The theme of this graduate thesis is the use of educational robots in educational system. The idea for the topic of this graduate thesis emerged due to the changes that took place in the Croatian education system. The first chapter is an introduction to the thesis and it is in general about the use of technology and changes in the Croatian educational system. The second chapter presents the proposal of the National Curriculum Framework, its new perspective, goal and structure of the syllabus. The third chapter deals with the curriculum proposal for the subject Informatics. The most important change in the curriculum of subject Informatics is the division of the teaching material by domains. The fourth chapter in the thesis discusses robots in general, robotic revolutions, usage of robots in schools, teaching of programming and programming languages for children. The fifth chapter describes the STEM, and the meaning of STEM and STEM development in Croatia. The importance of STEM is reflected in the introduction of STEM into primary education to build workforce in this area for the future. The emphasis in this paper is on mBot robots and microprocessor micro:bit. Chapter six describes mBot, mBot’s origin, consisting parts of mBot, how it works, and some examples of mBot’s use are shown. Mathematics lesson with mBot are shown in the next chapter. Chapter seven describes the micro:bit, micro:bit’s consisting parts and how it can be applied in teaching. In the eighth chapter is example for Informatics lesson with micro:bits. At the end of the thesis there is a conclusion that contains a personal comment of the author on the topic.