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In this paper, the node localization methods of ZigBee wireless sensor networks were studied. There are two key issues affecting the positioning accuracy: accuracy of RSSI value and optimization of localization algorithm. For the first issue, the effects of two kinds of environmental disturbance on RSSI values were analyzed, and then RSSI values were pretreated using Kalman filter. For the second,...
A flash disk read-write system for non-PC device was implemented using USB serial communications. In this system, a CH376S chip with USB master-slave interface communicates with single-chip microprocessor STC90C58AD thus enabling the single-chip microcomputer to perform read-write visits with flash disk. Experiments showed that this system could read from and write on USB as rapidly and conveniently...
This paper introduces a technology for connecting an embedded device to the Internet with single-chip microprocessor chip STC89C52RC as the core chip .The internal structure and characteristics principles of the network interface chip are described, and the corresponding design of hardware and software programming are discussed. This design system can achieve embedding of network protocol stack and...
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