| Summary: | 碩士 === 國立交通大學 === 電控工程研究所 === 101 === A wireless intelligent surveillance platform which materializes wireless sensor network technique via the IEEE 802.15.4 communication protocol has been investigated in this study. The core chip of designed system is named for CC2530 controller which has embedded Transceiver and is produced by Texas Instruments. In order to achieve self-scheduling of TDMA mechanism, the segmentation basal of TDMA time will be based on built-in timer, and amend the CSMA mechanism in the protocol. While the number of variance of sampling data is small, by using SD card, data could be saved directly and only fractions of them are desired to be uploaded by sensor nodes, which improves the rapid depletion of batteries because of redundant data processing and wireless transmission in traditional sensor nodes, and then prolong life cycle of the proposed system. Moreover, in order to reach optimum sampling time on wireless sensor network as well as reduce distortion when signal recover; therefore, this study proposed self-defined synchronization frame and regular broadcast not only provide time base of the sensor nodes within the network, also allows data access to upload or saving in external SD card in planning time slot, respectively. In the end, according to the experimental results the synchronization mechanism along with the timeslot scheduling mechanism could not only effectively synchronize network nodes but avoid collision of data transmission; moreover, being able to restore sensing data in the whole network by taking advantages of dual-mode switching method and proper data access is verified as well.
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