To build this, you will need roughly $5.40 worth of components: Let’s see how to turn it into a USB MIDI adapter! Required hardware But there is even a better board for this: The ATmega32u4 board I previously showed how it can be made into USB HID mouse. However, since the Teensy still costs $12, and you have to get some additional components, it doesn’t make sense to use it in a dedicated MIDI adapter, since you can get a working USB MIDI adapter for around $15 from Thomann and probably many other places.īut how about other boards? After making my Teensy LC adapter, I actually tinkered with Adafruit Pro Trinket, and got that working as well (the standard Trinket does not have hardware UART so V-USB and software UART is somewhat risky). I used it to replace a non-working Chinese MIDI-USB adapter that did not send controller messages (i.e. Last year I wrote how you can turn Teensy LC into an inexpensive USB MIDI adapter. This article will detail how to build a USB MIDI adapter (one-directional: you connect the adapter with USB cable to your computer, and it receives notes and pedal data from your keyboard’s MIDI OUT and transmits them to your computer) with ATmega32u4, 6N137 optocoupler, a few resistors and spare MIDI connector or cable.
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