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Wireless Sensor Networks (WSNs), usually battery-powered, thus very energy-constrained, present energy efficiency as the main challenge. To reduce the overall energy consumption of the network, research community has been tackling Power Management (PM) techniques on different levels - sensing, communication, computation and energy harvesting. Usually in WSNs the communication consumes most of the energy. But recently wireless sensor nodes are introduced that comprise also energy-consuming sensors, apart from the 'Traditional' ones like temperature, air pressure and humidity sensors. Therefore, besides the well explored PM techniques on the transceiver activity and wireless transmission, there is a necessity to introduce also the PM on the sensing unit that reduces the power consumption of the power-hungry sensors.
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