Abstract: For the life service of the aged in the community, to make their life more safe and guaranteed, we have designed an information interaction terminal and system based on the internet of things. The system uses Zigbee wireless communication technology to build a wireless sensor network, realizing the old man‘’s real-time monitoring and information collecting. We designed the information management center and the mobile node respectively. Management module is used for the community manager to unified manage each node, and the node module is added sensors to collect the old man‘’s real-time state. After testing, the system is stabilized, easy to operate, easy to management and extension, and suitable for the elderly services in the scope of community.

Key words: community service, Zigbee technology, a key alarm, internet of things, information interaction