| 摘要 |
A micro handheld alarm network system for alerting to any lose of a network entity is presented herein. The micro handheld alarm network system contains several system elements first type which communicate between them by means of wireless communication first type protocols such as a Zigbee (IEEE 802.15.4 standard). The Zigbee standard includes a method of determining the distance between every two system elements within the micro handheld network. The micro handheld alarm network system can also include at least one system elements second type, which can, in addition, communicate by means of wireless communication second type protocols, such as Bluetooth and Wifi. By monitoring such distances, the system elements may decide if one or more of the system elements are drawn away from the other system elements, thereby alerting the user of such occurrence.
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