arduino keyboard input
The same interface nowadays seems like everything uses USB. It would be nice to use some of these devices with my electronics projects. The chip on my Arduino board could be used to output USB data. It can act as a USB device, but to receive USB data. It needs to act as a USB host, which is a bit more complex. Thankfully, someone went along and built a shield attachment for Arduino that incorporates a chip capable of handling USB host duties. Oleg from circuits at home produced the USB host shield and provided some examples on his site for using it with mice keyboard game controllers. I wanted to use it with a USB midi keyboard. Unfortunately, there are no examples for that. So I’ll need to do a bit of hacking. Learning about the USB data protocol can be a little confusing, even after reading or at least thoroughly skimming the over 600 page official spec. In a nutshell, data is transferred between the host and the device through a sort of virtual port called an endpoint. Most devices use multiple endpoints of different types, each one identified by a number and the direction that data flows through it. The host manages all of these endpoints along with a bunch of other details. After a little experimenting, I figured out that USB MIDI devices send out data in a similar way to the PlayStation controller used in one of the USB host shields example sketches. So I was able to repurpose a lot of that code to work with my keyboard to get a better idea of what it was sending out.
I program the Arduino to repeat incoming values. Back to my computer, the output was more or less regular mini messages. Something I’m familiar with the first byte tells me. This is a note on message. The second byte tells me, which note was pressed and the third one is the notes velocity. Now I can send these values out over a serial port and it’ll be compatible with any standard mini device such as my little MIDI Foxen, which is also based around Arduino Music. So I’ve essentially built my own USB MIDI to old school MIDI converter, which is cool.
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There are a lot of potential projects you could tackle that would be benefit from an Arduino keyboard input. Unfortunately, … https://t.co/CPjy8tYGsu
Originally posted 2017-02-05 05:22:46.