Application of a one-wire digital temperature sensor in the monitoring system of a granary's temperature
ieee international conference on photonics(2009)
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.
MoreTranslated text
Key words
fault tolerant,interfaces,data storage,logic,integrated circuits,networks,transmission line,computer hardware,sensors
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