The design on the wireless wrist device of vital movement index for solitary elders

The paper introduced the solitary elders´ monitoring system by using the wireless communication chip - nRF9E5 of embedded microprocessor, in order to facilitate and help elders to get first aid during sudden disease or disaster, and to improve old-age service system and their quality of life. This paper mainly illustrated the design principle of the wrist device for solitary elders, showed the circuit design in detail, meanwhile it conducted a detailed description on the working principle of the wrist device and the realization of low-power program. Proven, the wrist device with easy to carry, the use of flexible, low cost, easy expansion of functions, is applicable to many areas.