In a book a reader meets with basis of modern electronics - microcontrollers on the example of popular amateur platform of Arduino. Since simple charts managing luminescence of light-emitting diode, a reader gradually passes to more difficult devices: to domestic automation, clock and measuring devices, elements of construction of mechanical devices. Principles of programming are consistently expounded in the environment of Arduino with detailed by explanations.A book is continuation of book "Alphabet of electronics. Electronic devices with own hands", where it is possible to find necessary elementary physical information, and also properties of basic electronic components. A book is intended to the children of middle and senior school age and their parents, to the mugs on electronics, and also all those, who is interested in modern electronics.