A blog of my personal projects, including Raspberry Pi, Arduino, and anything else which catches my eye
If you’ve been following my MIDI keyboard series, in part 4 you’ll have seen my dangerous looking MIDI connection. While I have a plan to improve on this later, I wanted to have a more robust connection during development. Because I already need a USB connection to the Arduino to upload software updates, I wondered if I could use this to transfer MIDI data as well.
Continue reading “Arduino USB Midi – the easy way”In this post, we take a simple look at what I/O is, and why it exists in all systems. Then we look at the method of multiplexing which allows us to connect to it more efficiently, making the most of the pins available on a microcontroller. Continue reading “Multiplexing I/O – Why and How?”
MIDI stands for Musical Instrument Digital Interface.
It is a communication protocol which allows electronic musical instruments to communicate with each other, to synchronise timing, for example. It also allows the interface which the musician uses to be separated from the instrument, which makes the sound. This means that a musician can use a single keyboard to play many different electronic instruments.
I use archlinuxarm on pisaac’s SD card, because it’s the most basic system I could find.
I don’t need any fancy GUIs, and I also prefer “The Arch Way” generally to any other Linux distro paradigm.
I discovered an issue recently where my SD card (only 2GB) was getting very full, and tracked it down to systemd’s journal using almost 0.5GB.
Continue reading “On arch, systemd journal eats SD card space”
