Modern micro-controllers are absolute marvels, but it isn’t too many projects use one and nothing else. For an example of such simplicity, take a look at [oyama]’s Pi Pico MIDI looper.

Mrinalini Krishna is the Senior Editor of investing news at Investopedia. She's been a journalist for more than 10 years covering business, personal finance, and investing news. In 2016, just five ...