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We have been developing a novel receiver and communication protocol which can improve the communication efficiency with wireless sensor nodes by minimizing the packet length. Generally, several tens of bits, which is called “preamble”, are needed for synchronizing the timing between the bit rate of a transmitter and receiver. In sensor network systems the amount of transmission data is relatively...
This paper describes the development of a custom LSI which works at less than 0.5 µW for wireless sensor nodes used in health monitoring systems. To monitor body temperature and activity of animal or human with low power consumption at any time, ultra-low power signal processing are essential as well as low power sensors. We have deve loped measurement methods with bimetal type and piezoelectric type...
The present study describes the MEMS-based piezoelectric switch to activate the event-driven wireless sensor node for chicken health monitoring system. We have fabricated the switch composed of “S” shaped piezoelectric cantilever and proof mass, where the resonance is 24 Hz. When the switch has been vibrated at 4, 6, 8, and 12 Hz, which is close to the chicken movement frequency, the input vibration...
This paper describes the development of a miniaturized 300-MHz band antenna that is effective for small wireless sensor nodes for human and animal health monitoring. We have proposed a new concept of antenna miniaturization using magnetic materials and optimized the design of the new antenna taking the advantage of 3 dimensional full-wave electromagnetic field simulations. Also, its fabrication process...
We have developed a novel piezoelectric accelerometer with digital output for ultra-low power wireless sensor nodes. The accelerometer is composed of an array of piezoelectric parallel-plate capacitor structures that are joined together in series and connected to a CMOS switch array. This composition makes it possible to realize a digital output accelerometer in which the number of on-state CMOS switches...
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