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Wireless microsensors can sense and share data that can save lives, energy, and money. Recharging or replacing thousands of tiny, easily exhaustible batteries, however, is too costly. Fortunately, photovoltaic (PV) cells can generate 100x more power from sunlight than other transducers can from motion, heat, or radiation. But since PV cells cannot supply the milliwatts that microsystems can at times...
Because wireless microsystems can only incorporate tiny batteries, they typically exhaust stored on-board energy quickly. Fortunately, harvesting ambient energy is a viable means of extending their operational lifetimes, except starting and re-starting miniaturized microwatt harvesters from nocharge conditions is difficult. The challenge is drawing usable energy from millivolt signals under micro-scale...
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