Netduino Plus 2 --- Midi Player





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Published on Feb 5, 2013

I've created a Midi Player for my Netduino Plus 2.

This is written in C#. You can find all of the code on CodePlex. ( see LINK below ).
In this version, all of the files are stored on the SD card. Midi files have a .mid extension. These should be converted to type 0, which is all the tracks in ONE-track. NOT multi-tracked. Other than that, this program parses standard midi files and then plays them back on a standard Netduino Plus 2.
I am using all 6 of the built in PWM channels.
Each channel outputs one note at a time, so you get up to 6-note Polyphony.
A song that is really busy, with LOTs of channels may not work well.

In this version, I added on a shield with a 6 channel audio mixer, utilizing an OP-AMP. It is a fairly basic circuit, schematic can be found on my CodePlex page.
( http://netduinop2midiplayer.codeplex.... )

The 1/8" jack can go to a line-level input or headphones work well, too.
A raw speaker does work, but would be better driven by an amplifier (IC or otherwise).

This may seem kinda silly, considering you can buy a MIDI shield add-on...
but... well... that wouldn't be any fun to code !!! :-)

I also have an older version on my video channel here that simply uses resistors to mix the PWM outputs. This is fairly CRUDE, but tested my coding.

ENJOY !!!!



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