Wireless sensors networks (WSN) use can be very interesting in agricultural and environmental data collection. The first WSN generations operated in a continuous data stream mode which generates high energy consumption. This article presents a new WSN platform that limits data exchanges and has an increased lifetime. All of its components are designed in a resource aware mode in relation with energy, memory and processing. This platform is built on wireless sensors, implementing a hardware component-based concept, that allow them to be combined to form a more evolved wireless device. To manage this wireless sensor, a hybrid operating system, both multithreading and based on events, has been developed and is associated to a micro-file system. A WSN management tool is in charge of monitoring the wireless sensors and of the data collection. A first evaluation of this WSN platform has been realised in an agricultural context data collection.