Proteus – a tool to design and configure the electronic devices, which are based on the various microcontroller of different families. The software allows to introduce the circuit in the graphic editor, model its operation and develop the printed circuit board, including three-dimensional visualization. Proteus provides the support of SPICE-models, which are often given by the manufacturers of electronic components. The software is also compatible with a huge number of digital and analog device models. Proteus allows to perform the testing for possible mistakes at the end of work over the board.