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6N138 Optocouplers: Features, Pinout, and Datasheet
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Midi library, for communication with musical instruments
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Nano not receiving midi messages
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Reface MIDI pin-out | Sand, software and sound
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Notes and Volts: Fun with Arduino - Midi Input Basics
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MIDI Hardware – Part 1 – Infinite Wave Project Blog
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6N138
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6N138 Optocouplers: Features, Pinout, and Datasheet
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serial - MIDI IN : many circuits - Electrical Engineering Stack Exchange
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Notes and Volts: Fun with Arduino - Midi Input Basics
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6N138-COMP-IC-6N138