Voltage sensor Bluetooth experiment teaching aid

Abstract

The utility model discloses a Bluetooth experiment teaching aid for a voltage sensor. The Bluetooth experiment teaching aid comprises a voltage sensing unit and an intelligent terminal. The voltage sensing unit is composed of a shell, and an A / D acquisition module, a main control module, a display module, a power supply module and a printed circuit board which are arranged in the shell; the A / D acquisition module, the main control module, the display module and the power supply module are installed on the printed circuit board and are connected with each other in a wired mode. And the main control module of the voltage sensing unit is wirelessly connected with the intelligent terminal through Bluetooth. According to the utility model, the voltage sensing unit is separated from the intelligent terminal, first-order voltage measurement and simple numerical value display functions are realized through the voltage sensing unit, and high-order visual display of experimental data is realized through the intelligent terminal, so that on the premise that the measurement precision is ensured, the measurement efficiency is improved. Automatic display and recording of voltage data are realized, and the portability and the manufacturing cost of the experiment teaching aid are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental teaching aids, in particular to a voltage sensor Bluetooth experimental teaching aid. Background Art

[0002] Experimental teaching is a vital part of middle school physics teaching, and it is also an important way to cultivate students' core literacy in physics. However, in actual teaching, affected by many factors such as venues, instruments, and environment, experimental teaching is difficult to play its due role. For example, the current middle school physics experimental teaching generally uses traditional mechanical voltmeters to complete voltage measurement, and mechanical voltmeters have the disadvantages of not being able to intuitively display voltage values, requiring manual readings, and not being able to automatically record measurement data. For this reason, it is necessary to design a voltage measurement experimental teaching aid to replace the mechanical voltmeter in the current middle school physics experimental teaching, to provide more accurate data for experimental teaching, to display richer data results, and to obtain better experimental results at a lower cost. Utility Model Content

[0003] The utility model aims to solve the problem that the voltmeter used in the physics experiment teaching in middle schools cannot directly display the voltage value and needs manual reading and cannot automatically record the measured data, and provides a voltage sensor Bluetooth experiment teaching aid.

[0004] To solve the above problems, the utility model is implemented through the following technical solutions:

[0005] A voltage sensor Bluetooth experimental teaching aid, including a voltage sensing unit and an intelligent terminal. The voltage sensing unit consists of a shell and an A / D acquisition module, a main control module, a display module, a power supply module and a printed circuit board arranged in the shell. The A / D acquisition module, the main control module, the display module and the power supply module are installed on the printed circuit board and are connected to each other by wire, that is: the power supply module includes a lithium battery, a charge and discharge module and a toggle switch, wherein the lithium battery is connected to the charge and discharge module through the wiring on the printed circuit board, and the charge and discharge module is connected to the power supply end of the main control module through the toggle switch through the wiring on the printed circuit board; the A / D acquisition module includes 4 analog input ports and an analog-to-digital converter, wherein the 4 analog input ports are connected to the analog-to-digital converter through the wiring on the printed circuit board; the power supply end of the main control module is connected to the analog-to-digital converter and the power supply end of the display module through the wiring on the printed circuit board; the main control module is connected to the power supply end of the display module through the wiring on the printed circuit board; the power supply end of the main control module is connected to the analog-to-digital converter and the power supply end of the display module through the wiring on the printed circuit board; the main control module is connected to the power supply end of the display module through the wiring on the printed circuit board; the power supply end of the display ... 2 The C serial port is connected to the analog-to-digital converter through wiring on the printed circuit board; the main control module is directly connected to the display module through wiring on the printed circuit board. The main control module of the voltage sensor unit is wirelessly connected to the intelligent terminal through Bluetooth communication.

[0006] In the above solution, the main control module is the ESP-WROOM-32E development board.

[0007] In the above solution, the four analog input ports are banana plugs.

[0008] In the above scheme, the analog-to-digital converter is an analog-to-digital converter of model ADS1015 and ADS1115.

[0009] In the above solution, the display module is an OLED display screen.

[0010] In the above solution, the intelligent terminal is a smart phone or a tablet computer.

[0011] Compared with the prior art, the A / D acquisition module, main control module, display module and power supply module of the utility model are installed on a printed circuit board and connected to each other by wire. The Bluetooth communication terminal of the main control module is wirelessly connected to the intelligent terminal. The utility model adopts the form of separating the voltage sensing unit from the intelligent terminal. The primary voltage measurement and simple numerical display functions are realized by the voltage sensing unit, and the visualization display of high-level experimental data is realized by the intelligent terminal. In this way, the automatic display and recording of voltage data can be realized while ensuring the measurement accuracy, and the portability and production cost of the experimental teaching aids can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a principle block diagram of the utility model.

[0013] Figure 2 This is a physical diagram of the present utility model.

[0014] Figure 3 The utility model is a display image of a host computer for measuring the voltage at both ends of a dry cell. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clearly understood, the utility model is further described in detail below in combination with specific examples and with reference to the accompanying drawings.

[0016] A voltage sensor Bluetooth experiment teaching aid, such as Figure 1 As shown, it includes a voltage sensing unit and an intelligent terminal. The voltage sensing unit is composed of a housing and an A / D acquisition module, a main control module, a display module, a power supply module and a printed circuit board arranged in the housing; the A / D acquisition module, the main control module, the display module and the power supply module are installed on the printed circuit board and are connected to each other by wire. The main control module of the voltage sensing unit is wirelessly connected to the intelligent terminal via Bluetooth communication.

[0017] The power supply module includes a lithium battery, a charge and discharge module and a toggle switch. The lithium battery is connected to the charge and discharge module through the wiring on the printed circuit board, and the output end of the charge and discharge module is connected to the power supply end of the main control module through the wiring on the printed circuit board via the toggle switch. In a preferred embodiment of the utility model, the lithium battery adopts a 18650 lithium battery, and its output voltage is 3.8V. Since the output voltage of the 18650 lithium battery is 3.8V and the operating voltage of the main control module is 5V, it is necessary to use a 5V charge and discharge module to boost the output voltage of the lithium battery to 5V, so as to output a 5V stable operating voltage to the main control module. In addition, the 5V charge and discharge module will also contain a Type-C interface, and an external power bank can also be used to charge the 18650 lithium battery or power the main control module. The function of the toggle switch is to control the power supply module to supply power to the main control module.

[0018] The main control module is the ESP-WROOM-32E development board. The power supply terminal of the main control module is connected to the power supply terminals of the analog-to-digital converter and the display module through wiring on the printed circuit board.

[0019] The A / D acquisition module consists of 4 analog input ports and an analog-to-digital converter. The 4 analog input ports are connected to the analog-to-digital converter through wiring on the printed circuit board. 2 The C serial port is connected to the main control module through the wiring on the printed circuit board. The four analog input ports are used as the access ports of the components to be tested. 2mm banana plugs are placed in appropriate positions on the printed circuit board. These four analog input ports are respectively represented as AIN0, AIN1, AIN2 and AIN3, which can be configured as 4 single-ended inputs or 2 differential inputs. Since the preferred embodiment of the utility model requires measuring the voltage in parallel with the two ends of the component to be tested, the four analog input ports are configured as differential inputs. The analog-to-digital converter realizes the conversion of the electromotive force from analog quantity to digital quantity, and its model is ADS1015 and ADS1115. In this embodiment, the analog-to-digital converter uses the analog-to-digital converter model ADS1015. The analog-to-digital converter adopts I 2 The C serial port is connected to the main control module to realize data transmission and control management between the A / D acquisition module and the main control module. In this way, the A / D acquisition module collects the electromotive force of the component to be measured through the analog input port, and sends it to the main control module after analog-to-digital conversion by the analog-to-digital converter to complete the calculation of the voltage data.

[0020] The display module is an OLED display screen. The OLED display screen is connected to the main control module through wiring on a printed circuit board, and the OLED display screen can display the measured voltage data in real time.

[0021] The circuit connections of the acquisition module, main control module, display module and power supply module are integrated and installed on the printed circuit board using the silk screen printing process, which reduces the complicated connection operation and avoids the data measurement failure caused by connection error and connection loss. Figure 2 shown.

[0022] The Bluetooth communication module of the smart terminal establishes a connection with the Bluetooth communication module of the main control module to realize the Bluetooth wireless connection between the smart terminal and the voltage sensing unit. The smart terminal is a smart phone or a tablet computer. The smart terminal can display the received voltage data in real time and simultaneously depict the image of the data changing over time. In addition, the experimenter can use a computer to edit the display page of the smart terminal through the Internet, and can also send the data received by the smart terminal to the computer through the Internet for diversified data processing and error analysis.

[0023] Before sending a signal to the A / D acquisition module each time, the main control module will record the signal sending time and 2 After the C serial port receives the data collected by the A / D acquisition module, the main control module calculates and processes the collected data, converts it into the voltage data format of standard units, and returns the results to the display module and the intelligent terminal to complete the display, recording and visualization of the physical experiment data. Figure 3 This experimental teaching aid can collect and form images of voltage changes over time during the experiment, providing more accurate data and richer data observation for middle school physics electrical experiments.

[0024] It should be noted that although the embodiments described above are illustrative, they are not limitations of the present invention, and therefore the present invention is not limited to the above specific embodiments. Without departing from the principles of the present invention, any other embodiments obtained by those skilled in the art under the inspiration of the present invention are deemed to be within the protection of the present invention.

Claims

1. A voltage sensor Bluetooth experimental teaching aid, characterized in that: It includes a voltage sensing unit and an intelligent terminal; The voltage sensing unit is composed of a shell and an A / D acquisition module, a main control module, a display module, a power supply module and a printed circuit board arranged in the shell; the A / D acquisition module, the main control module, the display module and the power supply module are installed on the printed circuit board and are connected to each other by wire, that is, the power supply module includes a lithium battery, a charge and discharge module and a toggle switch, wherein the lithium battery is connected to the charge and discharge module through wiring on the printed circuit board, and the charge and discharge module is connected to the power supply end of the main control module through the toggle switch through the wiring on the printed circuit board; the A / D acquisition module includes 4 analog input ports and an analog-to-digital converter, wherein the 4 analog input ports are connected to the analog-to-digital converter through wiring on the printed circuit board; the power supply end of the main control module is connected to the analog-to-digital converter and the power supply end of the display module through wiring on the printed circuit board; the main control module is connected to the analog-to-digital converter through I 2 The C serial port is connected to the analog-to-digital converter through wiring on the printed circuit board; the main control module is directly connected to the display module through wiring on the printed circuit board; The main control module of the voltage sensor unit is wirelessly connected to the intelligent terminal via Bluetooth communication.

2. A voltage sensor Bluetooth experiment teaching aid according to claim 1, characterized in that: The main control module is the ESP-WROOM-32E development board.

3. A voltage sensor Bluetooth experiment teaching aid according to claim 1, characterized in that: The 4 analog input ports are banana plugs.

4. A voltage sensor Bluetooth experiment teaching aid according to claim 1, characterized in that: The analog-to-digital converters are ADS1015 and ADS1115.

5. A voltage sensor Bluetooth experiment teaching aid according to claim 1, characterized in that: The display module is an OLED display.

6. A voltage sensor Bluetooth experiment teaching aid according to claim 1, characterized in that: The intelligent terminal is a smart phone or a tablet computer.

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