KR20170046353A - Science experiment system using arduino - Google Patents

Abstract

The present invention relates to a science experimental system using Arduino, comprising: a differential potential measurement circuit for measuring an output voltage value of a sensor; and an Arduino board including a micro controller, and providing the output voltage value of the sensor, received from the differential potential measurement circuit by control of the micro controller, to a smart terminal through a WiFi module. Therefore, it is possible to conduct experiments of various sensors through the Arduino board, and to display and store various data of sensors, represented by graphs and statistical values with the smart terminal through WiFi communication.

Description

SCIENCE EXPERIMENT SYSTEM USING ARDUINO}

An embodiment of the present invention relates to a scientific experiment system using Arduino.

Arduino board is developed for the purpose of easy electronic device development without any special knowledge of hardware such as electronics or circuit. It is easy to know how to use and programming method easily. have.

The Arduino board can accept values from a number of switches and sensors, control electrical devices such as LEDs and motors to provide interactions with the surrounding environment, and can easily operate the microcontroller.

In general, AVU programming can be compiled with WinAVR and uploaded via ISP device. However, it is easy to compile and upload via USB.

In addition, Arduino board is comparatively cheap compared with other modules, and supports OS such as Windows (Windows), Mac OSX and Linux, and the circuit diagram of Arduino board is released according to CCL. Can be modified.

However, in the practice using the conventional Arduino board, since each communication method is manufactured as an independent device, it is difficult to organically link each exercise device, so that after learning and practicing separately using the app of the smartphone, Since the hardware device needs to be controlled separately, the efficiency of the practice becomes poor and it is difficult to obtain more detailed result data.

In addition, according to the conventional technology, it is difficult to comprehend and compare the characteristics of each experiment because of difficulty in comprehensive practice. Therefore, the practitioners are frequently retrained through the equipment learned in the educational institution and other equipment , There was a problem that the controller had to be linked with the app of the smartphone by producing the controller separately.

Related Prior Art Korean Patent Laid-Open Publication No. 10-20140033297 entitled Smart Robot Education Service Platform System, published on Mar. 18, 2014.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to enable various kinds of sensors to be tested through an Arduino board and to transmit various data of sensors to a smart terminal through WiFi communication, Display, and storage of information, so that the practitioner can perform a more convenient and comprehensive experiment.

In order to solve the above-mentioned problems, the scientific experiment system using the Arduino according to the present embodiment includes a differential potential measurement circuit for measuring an output voltage value of a sensor; And an arduino board including a micro controller and providing the output voltage value of the sensor received from the differential potential measurement circuit under the control of the micro controller to a smart terminal through a WiFi module; .

According to another embodiment of the present invention, the electrode board includes a battery for applying a positive voltage; And a voltage conversion unit converting the positive voltage and the negative voltage using a positive voltage applied from the battery and providing the converted voltage to the sensor.

According to another embodiment of the present invention, the differential potential measuring circuit converts the positive (+) and negative (-) voltage values obtained from the sensor into positive voltage values and provides the voltage values to the ADC can do.

According to another embodiment of the present invention, the differential potential measuring circuit includes: a first operational amplifier (OP Amp) for reducing a voltage value obtained from the sensor by half; And a second operational amplifier (OP Amp) for adding a predetermined voltage value to the voltage value reduced to 1/2.

According to another embodiment of the present invention, the sensor is a voltage sensor, a temperature sensor, a vibration sensor, a current sensor, a humidity sensor or a pressure sensor, and the smart terminal can display the measured information in a graph and a statistic.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to make it possible to test various sensors through an Arduino board and to provide a smart terminal with WiFi communication, By displaying and storing various data in graphs and statistical values, it is possible to conduct experiment more convenient and comprehensive experiment.

1 is a conceptual diagram of a scientific experiment system using an Arduino according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an external appearance of a scientific experiment system using an Arduino according to an embodiment of the present invention. Referring to FIG.
3 and 4 are views for explaining a differential potential measuring circuit according to an embodiment of the present invention.
5 is a graph showing voltage values of a sensor which is measured and converted and output in the differential potential measuring circuit according to an embodiment of the present invention.
6 and 9 are views for explaining a method of communicating with a smart terminal and a sensor connection method of a scientific experiment system using an Arduino according to an embodiment of the present invention.
10 and 11 are views for explaining a method of measuring data of a sensor through a smart terminal according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention. In addition, the size of each component in the drawings may be exaggerated for the sake of explanation and does not mean a size actually applied.

FIG. 1 is a conceptual diagram of a scientific experiment system using an Arduino according to an embodiment of the present invention, and FIG. 2 is an external view illustrating a configuration of a scientific experiment system using Arduino according to an embodiment of the present invention FIG.

Hereinafter, a scientific experiment system using an Arduino according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

1 and 2, the scientific experiment system using the Arduino according to an embodiment of the present invention includes an Arduino board 110 and a differential potential measurement circuit 120.

The Arduino board (110) is an open source electronics kit.

More specifically, the Arduino board (110) is a substrate developed for the purpose of easily developing an electromechanical device even without expert knowledge of hardware such as an electronic engineering or a circuit. Knowing how to program can be handled easily.

The Arduino board 110 according to an exemplary embodiment of the present invention includes a micro controller and can measure various parts such as the sensor 121 by connecting them. The output voltage value of the sensor 121 received from the differential potential measuring circuit 120 can be provided to the smart terminal through the WiFi module 130. [

When the adonyno board 110 acquires data from the sensor 121, the potential difference measured by the sensor 121 is used. A method of measuring the potential difference of the electrode board 110 according to an embodiment of the present invention may be a ground reference method or a ground reference method. have.

At this time, the ground is stable and unchanged, and it is mostly within 0 V. In the ground reference method, one point refers to the ground and the other point measures the potential difference of the point to be measured. On the other hand, the differential potential measurement method can measure a potential difference between two different points of a circuit or a sensor to be measured.

Most of the sensors used in connection with electronic devices can obtain data using both the ground reference method and the differential potential measurement method.

However, there are some sensors that can obtain data using only the differential potential measurement method. Such a sensor is a thermocouple sensor. A thermocouple type sensor is a sensor that measures temperature through a potential difference between two different points. However, all the sensors that can be measured by the ground reference method can be measured by the differential potential measurement method. In order to measure the differential potential difference on the arudine board 110, a separate circuit configuration for differential potential measurement is required.

Sensors can be represented by converting data to a potential difference, and such sensors require sensors that do not require power or require power. Accordingly, the electrode board 110 according to an exemplary embodiment of the present invention can perform two functions, that is, a power supply function and a differential potential measurement function, for a sensor that requires power.

As shown in FIG. 1, in order to measure the sensor 121, a current should be applied to the sensor 121. For example, in order to measure the potential difference of the WCS 1702, which is the current sensor 121, And for this purpose, the adonynode 110 may be configured to supply a positive voltage (for example, +5 V).

More specifically, as shown in FIG. 2, the adonynode 110 includes a battery 115 for applying a positive voltage, and the battery 115 receives a voltage (+) Voltage and a negative (-) voltage using the positive (+) voltage and provide it to the sensor 121.

The differential potential measurement circuit 120 may convert the positive and negative voltage values obtained from the sensor into positive voltage values and provide the voltage values to the ADC.

For example, the differential potential measuring circuit 120 receives the output voltage value data of the sensor 121 according to the application of the voltage of the ADC 110 and outputs the differential voltage to the analog port of the ADC 120 For example Analog 0 port).

Therefore, the arithmetic board 110 can measure the differential potential difference through the differential potential measurement circuit 120.

In this way, the potential difference (voltage) of the sensor 121 measured on the aruna on board 110 can be provided to the smart terminal.

At this time, a short-range wireless communication method such as Bluetooth, WiFi, NFC, RFID, USB, or UART may be used as a method of transmitting data by connecting the smartphone with the smartphone 100 according to an embodiment of the present invention. A wireless communication method using WiFi can be used.

Wireless communication using WiFi can transmit data to devices using different operating systems using TCP / IP or UDP protocol. A separate WiFi module 130 is required to transmit the data collected by the Arduino board 110 to the smart terminal using a WiFi communication method. In addition, in order to transmit data to a smart terminal using a WiFi communication method, a wireless LAN environment must be established.

IEEE 802.11 is a technology used in computer wireless networks for wireless local area networks (WLANs), often referred to as wireless LANs, and is the standard technology developed in the 11th Working Group of the IEEE's LAN / MAN Standards Committee. Here, two structures are defined, namely an infrastructure mode and an ad-hoc mode.

The difference between the above two methods is the existence of a connection point to the external Internet network, and it is impossible to connect to the Android WiFi communication module in the network constructed in the ad-hoc mode. Therefore, in order to use the WiFi module 130, the adonyno board 110 of the present invention establishes a wireless network in an infrastructure mode and establishes a wireless network in a 1: 1 ratio between the WiFi module 130 and the smart terminal It should be designed by communication.

At this time, a WiFi module that is used as an ad-hoc mode as a WiFi module 130, but supports a software infrastructure mode, which is a method of cheating in an infrastructure mode on an Android platform, can be used.

Various data measured at the Arduino board 110 can be provided to the smart terminal through the WiFi module 130. The smart terminal can thus display various data of the sensor as graphs and statistics Can be displayed and stored.

3 and 4 are views for explaining a differential potential measuring circuit according to an embodiment of the present invention.

FIG. 3 shows an operational amplifier (OP Amp) included in the differential potential measuring circuit according to an embodiment of the present invention, and FIG. 4 shows a circuit diagram of a differential potential measuring circuit according to an embodiment of the present invention .

The operational amplifier (OP Amp) operates as a differential amplifier when a low voltage is simultaneously applied to the inverting input terminal (-) and the non-inverting input terminal (+).

In FIG. 3, when the resistances of R1, R2, R3, and R4 are all the same, the output voltage becomes V0 = V2 - V1.

In the embodiment of FIG. 4, the measurable voltage is -5 V to +5 V, and the voltage can be measured by connecting the positive (+) terminal of the circuit to be measured to R2 and connecting the negative terminal to R3 .

The input data is amplified by two operational amplifiers (OP Amp) 410 and 420, and power is required to amplify the input data by using an operational amplifier (OP Amp). Therefore, according to an embodiment of the present invention, the power supply may include a battery 115 that applies a positive voltage to the electrode board 110.

The voltage of the ADC board 110 is 0 V to 5 V, and a negative voltage can not be read. Therefore, the negative voltage can be measured using the differential potential measuring circuit of Fig.

5 is a graph showing voltage values of a sensor measured and converted and output in the differential potential measuring circuit according to an embodiment of the present invention.

In the graph of FIG. 5, the X-axis represents the displacement value of the voltage applied to the circuit to be measured from -5 V to 5 V, the Y-axis represents the voltage value read from the Arduino when the voltage of the circuit to be measured is changed, .

5, the differential potential measurement circuit 120 converts the positive or negative voltage value 610 obtained from the sensor into a positive voltage value 620, It can be provided as an InnoBoard.

More specifically, the differential potential measuring circuit includes a first operational amplifier (OP Amp) 410 for reducing the voltage value obtained from the sensor to 1/2, and a second operational amplifier And a second operational amplifier (OP Amp) 420.

For example, the differential potential measurement circuit 120 calibrates to 0 V if the voltage measured at the sensor is-5 V and compensates to 2.5 V if the voltage measured at the sensor is 0 V to provide to the aruna board 110 do.

Accordingly, the ADC board 110 can also measure the voltage of the sensor 121 that outputs a negative voltage value through the differential potential measurement circuit 120. [

6 and 9 are views for explaining a method of communicating with a smart terminal and a sensor connection method of a scientific experiment system using an Arduino according to an embodiment of the present invention.

6, the scientific experiment system using Arduino according to an embodiment of the present invention includes a voltage sensor 122, a current sensor 123, a temperature sensor 124, a humidity sensor 125, a vibration sensor 126, or the pressure sensor 127, for example.

More specifically, the scientific experiment system measures the data of the sensors 122, 123, 124, 125, 126, and 127 through the Arduino board 110 and the differential potential measurement circuit 120 FIG. 7 is a schematic view and a schematic view of a voltage sensor, FIG. 8 is a schematic view and appearance of a current sensor, and FIG. 9 is a schematic view and a view of a temperature sensor.

10 and 11 are views for explaining a method of measuring data of a sensor through a smart terminal according to an embodiment of the present invention.

Hereinafter, a method of measuring the data of the sensor through the smart terminal of the scientific experiment system using the Arduino according to an embodiment of the present invention will be described with reference to FIGS. 6, 10 and 11. FIG.

6, the user can communicate between the smart terminal 200 and the redirection board 110. More specifically, according to an embodiment of the present invention, the smart terminal 200 can communicate with a WiFi module 130 to communicate with the < / RTI >

The smart terminal 200 may connect the WiFi setting button 1010 to the blackboard 110.

More specifically, as shown in FIG. 10, the WiFi setting button 1010 is executed to access an access point (AP) generated through a WiFi module 130 of the adonyno board 110 , A start button 1020 is executed to execute a start application and a user sensor button 1030 is executed to select a sensor to be measured in the corresponding channel. In addition, the send button 1040 can be executed to send experiment data in the form of an excel file via mail through the mail sending function.

As shown in FIG. 11, the smart terminal can display the measurement information of the sensor as graphs and statistics.

As shown in FIG. 11, the user can compare measurement data of a plurality of sensors through the smart terminal 200 through graphs, and receive statistical information such as a minimum value, a maximum value, an average value, and a slope of the measured data .

According to an embodiment of the present invention, rather than updating the graph and the statistics at the time of receiving new data from the smartphone 200, the smartphone 200 may be updated at predetermined intervals such as one second, And can be configured to provide accurate data.

As described above, according to the embodiment of the present invention, it is possible to test various sensors through an Arduino board using a smart terminal, and various data of the sensor can be displayed on the smart terminal through WiFi communication, So that the practitioner can perform a more convenient and comprehensive experiment.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical spirit of the present invention should not be limited to the above-described embodiments of the present invention, but should be determined by the claims and equivalents thereof.

110: Arduino board
115: Battery
120: Differential potential measurement circuit
121: sensor
130: WiFi Module
410: first operational amplifier (OP Amp)
420: second operational amplifier (OP Amp)

Claims (5)

A differential potential measuring circuit for measuring an output voltage value of the sensor; And
An Arduino board including a micro controller and providing the output voltage value of the sensor received from the differential potential measurement circuit under the control of the micro controller to a smart terminal via a WiFi module;
Scientific Experimental System Using Arduino. The method according to claim 1,
The above-
A battery for applying a positive voltage; And
A voltage converting unit for converting the positive (+) voltage and negative (-) voltage supplied from the battery to provide the voltage to the sensor;
, Which is a scientific experiment system using Arduino. The method according to claim 1,
Wherein the differential potential measuring circuit comprises:
And converting the positive (+) and negative (-) voltage values acquired from the sensor into positive (+) voltage values and providing the analog voltage values to the ADC. The method of claim 3,
Wherein the differential potential measuring circuit comprises:
A first operational amplifier (OP Amp) for reducing the voltage value obtained from the sensor by 1/2; And
A second operational amplifier (OP Amp) for adding a preset voltage value to the voltage value reduced to 1/2;
Scientific Experimental System Using Arduino. The method according to claim 1,
The sensor includes:
A voltage sensor, a temperature sensor, a vibration sensor, a current sensor, a humidity sensor or a pressure sensor,
The smart terminal includes:
A scientific experiment system using Arduino, which displays the measured information as graphs and statistics.

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