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Projects Interfacing w/ Software on the Computer
4

The MIDI library uses the Serial port to receive data. That means that you can't use it to debug your program. That leaves you with 4 choices:

  1. Get a different Arduino, like the Leonardo, where pins 0 and 1 belong to the Serial1 instance, not Seriail.

  2. Get an FTDI cable, and use SoftwareSerial on the RX and TX pins that you choose (NOT pins 0 and 1) to connect the FTDI cable to. Then, you can open a different COM port and use something like RealTerm or PuTTY to get the serial data from the FTDI cable.

  3. Get an LCD and print to it.

  4. Debug by guesswork.

Option 4 is the cheapest, but the least likely to be successful.