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[Meter's Latest Patent] An Internet of Things Smart Water Meter
[Chinese instrument network meter patent] creative limit, instrumentation invention. Today we introduce a national invention-authorized patent - an Internet of things smart meter. The patent was applied by Chengdu Zunhua Rongyu Technology Co., Ltd. and obtained the authorization announcement on January 26, 2018.
Content Description
The invention relates to the field of flowmeters, and in particular to an intelligent water meter based on internet of things.
Background of the invention
At the present stage, the Internet of Things meter, smart meter, and electronic meter reading meter use non-electricity electricity measurement technology to convert the flow signal measured by the mechanical meter into the final digital electronic signal; for example, the installation of a rotating mechanical measuring gear. A reed switch is installed near the magnet and the non-electricity simulation data of the water meter's mechanical measurement is converted into a digital signal that can be operated and recognized by the electronic circuit, thereby realizing analog/digital (A/D). Conversion. Measured by mechanical measurement is a mechanical analog signal, and finally the cumulative amount of water supply is represented by a mechanical numeric character wheel; and the management control after charging and charging is an electronic digital signal, and the electronic digital quantity is converted into an analog quantity of the water supply (D/A Conversion). This kind of work mode, which performs analog/digital (A/D) and digital/analog (D/A) conversions on a mechanical meter and is used for electronic control, has major drawbacks. At the same time, there are two types of metering data and two kinds of metering results. Its detection accuracy has yet to be improved. As a result, the monitoring center cannot obtain accurate and effective water meter flow information.
Summary of the Invention
The purpose of the present invention is to provide an intelligent water meter based on the Internet of Things, which not only allows the monitoring center to wirelessly inquire about the parameters of the pipeline flow, but also greatly improves the detection accuracy.
The Figure is a functional block diagram of the present invention
The present invention is implemented by the following technical solutions: An intelligent water meter based on the Internet of Things, including a microprocessor, an LCD display, a flow sensor, a wireless communication module, a solenoid valve, a solenoid valve driving module, an intelligent gateway, a monitoring center, and a microprocessor; Respectively connected to the flow sensor, LCD display, wireless communication module, and solenoid valve driving module; the wireless communication module communicates with the monitoring center via an intelligent gateway; and the flow sensor includes a control module, a digital-analog conversion module, and an ultrasonic transducer that are connected in sequence. , Signal conditioning circuit; signal conditioning circuit is also connected with the microprocessor.
The signal conditioning circuit includes a voltage amplification circuit, a band-pass filtering circuit, a self-gain amplification circuit, and an analog-to-digital conversion module that are connected in sequence. The voltage amplification circuit is mainly composed of an RC circuit and an operational amplifier. When it is used, firstly, the flow sensor performs flow detection on the water pipeline, the control module in the flow sensor sends a detection drive signal, and the drive information converts the digital signal into an analog signal through the digital-to-analog conversion module, and the analog signal is used by the ultrasonic transducer. After receiving, the transmitter in the ultrasonic transducer converts the electrical energy into ultrasonic energy. The ultrasonic energy is reflected in the water pipe and then received by the receiver in the ultrasonic transducer. After receiving the reflected ultrasonic energy, the signal is reflected by the signal. Modulation circuit for signal modulation, after signal amplification, filtering, analog-digital conversion, the detected digital signal.
The detected digital signal is received by the microprocessor and processed to obtain the final flow data. The flow data is displayed on the one hand through the LCD display connected with the microprocessor; on the other hand, it is sent to the smart gateway through the wireless communication module. The intelligent gateway collects a plurality of intelligent water meter information and then converts the network. The unified information is sent to the control center for information query, and the electromagnetic valve can be controlled to open and close the water flow through the query result.
In order to better implement the present invention, further, the wireless communication module is a ZigBee module. The ZigBee module is used here because it is compared with similar wireless technologies such as WIFI and Bluetooth. The ZigBee module has the characteristics of low power consumption, short delay and high reliability, and has a large network capacity and can accommodate more than 60,000 node devices. Suitable for use as a sensor network, cost is not high, with a very high cost performance. The control module is the FPGA minimum system module. The minimum FPGA system includes the chip EP4CE10E22C8N, the reset circuit, the first clock circuit, and the Flash memory module that are respectively electrically connected to the chip EP4CE10E22C8N. The chip EP4CE10E22C8N has a good control over the working process of the entire flowmeter and the reset circuit. The first clock circuit and the flash memory module ensure that the minimum FPGA system can operate stably and normally, even if an error occurs. The electromagnetic valve drive circuit is mainly composed of a transistor Q1 and a relay K1. The solenoid valve driving circuit composed of a triode and a relay not only has a simple structure but also has high control accuracy and is very practical. The microprocessor is a microcontroller processor. The specific use of AT89C51 is not only compact and easy to install, but also has the advantages of low power consumption and low cost.
Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention achieves high-speed storage and high-speed processing of signals by using the FPGA minimum system as a control module, and can obtain high-precision calculation results and greatly increase the flow rate. The accuracy of the meter, and through the establishment of wireless communication module, to achieve remote query of the meter reading information and the precise control of the water flow, to avoid manual inspection and improve work efficiency.
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