This study aimed to determine the views of pre-service science teachers about STEM education. A two-hour Arduino based STEM learning activity was conducted for fifteen pre-service science teachers. Afterwards, the views of the participants were investigated by conducting an online survey consisting of open-ended questions. Finally, the obtained data were analysed with the content analysis technique using NVivo 12. As a result of the analysis, it was concluded that pre-service teachers do not know the content of the STEM approach but at the same time, they think that STEM education should be applied in schools, and they want to learn how STEM can be used in classes. Based on the results, it is suggested that it should be beneficial to provide professional development to pre-service teachers regarding the content of the STEM approach.