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.