Also connected on the shield are three momentary push buttons (connected to D2-4), a reset button, and green and red stat LEDs. Potentiometers are connected to analog pins 1 and 2, and can be used to control volume, pitch, tone or anything else you'd like. The MIDI Shield can be mounted directly on top of an Arduino, connecting the MIDI-IN to the Arduino's hardware RX pin and the MIDI-OUT to TX. The MIDI Shield provides an opto-isolated MIDI-IN port as well as a MIDI-OUT port. The MIDI protocol shares many similarities with standard asynchronous serial interfaces, so you can use the UART pins of your Arduino to send and receive MIDI's event messages. The SparkFun MIDI Shield board gives your Arduino access to the antiquated, but still widely used and well supported MIDI communication protocol, so you can control synthesizers, sequencers, and other musical devices.
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