontrollers with commonly used basic circuit when you start developping MIDI-related MCU project, e.g. TRS jacks for MIDI I/O, optocouplers, digital buffers, etc. It means by using this PCB, you do not have to repeat soldering/making a breadboard for these purpose anymore.

You can choose both 5V and 3.3V for power supply with MIDI Manufacturers Association/AMEI compliant resistor specs(can be selected jumper pins), to match the power voltage of the MCU.

Kit contents

• Pre-assembled circuit board
• 3.5mm TRS Jack connectors (J1, J2)
• 1x3P Pin Headers(J3, J4)
• 1x4P Pin Socket(CN1)
• Jumper pins(yellow) 2pcs.
• MIDI DIN <-> TRS(3.5mm) conversion cable(A type) 2pcs.

How to assemble

Just solder J1, J2, J3, J4, and CN1.

How to use

• Select operation voltage by shorting Jumper pins on J3, J4. By shorting above two pins for 5V, bottom two pins for 3.3V.
• Connect V+ and GND to the circuit board, breadboard, or something you want to use with this product.
• Connect In-> to the MCU's MIDI Input.
• Connect Out-> to the MCU's MIDI Output.

Design Files

Github.com/kinoshita-lab