Abstract
Nowadays, the actual post pandemic context of computer science teaching is having some special attributes: big number of students, low budgets, need for STEAM, need of what we can call “pre-robotics” abilities. Otherwise, the costs should be kept low. This paper is a workaround the need of buying expensive Arduino kits. Instead, it is focused on how to teach elementary computer science skills with less accessories added to an Arduino Uno board and is proposing a set of lessons based on this idea and the principle of learn-ing by discovery.