Piezoelectric MEMS switch to activate event-driven wireless sensor nodes

Hirofumi Nogami, Takeshi Kobayashi, Hironao Okada, Gang Zhao, Takashi Masuda, Ryutaro Maeda, Toshihiro Itoh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have developed a wireless sensor node for monitoring the health conditions of animals, in particular chickens. Each wireless sensor node measures the body temperature and activity of a chicken. Because chickens are farmed for a maximum of two years, the required lifetime of a wireless sensor node without replacing the battery must be two years. To achieve ultra-low power consumption, the sensor node we use is an event-driven system activated by the movement of chickens. The activation conditions are determined by the threshold voltage of a comparator circuit, and the output voltage of a piezoelectric MEMS switch. Although the piezoelectric MEMS switch is an important element of our system, it poses challenges in generating enough output voltage from chicken movement (4∼15 Hz, below 0.5 m/s 2). In this paper, we measured the output voltage of the piezoelectric MEMS switch at low frequency, and with low acceleration vibrations. We used an experimental device with a piezoelectric MEMS switch to evaluate the relationship between the threshold voltage of the comparator circuit and acceleration, and determined when the comparator is switched during low-frequency vibrations.

Original languageEnglish
Title of host publicationDTIP 2012 - Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS
Pages248-252
Number of pages5
Publication statusPublished - 2012
Externally publishedYes
Event2012 Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS, DTIP 2012 - Cannes Cote d'Azur, France
Duration: Apr 25 2012Apr 27 2012

Other

Other2012 Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS, DTIP 2012
CountryFrance
CityCannes Cote d'Azur
Period4/25/124/27/12

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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