In view of indoor monitoring of the elderly in nursing homes

analyze on advantages and applications of sensor technology

and use the ZigBee technology to construct wireless sensor networks（ WSNs） to gain the information of the indoor localization of the elderly. Selecting some reliable sensor modules to collect the values of the bedroom environment

and combined with upper personal computer（ PC） compiled with G language

an elderly monitoring system based on sensing technology is designed. The coordinator in the system transmits the received signal strength indication（ RSSI） value acquired from the terminal device to the STM32 development board

and processed through an improved algorithm. The environmental parameter values collected and processed by the sensor modules are transmitted to the development board

too. The development board uploads the data to the upper PC through the Wi Fi module and router. Experiments show that the system can display part of the life information of the elderly on the upper PC

and the upper PC can control the lower PC to improve the indoor environment. This system plays a certain role in elderly nursing.