Nextion MIDI I/O interface

Had a small moment of panic when wiring it up, but the TTL serial pins are clearly labeled and it worked on the first try with my Arduino. The opto-isolation gives me real peace of mind when hooking it to a bench supply, and it's been rock-solid at 31250 baud for a week now.

Took a chance on this for a Teensy project, and the opto-isolation is a lifesaver—no more ground loops scrambling my MIDI data. The 31250 baud TTL hookup was rock solid right out of the box.

Wired this up to my Arduino for a quick test and the 31250 baud sync was flawless right out of the box. The opto-isolation gives me peace of mind when powering things separately, and it’s tiny enough to tuck into any project.