Design and Research of Automatic Wireless Meter Reading System

Abstract: The design and research information of the automatic wireless meter reading system is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: This paper proposes a wireless automatic meter reading system, which has good communication quality, low cost, reliable operation, economical and practical, and can copy the user's three meter data accurately and timely. It is an ideal automatic meter reading solution. , which is also a meter reading. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the design and research article details of the automatic wireless meter reading system. This paper proposes a wireless automatic meter reading system, which has good communication quality, low cost, reliable operation, economical and practical, and can copy the user's three meter data accurately and timely. It is an ideal automatic meter reading solution. It is also the development trend of the meter reading charging system. 1. Structure of meter reading system The meter reading system is mainly composed of main station, GPRS communication channel, concentrator, low-voltage power line network, data collector, and user meter. The working principle of the system is to use the low-voltage power line or RS-232 bus to transmit the meter data from the collector to the concentrator, and then the concentrator transmits the signal to the GPRS network in time or in real time. Finally, the computer of the main station receives the data on the Internet and performs related processing such as user meter data aggregation, electricity metering, and line loss analysis. The system can be used to copy the data of three or more tables within the family. The lower layer of the system is directly connected with water meters, electricity meters, gas meters, etc., and the upper layer is connected with the host of the meter reading center to realize remote copying of data. The system generally uses passive meter reading. When the upper module receives the meter reading command from the meter center, it sends the meter reading command to the lower module by wireless. The overall framework of the wireless meter reading system is shown in Figure 1. 2. Introduction of main devices 2.1 Main features of AT89S52 A89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8k in-system programmable F1ash memory. The on-chip F1ash allows program memory to be in-system programmable, also suitable for conventional programmers. On a single chip, with a smart 8-bit CPU and in-system programmable Flash, the AT89S52 provides a highly flexible and ultra-effective solution for many embedded control application systems. A89S52 is compatible with MCS-5l single-chip microcomputer products, with 8k bytes of in-system programmable F1ash memory, 1000 erasing cycles, full static operation: OHz ~ 33Hz, three-level encrypted program memory, 32 programmable I/O ports, Three 16-bit timers/counters, eight interrupt sources, full-duplex UART serial channel, low-power idle and power-down modes, wake-up from power-down interrupt, watchdog timer, dual data pointer, power-down identifier. 2.2CC1100 main performance CC1100 is a low-cost true monolithic UHF transceiver, designed for low-power wireless applications. The circuit is mainly set to the ISM (Industrial, Scientific and Medical) and ISRD (Short Range Device) frequency bands at 315, 433, 868 and 915MHz, but can also be easily set to 300~348MHz, 400~464MHz and 800~928MHz other frequency bands. The RF transceiver integrates a highly configurable modem. Its data transfer rate can reach 500kbps. Performance can be improved by turning on the forward error correction option integrated on the modem. The CC1100 provides extensive hardware support for packet processing, data buffering, burst data transfer, clear channel assessment, connection quality indication and electromagnetic wave excitation. The main operating parameters of the CC1100 and the 164-bit transmit/receive FIF0 (first-in-first-out stack) can be controlled via the SPI interface. 3. Hardware design The control of the transmitting module and the receiving module by the single-chip microcomputer must first initialize the interface of the single-chip microcomputer (SPI bus interface technology is a high-speed and high-efficiency serial interface technology, which is mainly used for expanding peripherals and data processing. Exchange.), and then initialize the radio frequency module. In this part of the initialization, power on the reset chip and configure its on-chip registers. When the transmitter transmits a set of data, it must first pass the port pair, set the number of data to be sent at a time in the buffer, and then write the data packet to be sent. Wait for the end of this transmission, and finally flush the buffer, and this transmission is completed. When the receiving end receives a set of data, it first enters the receiving mode, waits for the completion of receiving the information, then the received data packets are decomposed, all the received data are read out and stored, and finally the buffer is cleaned, and the reception is completed this time. CC1100 has many features such as packet processing mechanism, sending and receiving FIF0, WOR mode (WakeonRadio). The wireless transceiver chips before CC1100 all use the synchronization method to send the data bit by bit. This method is more troublesome to process when sending and receiving data, and it is necessary to judge the preamble word and the synchronization word when receiving. And CC1100 undertakes these tedious tasks,When you need to transmit data, you only need to write the transmitted data into the transmitting FIF0 through the SPI port according to a certain format, and then configure the CC1100 to transmit state, and the data will be transmitted as required; when you need to receive data, first put the CC1100 Configured as receiving state, once received data that meets the requirements, CC1100 will store the received data in the receiving FIF0, and there will be a pulse on pin GD00 or GD02. This pulse can be used to notify the MCU that a data packet has been received. After being received by CC1100, the MCU can take out the data received by CC1100 through the SPI port.

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