Ultra low power consumption water quality online monitoring system based on GPRS

Case background

In recent years, with the progress of society and the development of economy, science and technology, people's living, working and production levels have been greatly improved. Rainfall monitoring system is of great significance to study the characteristics of precipitation, especially rainstorm, and plays an important role in the formulation of national economic departments such as agriculture, urban construction, telecommunications, transportation, water conservancy and disaster prevention and reduction strategies. Under the background of GPRS, the wireless water level monitoring station came into being.

Scope of application

Remote monitoring and management of meteorological monitoring, geological security and natural disaster measurement

Urban water, heat and gas pipe network monitoring system

Temperature, humidity and grain condition monitoring system

Remote measurement and control system of river water level valve

Remote control system of outdoor advertising screen

Remote data transmission system of Meteorological Station

Remote measurement and control system of water source well

Oil well remote monitoring system

High voltage switch telecontrol control system

system composition

The rainfall and water level remote monitoring system is mainly composed of dispatching center, rainfall monitoring center, communication platform, rainfall remote measurement and control terminal, measurement and measurement (tipping bucket rain gauge, water level gauge, anemometer, etc.) equipment and power supply equipment (solar panel or mains power supply is required for real-time online mode).

GPRS based remote monitoring system for rainfall and water level)

System functional features

The rainfall and water level monitoring personnel can remotely monitor the rain gauge signal, water level gauge signal, wind speed signal, solar panel voltage, etc., and can remotely set the return time. When the GPRS network cannot be connected, it can be stored locally and sent back to the server again when GPRS is reconnected. When it is used for water level monitoring of reservoirs, lakes and other water levels, if the water level exceeds the upper and lower limits, it will automatically send early warning messages.

Hardware and software support

Hardware Introduction (rtu4100-l)

Rtu4100-l

1. Product introduction

1) Product features

Power supply mode of 3.7V lithium battery

Provide RS232 and RS485 communication interfaces

Ultra low power consumption, standby current as low as 25-35 µ a, suitable for long-term work in the field

Various standby working modes can be customized

Support server configuration time

Support Modbus ASII and RTU protocols

Support custom handshake package and heartbeat package

Have a unique ID number

Only Automatic wake-up mode is adopted, and 3ua-4ua can be achieved in standby mode.

Collect the information of 4 sensors regularly and store it in flash

It can provide DC12V power supply to the sensor

Connect with the server regularly and upload the collected data

2) Relevant information

General dtu4100 instructions

Low power configuration software

DTU configuration software

Ultra low power GPRS specification

3) Workflow

Normal standby

When the timing acquisition time is up, wake up the equipment, collect data, store the collected data and stand by.

When the scheduled return time is up, wake up the device, online server, upload data and standby.

It supports four standby modes: week, hour, minute and interval

In case of alarm, immediately start up and send back data to the server;

In case of emergency alarm, you can send text messages to 8 people according to the preset text message content;

[interval time] can be configured as 0-65535 second interval.

[week] mode can be accurate to the minute time of each day in a week, and can be configured as 1-7 time points to realize fixed-point wake-up.

[hour] mode can be accurate to the minute of every day, and can be configured as 1-7 time points to realize fixed-point wake-up.

[minute] mode can be accurate to the minute time in each hour, and can be configured as 1-7 time points to realize fixed-point wake-up.

4) Power consumption calculation

Rtu-l series is mainly divided into three working modes

Timing mode, alarm mode and networking mode

The scheme adopted in this scheme is the combination of alarm mode and networking mode

If each networking communication time is 2 minutes, the working time of one 10Ah battery is:

Calculation method:

Assuming that the network is connected all the time, the working time is 10000 / 80 = 125 hours = 7500 minutes = 3750 times

Assuming that the number of networking times per day is 1, the working time is 3750 days

Assuming that it is always in the alarm mode, the consumption current of one year is: 33 * 24 * 365 UA = 289080ua = 289ma, accounting for about 1 / 34 of the total electricity

A. Software function

Remote monitoring of rainfall, water level, wind speed and other signals.

Remotely set the system working mode (low power consumption, normal working mode).

Support the storage and historical record query of various monitoring information, control information, alarm information and operation information.

Generate various data reports and data curves.

B. Software screenshot

real-time display

1. The device list on the left shows the information of current online and offline devices. When the device is connected to the network, it will enter the "online device list" from the "offline device list". If the device is not online for a long time, it will enter the "offline device list" from the "online device list";

2. The upper right corner displays the equipment number, user name, contact person, telephone, fax, mobile phone, SIM card number, address and other information;

3. The upper left corner displays the rain gauge, water level gauge, anemometer, solar panel and other information;

4. The curves of rain gauge, water level gauge, anemometer and solar panel are displayed in real time under the window;

5. The middle text prompts the current equipment login time and the last time of collecting and returning data;

Software interface of rainfall and water level remote monitoring system based on GPRS

Historical records

Users can search history according to time period;

The history record will be drawn on the window in the form of curve, and the history record can be displayed under the window in the form of list. Through the history record, the equipment operation status and relevant trend can be viewed;

The history records queried at the same time can be exported to excel;

History record of rainfall and water level remote monitoring system based on GPRS

Effect drawing of configuration software

Users can customize the program through configuration software according to their needs, so that the interface expression form is more flexible;

C. Advantage characteristics

When the water level exceeds the limit on site, the site controller can send an alarm message.