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A completely energy autarkic design for a classroom response system is presented. Maloperation by the user is prevented with the chosen design (no unnecessary buttons and switches). Electronic classroom response systems have been around for quite a while and do exist in various forms and flavors. Most commercially available solutions, however, have several disadvantages. The new device is an easy-to-use, robust form of a clicker, which takes its energy from the click itself, due to a very low-power system using only an energy of around 15 μ J per wireless telegram transmitted from each student to the teacher’s computer. The described system serves as both, a method to check students’ progress in any field of lecturing as well as a tool that (by its development) instructs students in the field of “Energy Harvesting for Small Wireless Devices”. The system also contributes to raising awareness of the material and energy balance in today’s electronics.

Battery-Free Classroom Response System Using Piezo-Electric Buttons