Life Microscope: Continuous daily-activity recording system with tiny wireless sensor
Takeshi Q. Tanaka, Shunzo Yamashita, Kiyoshi Aiki, Hiroyuki Kuriyama, Kazuo Yano · 2008
A continuous daily-activity recording system called “life microscope” 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: “cool sense” and “safe packet”. 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.