The development of energy-efficient applications for wireless sensor networks requires mechanisms and tools for run-time monitoring of energy consumption. We propose a software framework that supports energy profiling of applications for the TinyOS 2.x platform. Measurements are obtained through the insertion of software probes within the code of the operating system. As a consequence, since the APIs are not changed, the programmer is not forced to modify the code of existing applications. The technique has been validated by comparing its results with the values registered by dedicated hardware.
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