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We present Epic, an open mote platform for application-driven design. Sensornet platforms, like most embedded systems, are tightly coupled to their applications. This coupling can make it difficult for general-purpose platforms to address application-specific needs, forcing platform designers to repeatedly reimplement functionality. Inspired by the hierarchical nature of software and integrated circuit design, we propose sensornet platforms be composed hierarchically from a family of modular components. This approach makes platform development accessible to a much wider community; developers do not need to be analog, sensor, or radio frequency experts, and can instead reuse components that encapsulate the needed functionality.