Every machine has its own way of communicating with its operator. Some send status emails, some illuminate, but most of them vibrate and make noise. If it hums happily, that’s usually a good sign, but ...

These days, streaming services are a great way to listen to music or podcasts on your computer or on the go. However, they lack one feature of the MP3 players and streamers of old: visualizations!

Arduino Nano firmware that turns an nRF24L01(+/+PA+LNA) module into a 2.4 GHz spectrum scanner and streams the data over USB serial as plain CSV. A host program (your visualizer) reads /dev/ttyUSB0 ...