This paper presents an approach for K-12 Engineering education aimed to facilitate the concept learning in preschool andelementary school using simple robotic prototypes developed with active participation of children. The approach focuseson strategies for imparting engineering knowledge dealing some concepts related to subjects such as physics, electricity,electronics, mechanics and other fields related to engineering education by means of an open and affordable technology.The designed approach considers four stages to motivate the learning: sensitization, robot design, robot construction andevaluation. The paper also presents results about the impact assessment of the proposed K-12 approach throughqualitative data gathering to know the children’s impressions and a survey intended to know the opinion of the children’sparents and schoolteachers about robots as a didactic resource.