As microcontrollers become more powerful, they can process more at the edge. Machine learning-type applications using microcontrollers, particularly in the field of machine vision, are becoming more common. The relatively low cost of these microcontrollers makes it easy to fill up a workshop with many different models and brands.

In this section, we will look at a few of these microcontrollers before we build a QR code reader using the Maix K210 microcontroller.