In sports, we usually observe sports activity over time. Also, time is one of the most important data for observing sports progress. The time for some kind of sports activity can be observed in various ways: stopping (measuring the time needed to perform the activity, e.g., a 100 m sprint), counting down (observing the activity in a certain time, e.g. the number of push-ups in 30 seconds). For some more time-complex sports, such as martial arts, in addition to the countdown, we also have the number of repetitions, so-called "rounds". This paper will show the creation of a sports scoreboard adapted for martial arts, which can count up to 79 rounds of 9 minutes and 79 seconds. The main goal of this final work is to achieve wireless communication between the remote control and the scoreboard to display time and rounds and their synchronization. In the paper, the production process itself was seen, starting with the selection of the microcontroller and the programming language, the selection of components and their connection into a functional unit, the display and creation of the program board in the KiCad program package. This way of making a sports scoreboard with a microcontroller of very high-quality specifications at an affordable price opens up many possibilities, such as connecting to a mobile device and replacing the remote control with a smartphone.