The Design And Realization Of Photographing And Direct Reading Remote AMR System

At present, living standard of our country is increasing day by day because of the ever-developing city construction and improvement of housing constructions. At the same time, people’s requirements for intelligent living facilities are also growing, one of them is for the traditional water service. The traditional way of meter reading requests door-to-door visit, as its weakness, is becoming unable to meet the needs of the current intelligent household situation increasingly. As a result, automation of meter reading is an inexorable trend. Authorized by relevant enterprises to develop intelligent meter products, this article mainly research a kind of automation meter reading using a camera to collect the image of the tranditional water meter, including the design and realicze of it.This paper begins with consult relevant information and understand the way of automatic meter reading (AMR) industry, and then analyze them, based on actual demand of the project, this paper contrasts two plans of meter reading scheme and reading method, after analysis and selection of them. The paper proposes a kind of automation meter reading using a camera to collect the image of the water meter and transmitting it using RS485bus. This article includes conceptual design, hardware circuit design and the design of driver and application. The following work has been done.(1) Designing hardware circuit, including the water meter header subsystem unit and the handheld device subsystem unit. The header subsystem can be subdivided to the LM1117power unit, OV7670image acquisition unit, STM32F103RET6Minimum system unit and the MAX1483data send-receiver unit. The handheld device subsystem can be subdivided to the power management and charge and discharge unit using CN3052, AMS1117and TPS76333, STM32F103ZET6minimum system, STM32extending SRAM unit, MAX1483data send-receiver, SD card storage unit, TFT liquid crystal display unit and key control unit. In addition both the two pieces of circuit boards share the same JTAG simulation interface circuit.(2) The part of software can be divided to the design of driver and the design of application. The design of driver is mainly editing codes that drive the hardware, which includes the STM32chip, OV7670chip, MAX1483chip, LED light-compensating lamp and the TFT screen, membrane keyboard, CH376S (file management system), extending SRAM chip, SD card and so on. The design of application includes two parts, one part is the Modbus field bus codes embedded in header subsystem application layer protocol which is applied in order to realize the function to transfer from point to point, and the other part is in the handheld device subsystem using STM32to control the send, receive and storage of the image data information.(3) For hard ware, from designing the schematic diagram to drawing the footprints of components, and then PCB sketch. Then is the choosing and ording of every electron component and the welding of them. At last the debugging process was completed. For software, from driving code of parting function of the system, first is initialization of STM32, then the driven of LED light-compensating lamp, from RS232to RS485, and OV7670chip, Modbus protocol, and the TFT screen, membrane keyboard of the handheld device subsystem unit. The integratting and debugging of the whole System is the last task.The system runs well and fulfills the preset requirements that the function of multiple water meter head units respectively photographing and remote automatic meter reading have been achieved.