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Power Management for Energy Harvesting Wireless Sensors
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The objective of this work was to demonstrate smart wireless sensing nodes capable
of operation at extremely low power levels. These systems were designed to be compatible
with energy harvesting systems using piezoelectric materials and/or solar cells.
The wireless sensing nodes included a microprocessor, on-board memory, sensing means
(1000 ohm foil strain gauge), sensor signal conditioning, 2.4 GHz IEEE 802.15.4
radio transceiver, and rechargeable battery. Extremely low power consumption sleep
currents combined with periodic, timed wake-up was used to minimize the average
power consumption. Furthermore, we deployed pulsed sensor excitation and microprocessor
power control of the signal conditioning elements to minimize the sensors’ average
contribution to power draw. By sleeping in between samples, we were able to demonstrate
extremely low average power consumption.
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