The increasing importance of introducing computer science and computational thinking in primary education highlights the need to prepare teachers adequately. This study reports on professional teacher training in programming. It draws on the Technology Usage Inventory (TUI) model to investigate how an interdisciplinary intervention with programmable robots, combined with the storytelling method, can influence the intention to use them in the classroom. Special focus is given to the Tell, Draw & Code method to offer teachers a didactic concept for implementation. The floor robots used in this study are Bee-bots. At the beginning and end of the teacher training course, the participating teachers completed a questionnaire about their perceptions, attitudes, and intentions about using robots in the classroom. In addition, after designing and implementing activities with robots, the teachers provided qualitative reflections on their experiences. In comparing pre-and post-test and the analyses of the qualitative data, the study shows a significant increase in the positive attitude towards using the robots. These findings highlight the need for teachers to have opportunities to explore, reflect on and experience the potential of new technologies as part of their teacher development to implement innovations sustainably.