Life Microscope: Continuous daily-activity recording system with tiny wireless sensor

Author

Tanaka, Takeshi ; Yamashita, Shunzo ; Aiki, Kiyoshi ; Kuriyama, Hiroyuki ; Yano, Kazuo

Author_Institution

Central Res. Lab., Hitachi, Ltd., Tokyo

fYear

2008

fDate

17-19 June 2008

Firstpage

162

Lastpage

165

Abstract

A continuous daily-activity recording system called ldquolife microscoperdquo is developed. Acceleration waveform data is acquired without any data loss for a week with a 150-mAh battery. This is made possible by two novel techniques: ldquocool senserdquo and ldquosafe packetrdquo. Cool sense reduces power by 98% during continuous sensing at frequencies such as 20 Hz by using a millisecond time-scale sleep. Safe packet ensures lossless data acquisition with low-cost storage and efficient data compression in wireless environments with interference. In our experiment using the life microscope system, we recorded lossless activity data of 20 participants for more than 4 months.

Keywords

data acquisition; wireless sensor networks; acceleration waveform data; continuous daily-activity recording system; cool-sense technique; data compression; life microscope; lossless data acquisition; low-cost storage; millisecond time-scale sleep; safe-packet technique; tiny wireless sensor; wireless environments; Acceleration; Batteries; Data acquisition; Data compression; Frequency; Interference; Microscopy; Sensor systems; Sleep; Wireless sensor networks; Accelerometer; Human activity; Low-power sensing; Storage; Wireless sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Networked Sensing Systems, 2008. INSS 2008. 5th International Conference on

Conference_Location

Kanazawa

Print_ISBN

978-4-907764-31-9

Type

conf

DOI

10.1109/INSS.2008.4610918

Filename

4610918