The design of intelligent water meter based on NEC controller

Abstract: the design of intelligent water meter based on NEC controller information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Water meter power supply by the water meter based on general it's power consumption is put forward strict requirements of water meter. International regulation, static current should be less than 30 a intelligent water meter, water meter in actual manufacturers have put the index control within 10 a ( When using the dry reed pipe sensor. More flow meter manufacturers choose model price quote you are welcome to inquire, the following is based on the NEC controller design of intelligent water meter article details. Water meter power supply by the water meter based on general it's power consumption is put forward strict requirements of water meter. The international rules, intelligent water meter static current should be less than 30 & mu; A, in the actual water meter manufacturers have put the index control in 10 & mu; (within A When using the dry reed pipe sensor) So as to ensure the work time is more than 6 years in order to be qualified. NEC 8-bit microcontroller with LCD control function for its low power consumption, high performance and other advantages, become a water meter of the micro controller good options. 1, NEC yamanashi MR and RenesasMCU meter working principle of the scheme is: put the magnet on the impeller, the magnetic field sensor ( MRSensor) Sense out of the rotation of the impeller. Magnetic field sensors ( MRSensor) Convert magnetic field signal into electrical signal, then measured by single chip microcomputer of addition or subtraction operations, operational values by the liquid crystal display (LCD) or external output. The structure scheme is as follows: 2, RenesasMCU— — 78 k0 / Lx3 micro controller 78 k0 Renesas electronics/Lx3 micro controller as a high-performance 8-bit general micro controller, using the original NEC electronics 78 k0 kernel, there are a variety of encapsulation of 48 pin ~ 80 pin, built-in 4 com / 8 com mode LCD driver, can drive LCD section number is as high as 288. Low drive LCD zui big 36 * 8 grade control can be realized, a total of 6 kinds of display mode choice, internal/external grouping voltage. Low CSI communication module 1 ~ 2 with IC card receiver, short distance wireless transceiver, ultrasonic flow sensor low abundant comparative/timer trigger acquisition of communication flow sensor signals and accurately calculate the flow through the burning of the flash data block low EEPROM simulation function block and special management mode to replace EEPROM to important data stored low oscillation circuit 78 k0 / Lx3 microcontroller built-in 8 MHZ oscillator circuit has high precision, and can register to control the speed of the internal oscillation circuit. For a water meter don't need a real time clock, can save cost and speed up progress of software development. If you need to use RTC, requires an external 32. 768 KHZ oscillator, which can be easily implement ladder compound rate of water. Low power consumption, 78 k0 / Lx3 below 1 & mu; A static power consumption can effectively prolong the service life of batteries, and to improve system stability and anti-jamming. 1. 8V～5. The working voltage of 5 v can use battery power zui big limit. Built-in level 16 LVI module is removed from the customer's worries, monitor the battery voltage at any time, once found the battery voltage drops too restricted, notify the users immediately and store critical data. NEC electronics meter scheme is a card table, support for multiple read/write CARDS, through booth using IIC agreement with micro controller communication. Micro controller with 78 k0 / Lx3, with LCD display control function, in terms of power consumption, through a variety of energy-saving measures, the whole machine reaches 3. 8μ A low power consumption. 3, NEC yamanashi MR sensor NEC yamanashi MR magnetic sensor is a kind of using the magnetic resistance reaction principle, the strong magnetic metal alloy film evaporation in the IC circuit of magnetic switch devices. The following characteristics: high sensitivity, high precision & ndash; — High sensitivity to the consistency of zui can reach within 6 gauss. Low high reliability & ndash; — Hidden within the temperature protection circuit, improved the stability of the temperature characteristic. Low low power & ndash; — 1 working current. 5 ma, working under the pulse mode, the average power consumption dropped to 0. 45uA. Low low cost. 'Small package. 4, NEC yamanashi MR sensor application solutions in water meter type magnetic sensor is suitable for the speed meter, can be divided into rotor and screw vane, the distribution of magnetic field is different, have corresponding magnetic sensor. Case 1: horizontal direction detection figure 3 horizontal magnetic induction principle case 2: vertical direction detection figure 4 vertical magnetic induction principle above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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