Micro: bit is a small microcontroller learning system, developed by the BBC in collaboration with the University of Lancaster for seventh grade students in Great Britain. The hardware and software tools are very well suited for work in school. Students can program interesting applications around a 32-bit ARM controller with very little effort, and without the need to worry about details of the hardware involved. As you can see on the Micro: bit web pages, they are very detailed and well used.But the Micro: bit can do more! It is a complete development system and in addition a versatile single-board computer for all kinds of tasks. This controller can also be used as a measuring instrument in the electronics lab. It is therefore exciting to examine the different properties of the system more closely.The aim of this book is to explore some of the many possibilities of the Micro: bit. The result of our little expedition into hard and software is something like a complete overview on the topics of microcontrollers, programming, electronics and measurement technology. Many of the aspects also apply to other microcontroller systems or to electronics in general.I hope you enjoy the experimenting and programming, leading to success with your own projects later!Some additional material and updates can be found at www.elektronik-labor.de .(now, mostly in Ger