Ultra-low power MEMS activity sensor for wireless health monitoring system

Hironao Okada, Hirofumi Nogami, Takeshi Kobayashi, Takashi Masuda, Toshihiro Itoh

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This paper presents the design and implementation of a MEMS activity sensor operating at less than 50 nW for monitoring of the simple health conditions of animals, particularly of chickens. The developed MEMS activity sensor includes a piezoelectric microcantilever, a low power comparator integrated with a CMOS multi-step voltage reference generator, and a counter. This system enables the realization of a wireless sensor node to work continuously for more than two years using a 1.55 V button battery weighing 0.5 g.

Original languageEnglish
Pages (from-to)70-71
Number of pages2
JournalIEEJ Transactions on Sensors and Micromachines
Issue number3
Publication statusPublished - Mar 12 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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