General
We aimed to design an accelerometer device which was capable of collecting raw tri-axial acceleration data in high time resolution (>30Hz) over 7 days on a single charge, to be worn by human volunteers during daily life conditions. The device could be worn at any body location but we worked specifically towards a wrist-mounted position. The device would be worn at all times, including when person was showering or swimming, so should be 100% water-proof.
The materials include hardware design files for electronics and casing, as well as firmware and software source code. The hardware design is released under MIT license, and software/firmware under the GNU 3-clause BSD license.
Development information
The design criteria used for the design:
- be able to collect three-axis accelerometer data of up to +/- 6g for at least 7 days at a sampling rate of at least 40Hz or more and a resolution of 12 bits.
- be small enough to be posted and attached unobtrusively to the human body, typically on the wrist.
- be able to ‘sleep’ for several days before starting data collection.
- be economical to manufacture in thousand-of quantities.
- store data in such a way as to make it straightforward to extract by research staff.
- store sufficient metadata to allow calibration factors to be checked and clock drift to be compensated for.
For specific areas click on the following links:
Design
Implementation
Toolchain
Build
Flashing the BioBand
Debug
Information Sources
PC software
Hardware
For source code see the subversion repository, for all other documents ..
