Abstract
This chapter presents a tool for monitoring WISPs that provides detailed information about the state of program execution, the messages being received and transmitted, and the availability of energy. Traces collected with our tool can be used for debugging, understanding WISP behavior, and tracking how energy is gathered and consumed. Our tool consists of a monitor board and ?rmware we developed and relies on minor instrumentation of the WISP software. The monitor board attaches directly to the WISP, but does not interfere with the powering of the WISP. Even with a monitor board attached, the WISP operates solely on harvested energy from the RF environment. The board can monitor the WISP’s demodulator, modulator, unregulated voltage, supervisor and demodulator enable lines, as well as parse any state information sent explicitly by having the WISP toggle debug pins. Information collected by the board can be sent over a serial connection to a PC for analysis. The monitor board can measure energy at a resolution of 0.14 nJ and the overhead on tracking WISP behavior is only 18 CPU cycles per sample.
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Notes
- 1.
This chapter is based on work first presented in Richa Prasad’s masters thesis [6].
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Prasad, R., Buettner, M., Greenstein, B., Wetherall, D. (2013). WISP Monitoring and Debugging. In: Smith, J. (eds) Wirelessly Powered Sensor Networks and Computational RFID. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6166-2_9
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DOI: https://doi.org/10.1007/978-1-4419-6166-2_9
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