This paper presents the first version of a Wireless Sensor Network simulator, called CupCarbon. It is a multi-agent and discrete event Wireless Sensor Network (WSN) simula-tor. Networks can be designed and prototyped in an er-gonomic user-friendly interface using the OpenStreetMap (OSM) framework by deploying sensors directly on the map. It can be used to study the behaviour of a network and its costs. The main objectives of CupCarbon are both educa-tional and scientific. It can help trainers to explain the basic concepts and how sensor networks work and it can help sci-entists to test their wireless topologies, protocols, etc. The current version can be used only to study the power diagram of each sensor and the overall network. The power diagrams can be calculated and displayed as a function of the simu-lated time. Prototyping networks is more realistic compared to existing simulators.