MCU PIC16C7X in low-power recognition application of meter reading

: SCM PIC16C7X in low-power recognition meter application information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: at present, a lot of the meter reading system of the industry, are generally stay in manual copying and artificial aggregate level. With the further development of economic reform, people require information timely, accurate and comprehensive; Obviously, the manual copy cannot meet the needs of the economic life. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a microcontroller PIC16C7X in low-power identification details of the application of the meter reading articles. Meter reading system, at present, many in the industry generally stay in manual copying and artificial aggregate level. With the further development of economic reform, people require information timely, accurate and comprehensive; Obviously, the manual copy can't meet the requirements of economic life. This paper introduces a kind of meter reading system using single chip microcomputer control, a number of information can be recorded with low power consumption, low cost, easy to carry, easy to operate etc, very suitable for power plants, chemical plants and other related industries meter reading system. 1, the overall structure of the system and working principle of the system by the information inquiry, read, communication, computer composition. Will a contains specific identity information & other Information button & throughout; In a fixed position, the position may be a device or a part, many table display devices are installed on equipment running status. Staff regularly or not regularly record data, with carry & other Read apparatus & throughout; Read the information button and extract the information in the information button and stored in & other; Read apparatus & throughout; Inside, the information in the information button marking the equipment, then put the device on each table reading commend one by one through read on keyboard input and stored in & other; Read apparatus & throughout; Within; At the end of the inspection, use and other Communication throughout the &; Through the network will be stored in & other; Read apparatus & throughout; Within the information sent to the computer for processing, technical personnel and management personnel can accurately grasp the site equipment, and in a timely manner to understand the equipment operation and management of the existing problems. With the information in the information button has *, not imitation, not artificial forgery, the characteristics of an information button can only identify a device or an area, and read the device contains the clock chip, read the information button at the same time, record the time. The system is used for management and technical analysis is very convenient and practical. Considering the site condition, some equipment and department communication bridge between the computer and the monitor and remote transmission mode, short-range through RS232 serial port transmission, remote use MODEM via wire transfer. In this system, low power consumption, portable reading device design and manufacturing is the core and key. 2, low power design of portable read 2. 1 design principles in this system there are two design requirements: (to read 1) Small and exquisite, convenient to carry; （ 2) Battery power, reactive power must be small, extend battery life. According to these two requirements, in the design is the patch package that USES high integration chip, the second is the chip peripheral components as less as possible. Through the screening of several types of CPU, in this system, we adopt the Microchip company PIC16C74 as CPU, the chip special meet above requirement. PIC16C74 has 44 tube feet, I/O pins, an internal, can save a lot of peripheral components, reducing system power consumption. 2. 2 pic16c74 microcontroller PCI16C74 SCM is a kind of low power consumption, high performance chip. Due to using static CMOS design, power operation energy consumption is low, and very reliable. Piece inside the electric circuit and reset circuit, monitoring timer on the RC oscillator circuit selection, etc. , do not need to increase the function of the high price of piece of outside support components, which reduces the system cost and power consumption. PIC of the small chip size and Microchip companies advanced CMOS technology improves the performance of the chip has a wide range and low current ( Typical values: in 3 v, 32 KHZ when working current is 15 & mu; 一) And remote standby current ( Dormancy mode 3 v work conditions is greater than 1 & mu; 一) 。 Low current characteristic is applied to long life battery is very ideal. The chip inside with eight high-speed A/D conversion channel, when the need for A/D conversion, can save the additional A/D conversion peripheral parts. USES the advanced class & ndash; RISC structure, Harvard dual bus structure, the two stage instruction pipeline structure, with a magnitude 8 stack, multiple internal and external interruption, only 35 instructions, easy programming, software code, less execution speed. The chip also with dormant ( 睡眠) Function, perform a SLEEP instruction, chip went into SLEEP mode. You can wake up by internal or external interrupt chip, the chip back into the normal working state [ 2] 。 3, read the information button in the design of this system, in order to make our products more wide application range, use more widely, considering the various industries have different demands, application environment and there is a big difference between different site, the information button is installed in the application field, so the design of read can read two kinds of model information button, according to the actual situation of user recommend feasible scheme.

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