Research And Design On The Ultra-low Power Consumption Wireless Data Gathering System

The data transmitting by radio frequency is more and more broadly used with the development of the wireless communication technology. Especially in the field of the data gathering which can't bc transmitted with the line previously can be transmitted the by the radio now. In this way, while we expanding the range of the data gathering system, the data transmitting will also be more convenient and prompt.In this paper, based on the research of the development of the science and technology in recent years including the wireless communication technology, wireless sensor network and the radio frequency identification, by fusing the modem ultra-low consumption microcontroller technology, we research the ultra-low consumption wireless data gathering system in the distribute environment, and present the blue print of the system and the terminal hardware design model.In our system design, the communication model in our system is an unsymmetrical principal-subordinate model. A central controller is projected for receiving, managing and displaying the data gathered by the terminals in the distributing environment.The central controller is composed by a PC and a data receiver. The receiver is similar to the terminal since the coding and decoding, modulation and demodulation must be symmetrical. So we use the same microcontroller and other apparatus. By passing the interface of RS232 the data is transmitted to FC, which is managed and dealt with the manage software in FC.In the design of data gathering terminal, we use the construction of the sensor and the microcontrolIer, and we always give the most consideration to the consumption of system while in choosing the microcontroller. So the solenoid self-induction sensor is chose for our sensor, and the MSF430F1121a for microcontrolIer which supports the number countering in the dormancy of LMP3. By considering the problem of communicating distance, nRF401 is adopted for the transmit microchip. While nRF401 is an incorporation microchip of transmitting and receiving, it is also used in the receiver.In our system, the communication is in a multicast mode. So we must consider of the data collision problem, and in the last part of our paper, we study the arithmetic for preventing the data collision. By considering the feasibility of the system, we use the ALOHA arithmetic for the system.