The dominance of Wireless Sensor Networks (WSNs) in the area of physical computing is expected and is unquestionable. As happened to all the emerging technologies after receiving the attention of a significant number of researchers, in order to ensure long term existence, the dissemination of their use must spread over a wider audience through simple and efficient educational projects. Towards this direction the current paper presents the development of a prototype, open source, multilevel, educational system based on WSN principles and oriented to “green” technology applications.