Low-power wireless remote transmission intelligent water meter Lorawan automatic transmission control board

1. Market demand



Due to its large population, China is a big country using water meters, but the current penetration rate of intelligent centralized meter reading is not high. In order to reduce the leakage rate, Smart Water uses grid layout of water meters, real-time data monitoring, and rapid location of pipe network problems. Leakage analysis, thereby reducing leakage and reducing complaints. Automatic meter reading is realized through the intelligent meter reading system, to prevent the disturbance of the people, "inaccurate reading", "valuation" and other phenomena caused by manual meter reading, and to improve the service level; relevant agencies predict that 100 million sets of smart water meters will be upgraded in China within 3 years Work.

At present, most traditional water meter companies use non-independent remote water meters and face the problem of water meter product modification.



2. Product introduction

Low-power wireless remote transmission intelligent water meter Lorawan automatic transmission control board is mainly suitable for terminal applications of various water meter manufacturers, water companies, and water remote meter reading systems. The main chip of the module adopts a high-performance embedded ARM Cortex-M3 32-bit RISC controller. Software multi-level detection and hardware multiple protection mechanisms ensure equipment stability.

It is composed of powerful ARM Cortex-M3 32-bit RISC chip single-chip microcomputer and Lorawan wireless spread spectrum chip. The module has no magnetic induction, main voltage acquisition circuit and water meter acquisition circuit. The realization of each function is based on the standards formed in the industry for many years. In the water meter collection circuit, it can be set up for photoelectric direct reading collection, wireless pulse collection, single reed pipe collection, double reed pipe collection and other collection methods, and there is strong magnetism. Interference protection, man-made damage alarm, low voltage alarm, data storage and other functions. People's livelihood projects such as smart cities and smart water can be easily realized.

Use with LORAWAN gateway

：

Applied to smart water meters can achieve:

●Unattended, reducing manpower

●Automatic meter reading

●Industrial-grade communication equipment ensures safe and reliable meter reading

●Provide complete system log traceability

●Visual graphics, data statistics

●Meter status alarm; when there is low power, low volume, magnetic attack, sampling failure, leakage alarm (external leakage alarm), the alarm information will be uploaded to the background application platform in real time.

●Control the water meter valve switch through the background application software (desktop, WEB and mobile APP)

●When the meter is removed or attacked by external forces, the information will be uploaded to the background application platform in real time.

●Can monitor the stability of equipment data transmission

Product schematic

：

3. Product advantages



Based on Lorawan frequency modulation technology, multi-band or narrowband IoT exclusive judgment, other frequency bands can be customized.

Micro power transmission, adjustable frequency level.

Using efficient forward error correction coding technology and frequency hopping mechanism, strong anti-interference ability and low bit error rate.

Ultra-low power consumption, sleep time and wake-up time can be set freely to adapt to power consumption.

Support background wireless setting parameters, wireless upgrade function.

Set the bottom number of the table to facilitate the synchronous counting of the mechanical and electronic acquisition modules.

Support remote valve control,

Support multiple transmission methods such as single transmission, batch transmission, full transmission, unit transmission, etc.

Support wireless data encryption function.

Provide host computer software to realize user on-site test equipment and compatibility with existing equipment




Four, technical parameters

：

Product specifications

Technical index	parameter
Rated voltage	3.6V
Working frequency	433/470MHz（Also optional780/868/915MHz）
Frequency error	+/-10ppm
Modulation	LoRa
Transmit power	20dBm
Receiving sensitivity	-140dBm
Communication rate	0.3/0.6/1.0/1.8/3.1/5.5（6 levels adjustable）
Transmission rate	0～300kbps
Communication distance	Indoor unobstructed distance：1.5km
	Outdoor open distance：3.5km
Operating temperature	-40～85°C
storage temperature	-40～125°C
Battery model (reference)	ER18505M
Service life (reference)	10 years (1 time/day)

Various other specifications are available：

五、Instructions for use：

The meter module can be modified through the upper computer software of our company, or modified through the customer's meter reading tool (for details, please call or contact us online for guidance)

(1) Tool preparation

1. A wireless module.

2. A computer with serial port or USB to serial port.

3. An intelligent remote water meter, used to set the parameters of the meter.

4、Meter reading software, module setting software (Gold Rush IoT smart energy consumption management and control platform)。

(2) Operation steps

1. Use the RS232 converter to connect the computer serial port to the module;

2. Power on the water meter module, connect the water meter to the test water flow, and place the LED light on the water meter module to keep the LED light on so that the module enters the configuration mode;

3. Open the water meter setting software and click the "Enter Configuration Mode" button of the setting software;

4. Use the RS232 converter to connect the computer serial port to the module;

5. Configure the corresponding parameters according to the meter module, and click the "write" button;

6. When the word "Normal" appears in the status bar, it indicates that the module parameters have been set, and then click "Exit" to set the mode.

Six, actual cases



On-site testing of residential corridors and top floors

In terms of communication distance, arranging nodes to the high-floor pipeline wells of building 24# (about 500 meters away from the base station) of the boundary building of the cell can provide stable communication. It can be seen that the communication distance will not be excessively attenuated without a large amount of obstruction.

Industry Classification: Industrial Electronics

Development platform: STM STMicroelectronics

Delivery form: PCBA

Performance parameters: rated voltage 3.6v, modulation method, lora

Application scenarios: residential corridors, top floors, homes.