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Bluetooth module makes electricity meter wireless

In the past, traditional power quality monitoring used a large number of pointers or LED displays to display power quality and status. However, the first generation of integrated electricity meters developed at the back end used computer technology to convert analog power signals into digital signals, which can then communicate through RS485. The system transmits the power quality data back to the microcontroller (PLC) for information storage and reading.


In the past, traditional use relied entirely on human work records. Someone needed to monitor a large number of instruments such as voltmeters, ammeters, phase meters, etc. 24 hours a day, and manually record relevant data. Power information required a huge cost to obtain. However, after the introduction of integrated electricity meters, although After digitization, data can be monitored and recorded using PLC instead of manual labor, which reduces labor costs. However, in order to achieve comprehensive monitoring, in addition to a large amount of wiring, engineers are also required to modify customized programs according to on-site conditions and regularly monitor the data. Manually extract data.


Huawei IoT has been deeply involved in areas such as power measurement and Bluetooth wireless for many years. In view of the increasing energy demand of the green energy industry, it has proposed a future new generation wireless integrated electricity meter plan since the end of 2022, using nRF52840 as the At the core of the main architecture, the 32-bit ARM® Cortex™-M4 CPU integrates voltage detection, current detection, power quality calculation, and wireless data transmission, significantly reducing the size of the meter and saving hardware costs.


Installing electricity meters in the early stage does not require a lot of wiring, and later saves a lot of line maintenance costs. Moreover, after completing the simple construction of the communication system, the power quality and power consumption in each area can be monitored in real time, and abnormal warnings can be proactively received. It is necessary to pay attention to whether the power consumption is abnormal at any time. It also allows users to quickly understand the power consumption trend from the graphical report, assess future power demand in advance and prepare power saving plans in advance.


Simply put, the built-in communication connection function of the wireless integrated electricity meter eliminates the need for manual recording, and does not require the establishment and maintenance of communication lines. It saves a lot of costs and expenses, allowing users to understand their electricity usage habits and thereby save electricity. , saving valuable power resources.


Huawei IoT ultra-miniature wireless Bluetooth modules DK9177A, DK9181A, DK9183A, SoC all use nRF52840. The wide voltage power input can choose to use 3.3V or 5V power supply and lithium battery according to the system requirements. A set of full-speed USB devices can be used It transmits data and provides power. It has multiple communication protocols such as high-speed SPI, QSPI, I2C, and UART. The digital pins have rich ADC, GPIO, and PWM for flexible peripheral applications.


It also provides NFC-A pins to simplify pairing and Payment Plans. It also has built-in high-sensitivity antenna, precision chip antenna and I-PEX external PCB antenna (optional) to suit various housing configurations. The wireless part supports Bluetooth Low Energy, Bluetooth Mesh, Thread, Zigbee, 802.15.4, ANT and 2.4 GHz proprietary protocol stack. Minimize costs by minimizing circuit parts count.

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