Get input from USB musical keyboard to Arduino digital input

Projects Programming
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I have a musical keyboard (Casio CTK3500) which has an USB B to A output. I want to know a way to connect one (or more) of the wires from the USB cable to Arduino so that it can detect when a key is being played on the keyboard (maybe by detecting a voltage change, but I cannot seem to detect enough voltage change to do that).

I don't need to know which key is being played or anything like that. I just want to detect when a key is being played on the keyboard.

Any help is much appreciated.

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You need am Arduino with USB Host and then this library usb_midi_host - Arduino Reference

For the MIDI implementation of CTK3500 look at

I doubt that the keyboard is USB-OTG or USB-host. If it is you can just use a Leonardo and USB-MIDI library.

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