The thesis addresses design and development of a computer module for controlling the measuring instrument for testing laboratory solar cells uMPPT. We will describe the importance of testing the solar cells in wide variety of environmental conditions and its impact on solar cells aging. We will introduce the current system of multichannel maximum power point trackers and a reason for supplementing it with its own computer module. Computer module is constructed on a four-layer printed circuit board with dimensions of 10 x 10 cm and is designed to work with Raspberry Pi Compute Module. Because of the high-speed circuitry, we need differential transmission lines that have controlled impedance. Module consists of several connectors that are necessary for connecting a personal computer and the measuring system. A dedicated microcontroller with associated firmware was used for the RS-485 communication interface between measuring unit and the computer module. Result of the thesis is a computer module and application with graphical user interface, which is the base for the future software development.