Using the development environment Keil uVision, a program was made that initializes timers, inputs and outputs of the development systems as well as sends one character data via a serial line. This program is downloaded using the ST-LINK/V2 to the development system STM32F4-Discovery. The development system is connected with wire to the USART bridge which is connected to the computer. This development system is connected to the terminal. By modifying initial program a new program is made that receives the voltage value of a potentiometer as digital value and sends the information to a computer. That program is also transferred to a development system using the ST-LINK/V2. In programming system MATLAB, a script is made that opens a serial connection, receives data transmitted through the USART bridge and displays them graphically. With the help of MATLAB GUIDE the analog-to-digital interface is made. Previously made script is implemented to the interface and several additional interface functions are made. Interface like that can receive data from the development system STM32F4-Discovery, process it and are graphically display it in real time.