With greater availablity of technogy, all kinds of vehicles are becoming more and more instrumented and automated. For example, in order to ensure safety, it is necessary to supervise temperatures of some key points in vehicles, including the fuel tank, the engine and the speed changer, etc.
However, it is difficult to link so many points to the processor through electric wires, and the classical isolated sensors have some disadvantages: slow reaction rate, high measuring errors, complex installation and so on.
There is a possible solution to overcome these problems through the use of a wireless sensor network based intelligent temperature measurement system. Consisting of many sensor nodes and a control terminal, a WSN could detect and collect a variety of environmental or object information in the network coverage area, and process the information effectively.
This paper describes wireless sensor network (WSN) used for an intelligent temperature measurement system. In the system, temperature signals are acquired by digital multipoint thermometers, and transmitted to the advanced RISC microprocessor (ARM) by using Wireless Fidelity (Wi-Fi) technology. Then they are stored in SD card which is controlled by the microprocessor according to the IIS-bus standard format.
As the core module of the temperature measurement system, the Samsung S3C2440, is used. It is a 32-bit, 400MHz, low power consumption and high performance RISC microprocessor with ARM 9 as its kernel, which is particularly suitable for real-time control. Moreover, it supplies SD Wi-Fi device, so there is no need of collocating excess wireless equipment any more.
The embedded Linux operating system was selected to support the hardware. It is a mature open-source operating system, which can be encapsulated in the ARM 9, to accomplish complex algorithms and finish a variety of tasks. In addition, to supporting this specific application, the software system could be also tailored to adapt to changing requirements.
In the system, this Wi-Fi-based design has outstanding advantages, including broader coverage (10,000 and 90,000 square meters, indoor and outdoor, respectively ) and higher transmission rate (11Mbps). All the data wire interfaces (DATA0:3) of SD card can be used for serial data transmission, the highest of which reaches 100Mbps.
The system fully makes advantage of SD card’s characteristic of huge and long-time storage, remedying the defect of Nor Flash’s small storage in ARM. Long- distance control is accomplished the huge data stored in SD card can be transferred to the control center.
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