KR102229138B1 - The portable wireless sensor system for realtime measuring water quality based on internet of things - Google Patents

Abstract

A portable wireless sensor system for real-time water quality measurement based on IoT according to an embodiment of the present invention includes an acidity measurement unit for measuring the acidity (pH) of water to be measured, a turbidity measurement unit for measuring turbidity of water, and water dissolution. Dissolved oxygen measurement unit for oxygen (DO) measurement, water temperature measurement unit for water temperature measurement, control unit for controlling the operation of the system, power supply unit for supplying power to the system, and data communication with the inside or outside of the system A communication unit, acidity measurement unit, turbidity measurement unit, dissolved oxygen measurement unit, water temperature measurement unit, control unit, power supply unit, and a housing to accommodate the communication unit are included, and the housing may be formed of a material capable of waterproofing, antifouling, and floating on water. have.

Description

IoT-based portable wireless sensor system for real-time water quality measurement {THE PORTABLE WIRELESS SENSOR SYSTEM FOR REALTIME MEASURING WATER QUALITY BASED ON INTERNET OF THINGS}

The present invention relates to a portable wireless sensor system for real-time water quality measurement based on IoT.

The water quality measurement system refers to a system that measures the state of water for water resources such as nearby rivers, ponds, and rivers that are commonly found in our daily life. This system has installed and operated an automatic water quality measurement network for reasons that require constant monitoring and early warning of water pollution accidents in vulnerable areas of water pollution accidents. In Korea, automatic water quality measurement networks are installed and operated by the Ministry of Environment, National Institute of Environmental Sciences, Korea Environment Corporation, and local environmental offices.

The main water quality measurement items include not only water temperature, but also hydrogen ion concentration, dissolved oxygen content, turbidity, and various other items. The hydrogen ion concentration is a numerical value representing the degree of acidity and alkalinity of a substance, and the turbidity is a numerical measure of the degree of cloudiness of water.

Water pollution is becoming more frequent and accelerated due to industrialization, and the need for a device (system) to measure and monitor water quality in real time in nearby rivers, ponds, and rivers is increasing. There is an urgent need to develop technology for wireless systems.

1. Republic of Korea Patent Publication No. 10-2015-0070786 (Publication date: 2015.06.25)

An object of the present invention is to provide a portable wireless sensor system for real-time water quality measurement based on IoT for monitoring and measuring water quality in real time in rivers, ponds, and rivers.

As an embodiment of the present invention, a portable wireless sensor system for measuring IoT-based real-time water quality may be provided.

A portable wireless sensor system for real-time water quality measurement based on IoT according to an embodiment of the present invention includes an acidity measuring unit for measuring the acidity (pH) of water to be measured, a turbidity measuring unit for measuring turbidity of water, and water dissolution. Dissolved oxygen measurement unit for oxygen (DO) measurement, water temperature measurement unit for water temperature measurement, control unit for controlling the operation of the system, power supply unit for supplying power to the system, and data communication with the inside or outside of the system A communication unit, acidity measurement unit, turbidity measurement unit, dissolved oxygen measurement unit, water temperature measurement unit, control unit, power supply unit, and a housing to accommodate the communication unit are included, and the housing may be formed of a material capable of waterproofing, antifouling, and floating on water. have.

The housing further includes a ventilation unit for constant temperature and humidity, and the power unit may include at least one solar cell exposed to the outside of the top surface of the housing.

In addition, the acidity measurement unit, the turbidity measurement unit, the dissolved oxygen measurement unit, and the water temperature measurement unit are inserted into the water to perform each measurement, and the acidity measurement unit includes a glass electrode and a comparison electrode, and is compared with a glass electrode by water. The acidity is measured based on the potential difference generated between the electrodes, and the turbidity measurement unit collects the amount of light in the water after shooting light into the water and measures the turbidity based on the collected light amount. The positive electrode, the negative electrode, and the diaphragm disposed between the electrodes are included, and the amount of dissolved oxygen (DO) is measured based on the change in the current value generated as oxidation and reduction reactions occur at each electrode by water passing through the diaphragm. , The water temperature measuring unit includes a metal oxide thermistor whose resistance value varies according to a change in temperature, and the water temperature may be measured based on a change in an output value through the thermistor.

The system according to an embodiment of the present invention further includes a storage unit for storing data measured through each measurement unit, and at least one hook and a plurality of holes for connecting the bracket may be provided in the housing. I can.

In addition, a mobile router may be included in the communication unit, and communication with other external devices may be possible according to at least one of short-range communication and long-distance communication through the communication unit.

Using a portable wireless sensor system for real-time water quality measurement based on IoT according to an embodiment of the present invention, hydroxide ions (pH), turbidity, temperature, dissolved oxygen, which are major water quality evaluation items in various water sources such as rivers, rivers, and ponds. Measurement values for (DO) etc. can be obtained easily and relatively accurately. In addition, the measured values can be systematically managed by being stored in a storage unit (ex. DB).

Measured values for water quality evaluation can be provided to other devices in the vicinity or remote locations through various communication techniques such as Wi-Fi, LTE, and LTE CAT-MI, and users can use the provided data to quickly and accurately evaluate water quality. I can.

In the system according to an embodiment of the present invention, an auxiliary battery or the like is built-in, and the auxiliary battery may be stored by wire or wirelessly. In addition, since a solar cell or the like may be provided exposed to a housing in order to produce electric energy using sunlight, a stable power supply is possible, and accordingly, it can be used for a long time regardless of the location. .

1 is a block diagram of a portable wireless sensor system for real-time water quality measurement based on IoT according to an embodiment of the present invention.
2 shows a system according to an embodiment of the present invention.
3 shows an example of application of a system according to an embodiment of the present invention.
4 shows an implementation example of a system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification.

The terms used in the present specification will be briefly described, and the present invention will be described in detail.

Terms used in the present invention have selected general terms that are currently widely used as possible while taking functions of the present invention into consideration, but this may vary according to the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

When a part of the specification is said to "include" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, terms such as "... unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. . In addition, when a part is said to be "connected" with another part throughout the specification, this includes not only the case of being "directly connected", but also the case of being connected "with another element in the middle."

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a portable wireless sensor system for measuring IoT-based real-time water quality according to an embodiment of the present invention, FIG. 2 is a system according to an embodiment of the present invention, and FIG. 3 is a block diagram according to an embodiment of the present invention. Example of using the system according to the embodiment, Figure 4 shows an implementation example of the system according to an embodiment of the present invention.

As described above, the water quality measurement system is a system that measures the state of water in water resources such as nearby rivers, ponds, and rivers, which are commonly found in our daily life. Such a system is a system that monitors water source pollution at all times in vulnerable areas. For early warning of water pollution accidents, an automatic water quality monitoring network is installed and operated at the national level. In particular, facilities such as an automatic water quality measurement network may be inferior in mobility in that they are installed directly in the water source as a fixed type. As a countermeasure to this, the social and technical necessity of a portable wireless sensor system for real-time water quality measurement based on IoT according to an embodiment of the present invention is strongly emerging.

The portable wireless sensor system 1000 for real-time water quality measurement based on IoT according to an embodiment of the present invention includes an acidity measuring unit 1100 for measuring the acidity (pH) of water to be measured, and for measuring turbidity of water. Turbidity measurement unit 1200, dissolved oxygen measurement unit 1300 for measuring dissolved oxygen (DO) of water, water temperature measurement unit 1400 for measuring the temperature of water, control unit 1500 for controlling the operation of the system, as a system A power supply unit 1600 for supplying power, a communication unit 1700 and an acidity measurement unit 1100 for data communication with the inside or outside of the system 1000, a turbidity measurement unit 1200, and a dissolved oxygen measurement unit 1300 , A water temperature measurement unit 1400, a control unit 1500, a power supply unit 1600, and a housing 100 in which the communication unit 1700 is accommodated, and the housing 100 is a material capable of waterproofing, antifouling, and floating on water It can be formed as

In order to measure water quality in various water sources, that is, rivers, farms, flowing rivers, etc., by using the system 1000 according to an embodiment of the present invention, data according to various water quality indicators (items) are measured, and the measured values are remotely It can be provided as a cloud server or a database server of a water quality management organization or company through a communication method mobile communication network (ex. LTE, etc.) or a short-range communication method (ex. Wi-Fi, etc.).

In other words, in the system according to an embodiment of the present invention, the acidity measurement unit 1100, the turbidity measurement unit 1200, the dissolved oxygen measurement unit 1300, and the water temperature measurement unit 1400 are inserted into the water to measure each The acidity measurement unit 1100 includes a glass electrode and a comparison electrode, and the acidity is measured based on the potential difference generated between the glass electrode and the comparison electrode by water, and the turbidity measurement unit 1200 Turbidity is measured based on the amount of light collected by collecting the amount of light in the water after shooting light, and the dissolved oxygen measuring unit 1300 includes a positive electrode and a negative electrode, and a diaphragm disposed between the electrodes, and passes through the diaphragm. The amount of dissolved oxygen (DO) is measured based on the change in the current value generated as oxidation and reduction reactions occur at each electrode by one water, and the water temperature measurement unit 1400 has a resistance value that varies according to the change in temperature. A metal oxide thermistor is included, and water temperature may be measured based on a change in an output value through the thermistor.

The acidity measurement unit 1100, the turbidity measurement unit 1200, the dissolved oxygen measurement unit 1300, the water temperature measurement unit 1400, the control unit 1500, the power supply unit 1600, and the communication unit 1700 may be referred to as an enclosure. It may be accommodated in the housing 100. According to an embodiment of the present invention, the system 1000 includes an acidity measuring unit 1100 for measuring the acidity (pH) of water to be measured, a turbidity measuring unit 1200 for measuring turbidity of water, and dissolved oxygen in water. (DO) A dissolved oxygen measuring unit 1300 for measuring and a water temperature measuring unit 1400 for measuring a temperature of water may be included, and each element may be formed to be waterproof. In addition, since it may be connected to the control unit 1500 through a long cable of several to tens of meters or more, accurate data measurement is possible even at a relatively long distance (ex. several meters or more).

The acidity measuring unit 1100 is used to measure the acidity or alkalinity of a solution such as water, and the pH is a measurement unit showing the degree of acidity or alkalinity and may be measured on a scale of 0 to 14. The acidity measurement unit 1100 may be composed of three parts: a pH measurement electrode, a reference electrode, and an input impedance meter, and the pH electrode may be regarded as a kind of battery, and has a voltage that changes according to the pH of the measurement solution, and the pH measurement electrode is It is a glass bulb that is sensitive to hydrogen ions and can have a millivolt (mV) output that varies depending on changes in the relative concentration of hydrogen ions inside and outside the bulb.

The turbidity measuring unit 1200 is for measuring the degree of cloudiness of water, and is an index that quantitatively indicates the degree of cloudyness of water, and indicates resistance to the passage of light. The turbidity measuring unit 1200 uses Nephelometry to measure light scattering by turbid particles in water, and uses a Nephelometry Turbidity Unit (NTU) unit. The turbidity measuring unit 1200 may include a turbidity sensor probe and a turbidity sensor adapter. The turbidity sensor probe emits light and absorbs light for measuring scattering, and the turbidity sensor adapter may mean an assembly of various chipsets mounted on a board such as a PCB.

The dissolved oxygen measuring unit 1300 is for measuring the amount of oxygen dissolved in water, and may include a dissolved oxygen probe, a probe cap, an analog sensor cable, and a dissolved oxygen sensor adapter.

The water temperature measuring unit 1400 may be operated without difficulty even in water or under a harsh environment with a lot of dust, and a measurable temperature may be measured up to 125 degrees Celsius.

According to an embodiment of the present invention, a control unit 1500 for controlling the operation of the system may be included, and the control unit 1500 may control the operation of each of the aforementioned elements (1100, 1200, 1300, 1400, etc.). I can. The control unit 1500 may be implemented as a microcontroller, but may be implemented in a simple form such as an Arduino module.

Referring to FIG. 2, according to an embodiment of the present invention, the housing 100 further includes a ventilation unit 110 for constant temperature and humidity, and the power supply unit 1600 is at least one exposed outside the upper surface of the housing. It may include a solar cell (solar cell) 1610.

A power supply unit 1600 for supplying power to the system is included, and the power supply unit 1600 may be formed of a battery capable of charging wired or wirelessly. In addition, as shown in FIG. 2, elements such as a solar cell 1610 may be included in the power supply unit 1600. The solar cell 1610 may be automatically operated so as to supply power to the system 1000 immediately during normal or if the battery is discharged to a certain level or less. If the IoT system according to an embodiment of the present invention is stably supplied with power through wire and charges the battery, there may be no major problems, but the IoT system in remote areas such as mountains, or on the water surface such as sea or river, where human access is difficult. When it is necessary to operate, it may be difficult to supply power through wire. In this case, if the solar cell 1610 or the like is used, stable power supply is possible.

According to an embodiment of the present invention, a communication unit 1700 for data communication inside or outside the system 1000 may be included. The communication unit 1700 includes a mobile router, and may communicate with other external devices 10 according to at least one of short-range communication and long-distance communication through the communication unit 1700. For long-distance communication, LTE CAT-M1 and NB-IoT shield may be used. For example, an Arduino shield equipped with chips of SIM7000E and SIM7000C may be included in the communication unit 1700 and used. In addition, it is also possible to accurately collect (confirm) location information and the like using a GPS shield. The communication unit 1700 may include a mobile router, for example, an LTE mobile router. The LTE mobile router is a device that converts high-quality LTE signals into Wi-Fi signals, and allows mobile devices, tablets, and laptops to access wireless Internet while on the go. It may be implemented as a USB stick type that can be plugged into a USB port, a wired LTE mobile router that can connect a wired LAN line, a wireless LTE mobile router that can connect to a Wi-Fi device, etc., and may be included in the communication unit 1700. In addition, as shown in FIG. 2, the communication unit 1700 may include an external antenna. The external antenna may be installed to increase the radio wave transmission/reception performance of the wireless LTE router, and the external antenna may be directly mounted on the LTE mobile router, or an antenna may be installed so as to protrude to the outside of the housing 100 using a long extension line. When using an external antenna, you must use an antenna according to the interface standard for connecting the antenna to the LTE mobile router.

In order to judge water quality, it is necessary to measure and secure the values of each item for water temperature, pH, dissolved oxygen (DO), turbidity, biochemical oxygen demand, chemical oxygen demand, electrical conductivity, organic carbon, and total nitrogen content. have. Additional data other than the above items may be collected by the system 1000 through the additional data acquisition unit 1800. The collected data may be provided to other devices 10 or the like through the control unit 1500 and the communication unit 1700. The other device 10 may be a mobile phone, a personal computer (PC), a cloud server, a tablet PC, and the like, but is not limited thereto. In other words, the user can secure water quality data from a remote location using the other device 10, and can evaluate the water quality based on the secured data.

The system 1000 according to an embodiment of the present invention further includes a storage unit 1900 for storing data measured through each of the measurement units 1100, 1200, 1300, and 1400, and the housing 100 further includes at least A plurality of holes 130 for connecting one hook 120 and a bracket may be provided. In the storage unit 1900, water quality information together with location information of a measurement area may be classified by item and stored in the form of a matrix.

Referring to FIG. 2, a plurality of holes 130 for connecting at least one hook 120 and a bracket may be provided in the housing 100. The user may temporarily mount the system 1000 on the waterfront through the hook 120, and an additional bracket or the like may be installed through the hole 130 for such mounting.

In relation to a method of driving a system according to an embodiment of the present invention, the above-described system may be applied. Therefore, with respect to the method, descriptions of the same contents as those of the above-described system have been omitted.

Meanwhile, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable medium. Further, the structure of the data used in the above-described method can be recorded on a computer-readable medium through various means. A recording medium for recording executable computer programs or codes for performing the various methods of the present invention should not be understood as including temporary objects such as carrier waves or signals. The computer-readable medium may include a storage medium such as a magnetic storage medium (eg, ROM, floppy disk, hard disk, etc.), and an optical reading medium (eg, CD-ROM, DVD, etc.).

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

1000: Portable wireless sensor system for IoT-based real-time water quality measurement
1100: acidity (pH) measurement unit
1200: turbidity measuring unit
1300: dissolved oxygen (DO) measuring unit
1400: water temperature measurement unit
1500: control unit
1600: power supply
1700: Ministry of Communications
1800: additional data acquisition unit
1900: storage
100: housing
110: ventilation
120: hook
130: hole
10: other devices

Claims (5)

As a portable wireless sensor system for IoT-based real-time water quality measurement,
An acidity measuring unit for measuring the acidity (pH) of the water to be measured;
A turbidity measuring unit for measuring the turbidity of the water;
A dissolved oxygen measuring unit for measuring dissolved oxygen (DO) of the water;
A water temperature measuring unit for measuring the temperature of the water;
A control unit for controlling the operation of the system;
A power supply for supplying power to the system;
A communication unit for data communication with the inside or outside of the system; And
The acidity measurement unit, the turbidity measurement unit, the dissolved oxygen measurement unit, the water temperature measurement unit, and a control unit, a power supply unit, and a housing accommodating the communication unit,
The acidity measurement unit includes a glass electrode and a comparison electrode,
The dissolved oxygen measuring unit includes a positive electrode, a negative electrode, and a diaphragm disposed between the electrodes,
The water temperature measuring unit includes a metal oxide thermistor whose resistance value varies according to a change in temperature,
The housing is a portable wireless sensor system for IoT-based real-time water quality measurement, characterized in that it can be formed of a material capable of being waterproof, antifouling, and floating on water.
The method of claim 1,
The housing further includes a ventilation unit for constant temperature and humidity,
The power supply unit includes at least one solar cell exposed to the outside of the upper surface of the housing. A portable wireless sensor system for measuring water quality based on IoT in real time.
The method of claim 1,
The acidity measurement unit, turbidity measurement unit, dissolved oxygen measurement unit, and water temperature measurement unit are inserted into the water to perform respective measurements,
The acidity measurement unit measures acidity based on a potential difference generated between the glass electrode and the comparison electrode by the water,
The turbidity measurement unit collects the amount of light in the water after shooting light into the water, and measures the turbidity based on the collected light amount,
The dissolved oxygen measuring unit measures the amount of dissolved oxygen (DO) based on a change in current value generated as oxidation and reduction reactions occur at each electrode by water passing through the diaphragm,
The water temperature measuring unit is a portable wireless sensor system for IoT-based real-time water quality measurement, characterized in that the water temperature is measured based on a change in an output value through the thermistor.
The method of claim 1,
A storage unit for storing data measured through each measurement unit is further included,
A portable wireless sensor system for IoT-based real-time water quality measurement, characterized in that the housing is provided with at least one hook and a plurality of holes for connecting the bracket.
The method of claim 1,
The communication unit includes a mobile router,
A portable wireless sensor system for IoT-based real-time water quality measurement, characterized in that communication with other external devices is possible according to at least one of short-range communication and long-distance communication through the communication unit.

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