I am interfacing between arduino and MIDI devices. Newer MIDI devices are likely to have 3.3 volts on the receive/transmit lines, whilst older devices 5 volts. What happens if you connect a 5v device to a 3.3 volt device?

MIDI 5v and 3.3 volt

JohnLincoln April 21, 2018, 9:23am 5

From the MIDI V1.1 Electrical Specification:

MIDI OUT Circuit: