Practical training and actual application of acquired knowledge and techniques are crucial for the learning of technical skills. We established a wireless sensor network system (WSNS) based on the 5E learning cycle in a practical learning environment to improve students' reflective abilities and to reduce difficulties for the learning of technical skills. Student learning was investigated using a Technical Expertise Assessment Form and Reflective Abilities Investigation Tool that we had developed. Results of the forms showed that the 5E learning cycle-based WSNS helped improve students' reflection and the ease in acquiring technical skills. Students' reflection was also shown to be significantly correlated with the learning of technical skills. We concluded that reflection provided by the sensory functions of the WSNS was able to reduce students' difficulties when learning technical skills.