Design scheme of intelligent water meter based on NEC controller

Abstract: The information of intelligent water meter design scheme based on NEC controller is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The power supply of the water meter is generally supplied by the water meter itself, which imposes strict requirements on the power consumption of the water meter. According to international regulations, the quiescent current of a smart water meter should be less than 30A. In practice, water meter manufacturers control this indicator within 10A (when using a reed switch sensor. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is based on NEC controller smart water meter design article details. The power supply of the water meter is generally supplied by the water meter itself, which puts forward strict requirements on the power consumption of the water meter. International regulations, the quiescent current of the smart water meter should be less than 30μA. In practice, water meter manufacturers control this indicator at 10μWithin A (when using a reed switch sensor), it is qualified to ensure that the working time is more than 6 years. NEC's 8-bit microcontroller with LCD control function has become a high-quality choice for water meter microcontrollers due to its low power consumption and high performance. 1. NEC Yamanashi MR and RenesasMCU water meter scheme The working principle of this scheme is: install a magnet on the impeller, and the rotation of the impeller is sensed by the magnetic field sensor (MRSensor). The magnetic field sensor (MRSensor) converts the magnetic field signal into an electrical signal, and then the addition or subtraction operation of the measurement is performed by the single-chip microcomputer, and the operation value is displayed by the liquid crystal or externally output. The block diagram of the scheme structure is as follows: 2. RenesasMCU——78K0/Lx3 Microcontroller Introduction Renesas Electronics 78K0/Lx3 Microcontroller is a high-performance 8-bit general-purpose microcontroller. It adopts the original 78K0 core of NEC Electronics. , the number of LCD segments that can be driven is up to 288 segments. ●The LCD driver can realize the maximum 36*8 segment control, there are 6 kinds of display modes for selection, internal/external grouping voltage. ●CSI communication modules 1~2 can communicate with IC card receivers, short-range wireless transceivers, ultrasonic flow sensors ●Abundant comparison/trigger timers to collect flow sensor signals and accurately calculate the flow ●EEPROM emulation function through flash data Programming and special management methods replace EEPROM to store important data ●Oscillation circuit The 78K0/Lx3 microcontroller has a built-in high-precision 8MHz oscillation circuit, and the speed of the internal oscillation circuit can be controlled through registers. For water meters that do not require a real-time clock, it can save costs and speed up software development. If you need to use RTC, you need an external 32.768kHz oscillator, which can easily realize stepped multi-rate water bills. ●Power consumption 78K0/Lx3 is lower than 1μThe static power consumption of A can effectively prolong the service life of the battery, and is conducive to improving the stability and anti-interference of the system. The working voltage of 1.8V ~ 5.5V can maximize the use of battery energy. The built-in 16-level LVI module eliminates the worries of customers, monitors the battery voltage at any time, and immediately informs the user and stores key data once the battery voltage drops excessively. The NEC electronic water meter solution is a card meter solution, which supports a variety of reading and writing cards, and communicates with the microcontroller through the card holder using the IIC protocol. The microcontroller adopts 78K0/Lx3 with LCD display control function. In terms of power consumption, through various power saving measures, the whole machine reaches 3.8μA's ultra-low power consumption. 3. NEC Yamanashi MR sensor NEC Yamanashi's MR magnetic sensor is a magnetic switch device that uses the principle of magnetoresistance reaction to vapor-deposit a ferromagnetic metal alloy film on an IC circuit. Its characteristics are: ● high sensitivity, high precision——The consistency of sensitivity can be up to within 6 Gauss. ●High reliability——Built-in temperature protection circuit greatly improves the stability of temperature characteristics. ●Low power consumption——The working current is 1.5mA, and in pulse mode, the average power consumption can be reduced to 0.45uA. ●Low cost. ●Small package. 4. Application scheme of NEC Yamanashi MR sensor in water meter Magnetic sensor is suitable for speed type water meter. It can be divided into rotor type and screw type. The magnetic field distribution is different, and there are corresponding magnetic sensors. Case 1: Detection in horizontal direction Figure 3 Principle of horizontal magnetic induction Case 2: Detection in vertical direction Figure 4 Principle of vertical magnetic induction The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Design Scheme of Smart Water Meter Based on NEC Controller'

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