Title :
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
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;
Conference_Titel :
Networked Sensing Systems, 2008. INSS 2008. 5th International Conference on
Conference_Location :
Kanazawa
Print_ISBN :
978-4-907764-31-9
DOI :
10.1109/INSS.2008.4610918
