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Proceedings Paper

Application of a one-wire digital temperature sensor in the monitoring system of a granary's temperature
Author(s): Hongtao Ma; Xiaojun Wang; Xiuqing Zhang
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Paper Abstract

A temperature monitoring system with characteristics of bus topology structure is made up of computer, interface adapter, bus driver, bus converter, transmission line and especially 1-wire digital temperature sensor DS18B20. Category 5 twisted-pair is used to form a tree-like or star-like network, in which more than 500 digital temperature sensors can be connected. Bus drivers and converters in network are composed of low-cost 74HC series logic ICs which has a very low static power consumption and high performance, so they can be powered through the sensor bus and make installation, maintenance, and expansion of system very convenient. Because of hardware fault-tolerant technology used by bus driver and converter circuits, the fault sensor branch or branch bus can automatically detach from the main bus and will not affect normal working of other sensors in network, so to solve the problem of a certain sensor or branch's damage causing the paralysis of entire bus. The length of sensor bus can extend to more than 1000 meters. It is very suitable for the multi-point temperature monitoring sites where the detected points are relative concentrated such as food storage, vegetables greenhouses and so on.

Paper Details

Date Published: 11 July 2009
PDF: 4 pages
Proc. SPIE 7490, PIAGENG 2009: Intelligent Information, Control, and Communication Technology for Agricultural Engineering, 74902Q (11 July 2009); doi: 10.1117/12.836728
Show Author Affiliations
Hongtao Ma, Hebei Univ. of Science and Technology (China)
Xiaojun Wang, Hebei Univ. of Science and Technology (China)
Xiuqing Zhang, Hebei Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7490:
PIAGENG 2009: Intelligent Information, Control, and Communication Technology for Agricultural Engineering
Honghua Tan; Qi Luo, Editor(s)

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