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Sammy1Am / MoppyClassic

Moppy has been replaced with Moppy 2.0!
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Hard disk drives and Moppy #160

Closed Goicannafr closed 7 years ago

Goicannafr commented 7 years ago

Hello! I'm wondering if it's necessary to modify the code on Moppy to play MIDI on HDD. From what I understand, it's important to amplify the signal with transistors, but I can't figure out how to do it. Any advice or help will be appreciated. Thanks!

Sammy1Am commented 7 years ago

Sorry for the long gap in replying. The signal that gets output from the "Step" pins (even numbered pins) will essentially be a square wave at the correct frequency for the MIDI note, so you shouldn't need to modify the Arduino code at all.

I don't know for sure the specifics of connecting that signal to the HDD, but it does seem likely that you'd need to use a transistor to really get much sound out of it. You could try it directly from the Arduino, but I guess there's a chance you could damage the Arduino if it tries to draw too much current.