This board is designed for motion capture. It especially targets human motion.
For accurate motion reconstruction accelerometer is not sufficient on its own. For example, a rotation along an axis that does not cross the accelerometer center can generate a huge acceleration (Coriolis acceleration). To compensate this artifact, one must use a sensor that gives a hint on the rotation. On the motion board we propose on this website, we added two kind of sensors: gyrometer and magnetometer. The accelerometer we used is a LIS3LV02DQ from ST Microelectronics. Its a 3-axis 12-bits-resolution accelerometer (+/-6g) that is interfaced using I2C or SPI buses. For rotation estimation we added two gyrometers, a single-axis gyrometer and a dual-axis one (because 3-axis gyrometers do not exists at the time we speak). The single-axis one is a LY530AL from ST Microelectronics (Z axis, 10-bits resolution, I2C, SPI and analog outputs, +/-300°/s). The dual-axis X-Y gyrometer is a IDG500 from Invensense (analog output, +/-500°/s). For more accurate orientation estimation we added a I2C 3-axis magnetometer from Honeywell (HMC5843) that gives 12-bits measures of the magnetic field (earth magnetic field for angular reference).
As the four sensors we used on this board have different kind of interface, we chose to connect them that way:
The daughter board pinout is: