Maybe you heard about Micro:bit development board. This popular Micro:bit board is used for childern on primary school in UK. This board is popular on the whole world.
The ebook describes the using of Micro:bit and you find there a lot of examples how to use Micro:bit.

Cigdem Sengul and Anthony Kirby wrote the "Networking with the Micro:bit" in cooperation with Micro:bit Foundation and Nominet company.

The ebook ( PDF ) is available on http://nominet.blog/networking-with-the-microbit/