To analyze the motion of infants to detect tremors or other often subtle patterns of motion in small children a system of Bluetooth wireless accelerometers was developed.  These 3-axis accelerometers weigh under 10g and can run up to 4-5 hours while sampling at about 50 Hz and have an option to log to microSD card.  The next version under development is being optimized to increase the run time and sampling rate and improve the synchronization between sensors.

wireless_accelerometer