CN221079210U - Physical experiment control circuit - Google Patents
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- CN221079210U CN221079210U CN202322950614.3U CN202322950614U CN221079210U CN 221079210 U CN221079210 U CN 221079210U CN 202322950614 U CN202322950614 U CN 202322950614U CN 221079210 U CN221079210 U CN 221079210U
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- 238000002474 experimental method Methods 0.000 title claims abstract description 98
- 238000012360 testing method Methods 0.000 claims abstract description 167
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 42
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 20
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Abstract
The utility model discloses a physical experiment control circuit, which comprises: the test circuits are arranged in a one-to-one matching way with the test devices for physical experiments and are used for triggering the test devices or acquiring experimental data of the test devices; the main control unit is connected with all the test circuits and provided with a plurality of digital-to-analog conversion interfaces for converting the experimental data into digital signals; and the power supply circuit is connected with an external power supply and is used for converting the output voltage of the external power supply into the working voltage of the physical experiment control circuit. Compared with the prior art, the utility model can be compatible and realize various physical experiments at the same time, can be arranged in a physical experiment box, can be independently assembled on a testing device, is convenient for a user to perform experiment operation, and saves manual operation time.
Description
Technical Field
The utility model relates to a physical experiment box, in particular to a physical experiment control circuit.
Background
During the course, various physical experiments are often required to better understand the physical concepts and principles by students, but a special laboratory table is configured for each student, which greatly increases the experimental cost.
The current design scheme is that through setting up the physical experiment case, at its internal integration corresponding control circuit, the student uses corresponding testing arrangement, can show corresponding experimental data, and whole easy operation also need not to additionally build the laboratory bench again, greatly reduced the experiment cost.
However, in the above scheme, one physical experiment box can only be compatible with one experiment requirement, and during the course, students often need to perform multiple physical experiments, so the current design scheme of the physical experiment box cannot well adapt to the experiment requirement of the students. In addition, the scheme is limited to be operated in the physical experiment box, and when partial physical experiments are carried out, the experiment effect of students can be influenced due to the limitation of the physical experiment box.
Disclosure of utility model
Aiming at the problems that the prior physical experiment box can only be compatible with one physical experiment and cannot well adapt to the needs of multiple physical experiments of students in the prior art, the utility model provides a physical experiment control circuit.
The technical scheme of the utility model is that a physical experiment control circuit is provided, which comprises:
The test circuits are arranged in a one-to-one matching way with the test devices for physical experiments and are used for triggering the test devices or acquiring experimental data of the test devices;
The main control unit is connected with all the test circuits and provided with a plurality of digital-to-analog conversion interfaces for converting the experimental data into digital signals;
The power supply circuit is connected with an external power supply and is used for converting the output voltage of the external power supply into the working voltage of the physical experiment control circuit;
The physical experiment control circuit can be assembled in the testing device or integrated in the physical experiment box, and when integrated in the physical experiment box, the physical experiment control circuit further comprises a display unit, wherein the display unit is used for displaying the experiment data.
Further, the test device includes: voltage detection means, current detection means, and temperature detection means;
The test circuit comprises a first test circuit connected with the voltage detection device, a second test circuit connected with the current detection device and a third test circuit connected with the temperature detection device;
The first test circuit is provided with at least one voltage interface connected with the voltage detection device, a conversion resistor for converting a voltage signal into a current signal, and a first current sensor for acquiring the current signal and transmitting the current signal to the main control unit;
The second test circuit is provided with at least one current interface connected with the current detection device and a second current sensor used for acquiring a current signal and transmitting the current signal to the main control unit;
The third test circuit is provided with at least one temperature interface connected with the temperature detection device, a thermistor arranged at the temperature interface and a third current sensor connected with the thermistor, and the third current sensor can output different current signals according to the resistance value of the thermistor.
Further, the first test circuit includes: resistor R3, resistor R11, resistor R13, resistor R14, capacitor C11, and voltage chip U2;
the first pin of the voltage chip U2 is connected with the resistor R14 in series and then is connected with the main control unit, the second pin is grounded, the third pin is connected with the resistor R13 in series and then is used as a first input end of the first test circuit to be connected with the voltage detection device, the fourth pin is connected with the resistor R11 in series and then is used as a second input end of the first test circuit to be connected with the voltage detection device, the fifth pin is grounded, and the sixth pin is connected with a 3.3V power supply;
One end of the resistor R3 is connected between the resistor R13 and the third pin, the other end of the resistor R11 is connected between the resistor R11 and the fourth pin, and one end of the capacitor C11 is connected between a 3.3V power supply and the sixth pin, and the other end of the capacitor C11 is grounded.
Further, the test device further includes: student power supply, laser and light screen;
The test circuit further comprises a fourth test circuit connected with the student power supply, a fifth test circuit connected with the laser, and a sixth test circuit connected with the screener;
The fourth test circuit, the fifth test circuit and the sixth test circuit all comprise a test interface connected with the test device and a control interface connected with the main control unit.
Further, the fourth test circuit includes: transistor Q2, resistor R15, diode D4;
the base electrode of the triode Q2 is connected in series with the resistor R15 and then is used as a control interface of the fourth test circuit to be connected to the main control unit, the collector electrode is grounded, the emitter electrode is connected to the cathode electrode of the diode D4, and the anode electrode of the diode D4 is used as a test interface of the fourth test circuit to be connected to the test device.
Further, the testing device also comprises a dynamometer and a balance;
The test circuit further comprises a seventh test circuit connected with the dynamometer and an eighth test circuit connected with the balance, and the seventh test circuit and the eighth test circuit are used for transmitting experimental data of the dynamometer and the balance to the main control unit.
Further, the power supply circuit includes: a voltage conversion chip U3, a capacitor C14 and a capacitor C15;
The first pin, the second pin and the fourth pin of the voltage conversion chip U3 are used for outputting working voltage for the main control unit to work, and the third pin is connected to an external power supply;
the capacitor C14 is connected between the first pin and the second pin, and one end of the capacitor C15 is connected between the third pin and an external power supply, and the other end of the capacitor C is grounded.
Further, the physical experiment control circuit further comprises a communication circuit for externally connecting the display unit, and the communication circuit comprises a communication chip UN, a diode D2 and a triode Q3;
The first pin of the communication chip UN is connected to the positive electrode of the diode D2, the second pin is used as a first output end of the communication circuit to be externally connected with the display unit, and the third pin is used as a second output end of the communication circuit to be externally connected with the display unit, the fourth pin, the fifth pin and the sixth pin to be grounded;
The cathode of the diode D2 is used as a detection pin to output VBUS voltage, the base electrode of the triode Q3 is connected to the main control unit, the collector electrode is grounded, and the emitter electrode is connected to the third pin.
Compared with the prior art, the utility model has at least the following beneficial effects:
1. According to the utility model, the plurality of test circuits are designed to be matched with various test devices for physical experiments and are connected to the main control unit at the same time, and the main control unit is used for controlling the main control unit to start or receive experimental data, so that the utility model can be compatible with various physical experiments at the same time and meets the physical experiment requirements of students;
2. The physical experiment control circuit provided by the utility model can be directly arranged on a circuit board in a physical experiment box to realize the aim of being compatible with various physical experiments, and can also be directly arranged in a testing device, so that the physical experiment control circuit can meet the experiment requirements of the testing devices, and can be separated from the physical experiment box, thereby being convenient for students to operate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of the overall system of the present utility model;
FIGS. 2 and 3 are circuit topologies of a first test circuit and a second test circuit according to the present utility model, respectively;
fig. 4, 5 and 6 are circuit topologies of a fourth test circuit, a fifth test circuit and a sixth test circuit according to the present utility model, respectively;
FIG. 7 is a schematic diagram of a power circuit topology according to a first embodiment of the present utility model;
FIG. 8 is a schematic diagram of a power circuit according to a second embodiment of the present utility model;
FIG. 9 is a schematic diagram of a communication circuit according to the present utility model;
fig. 10 is a schematic topology diagram of a master control unit according to a first embodiment of the present utility model;
fig. 11 is a schematic topology diagram of a master control unit according to a second embodiment of the present utility model.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the utility model, not to imply that each embodiment of the utility model must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The principles and structures of the present utility model are described in detail below with reference to the drawings and the examples.
At present, most of student experiments are based on physical experiment boxes, but the physical experiment boxes can only be used for one physical experiment, and cannot well meet the experiment requirements of students. The utility model has the idea that a plurality of test circuits are designed and can be matched with the test device, so that the aim of being compatible with various physical experiments is fulfilled, and meanwhile, the physical experiment control circuit provided by the utility model can be further designed in the test device, so that the limitation of a physical experiment box is further removed, and the physical experiment control circuit is convenient for students to carry out physical experiments.
Specifically, the physical experiment control circuit provided by the utility model comprises the following parts:
The test circuits are arranged in a one-to-one matching way with the test devices for physical experiments and are used for triggering the test devices or acquiring experimental data of the test devices;
The main control unit is connected with all the test circuits and provided with a plurality of digital-to-analog conversion interfaces for converting experimental data into digital signals;
The power supply circuit is connected with an external power supply and is used for converting the output voltage of the external power supply into the working voltage of the physical experiment control circuit;
the physical experiment control circuit can be assembled in the testing device or integrated in the physical experiment box, and when the physical experiment control circuit is integrated in the physical experiment box, the physical experiment control circuit further comprises a display unit, and the display unit is used for displaying experimental data.
The test device may include various test meters, such as voltmeters and ammeter, and since the test device can independently complete physical experiments, the test circuit is connected to the test device to obtain experimental data, and for another type of test device, a switch trigger is required to perform a switching action, such as a relay and a laser, and the test circuit is connected to the test device to trigger the test device, so that the test device is triggered when in use;
When the physical experiment control circuit designed by the utility model is integrated in the physical experiment box, the plurality of test circuits designed by the utility model can simultaneously meet the requirements of various physical experiments, and when the physical experiment control circuit designed by the utility model is integrated in the test device, the plurality of test circuits can meet various test devices, so that the physical experiment control circuit can also be compatible with the use of various test devices.
As shown in fig. 1, the "MCU" is the above-mentioned main control unit, the "power supply module" is the above-mentioned "power supply circuit", "current sensor 1", "current sensor 2", "current sensor 3", "dynamometer interface", "balance interface", "student power relay", "laser head control", "light screen control", and the like are connected to the corresponding test device, respectively, so as to meet specific physical experiment requirements.
Specifically, the testing device provided by the utility model comprises: voltage detection means, current detection means, and temperature detection means;
The test circuit comprises a first test circuit connected with the voltage detection device, a second test circuit connected with the current detection device and a third test circuit connected with the temperature detection device;
The first test circuit is provided with at least one voltage interface connected with the voltage detection device, a conversion resistor for converting a voltage signal into a current signal, and a first current sensor for acquiring the current signal and transmitting the current signal to the main control unit;
the second test circuit is provided with at least one current interface connected with the current detection device and a second current sensor used for acquiring a current signal and transmitting the current signal to the main control unit;
The third test circuit is provided with at least one temperature interface connected with the temperature detection device, a thermistor arranged at the temperature interface and a third current sensor connected with the thermistor, and the third current sensor can output different current signals according to the resistance value of the thermistor.
The voltage detection device can be a voltmeter, the current detection device can be an ammeter, and the temperature detection device can be a temperature sensor. After the design is adopted, the main control unit can acquire data of the voltmeter, the ammeter, the temperature sensor and the like and display the data through the display unit.
Referring to fig. 2, a first test circuit according to the present utility model includes: resistor R3, resistor R11, resistor R13, resistor R14, capacitor C11, and voltage chip U2;
The first pin of the voltage chip U2 is connected with the main control unit in series with the resistor R14, the second pin is grounded, the third pin is connected with the resistor R13 in series with the resistor R11, the third pin is connected with the voltage detection device as a first input end of a first test circuit, the fourth pin is connected with the voltage detection device as a second input end of the first test circuit, the fifth pin is grounded, and the sixth pin is connected with a 3.3V power supply;
One end of the resistor R3 is connected between the resistor R13 and the third pin, the other end of the resistor R3 is connected between the resistor R11 and the fourth pin, and one end of the capacitor C11 is connected between the 3.3V power supply and the sixth pin, and the other end of the capacitor C11 is grounded.
The first input end is V+ and the second input end is V-, and the main control unit can acquire corresponding experimental data through the GPIO26-ADC0 pin and convert the experimental data into digital signals when the voltage detection device is used and only needs to be connected to a corresponding voltage detection device through the V+ and the V-, and the voltage detection device is displayed through the display unit.
Referring to fig. 3, the second test circuit provided in the present utility model is composed of a resistor R4, a resistor R16, a capacitor C16, and a voltage chip U4, and the working principle is similar to that of the first test circuit shown in fig. 2, and is not repeated here.
Further, the testing device further comprises: student power supply, laser and light screen;
The test circuit further comprises a fourth test circuit connected with a student power supply, a fifth test circuit connected with a laser and a sixth test circuit connected with a light screen;
The fourth test circuit, the fifth test circuit and the sixth test circuit all comprise a test interface connected with the test device and a control interface connected with the main control unit.
Referring to fig. 4, the fourth test circuit includes: transistor Q2, resistor R15, diode D4;
The base of the triode Q2 is connected in series with the resistor R15 and then is used as a control interface of a fourth test circuit to be connected to the main control unit, the collector is grounded, the emitter is connected to the cathode of the diode D4, and the anode of the diode D4 is used as a test interface of the fourth test circuit to be connected to the test device.
The working principle is that the power supply is connected to a student power supply (relay control) through a diode D4, and then the conduction state of a triode Q2 is controlled through the level sent by a main control unit, so that the control of the student power supply (relay control) can be realized.
Referring to fig. 5 and 6, the fifth test circuit is composed of a transistor Q1, a resistor R12 and a diode D13, and the sixth test circuit is composed of a transistor Q4, a resistor R22 and a diode D5, and the working principle is similar to that of the fourth test circuit, so that the description thereof will not be repeated here.
Further, the test device further includes: dynamometer and balance;
The test circuit further comprises a seventh test circuit connected with the dynamometer and an eighth test circuit connected with the balance, and the seventh test circuit and the eighth test circuit are used for transmitting experimental data of the dynamometer and the balance to the main control unit.
Referring to fig. 1, since the load cell, the balance, etc. can directly work and display the corresponding experimental data, the seventh test circuit and the eighth test circuit are designed to be only directly connected with the main control unit to transmit the corresponding experimental data.
Please refer to fig. 7, which is a schematic diagram of a topology of a power supply circuit when disposed in a physical experiment box, in this embodiment, the power supply circuit includes: a voltage conversion chip U3, a capacitor C14 and a capacitor C15;
The first pin of the voltage conversion chip U3 is grounded, the second pin and the fourth pin are used for outputting working voltage for the main control unit to work, and the third pin is connected to an external power supply;
the capacitor C14 is connected between the first pin and the second pin, one end of the capacitor C15 is connected between the third pin and an external power supply, and the other end of the capacitor C15 is grounded.
The voltage conversion chip U3 is of the type AMS1117, and can convert an external power supply into a power supply output of 3.3V so as to meet the use requirements of all the partial circuits in the utility model.
Referring to fig. 8, when the voltage conversion chip is directly disposed in the testing device, the voltage conversion chip can be TLC 6753 OP DBVR, which can convert the external power into 3V power for output, so as to meet the use requirement of the testing device.
Referring to fig. 9, in the physical experiment control circuit provided by the present utility model, the physical experiment control circuit further includes a communication circuit for externally connecting the display unit, and the communication circuit includes a communication chip UN, a diode D2, and a triode Q3;
The first pin of the communication chip UN is connected to the anode of the diode D2, the second pin is used as a first output end of the communication circuit to be externally connected with the display unit, and the third pin is used as a second output end of the communication circuit to be externally connected with the display unit, the fourth pin, the fifth pin and the sixth pin to be grounded;
The cathode of the diode D2 is used as a detection pin to output VBUS voltage, the base electrode of the triode Q3 is connected to the main control unit, the collector electrode is grounded, and the emitter electrode is connected to a third pin.
The communication circuit is used for being connected to the display unit, and then experimental data are displayed on the display device.
Further, in the present utility model, the master control unit adopts a single chip microcomputer, which has a plurality of digital pins GPIO and a plurality of analog-to-digital conversion pins GPIO-ADC, as shown in fig. 10, which is a master control unit designed in a physical experiment box, and adopts a single chip microcomputer with a model number of rareberry Pi RP2040, which has digital pins GPIO0 to GPIO25 and analog-to-digital conversion pins GPIO-ADC0 to GPIO-ADC3. The test circuits are respectively connected to the test circuits, can acquire experimental data, and perform analog-to-digital conversion, so that the experimental data are sent to the display device for display in a digital signal form.
Fig. 11 shows a master control unit with one ADC pin and multiple GPIO pins when it is designed in a test device.
According to the utility model, the main control unit is matched with each test circuit, so that the control of various test devices can be realized, or corresponding experimental data can be obtained, and the purpose of being compatible with various physical experiments can be achieved.
Compared with the prior art, the utility model has at least the following beneficial effects:
1. According to the utility model, the plurality of test circuits are designed to be matched with various test devices for physical experiments and are connected to the main control unit at the same time, and the main control unit is used for controlling the main control unit to start or receive experimental data, so that the utility model can be compatible with various physical experiments at the same time and meets the physical experiment requirements of students;
2. The physical experiment control circuit provided by the utility model can be directly arranged on a circuit board in a physical experiment box to realize the aim of being compatible with various physical experiments, and can also be directly arranged in a testing device, so that the physical experiment control circuit can meet the experiment requirements of the testing devices, and can be separated from the physical experiment box, thereby being convenient for students to operate.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (8)
1. A physical experiment control circuit, comprising:
The test circuits are arranged in a one-to-one matching way with the test devices for physical experiments and are used for triggering the test devices or acquiring experimental data of the test devices;
The main control unit is connected with all the test circuits and provided with a plurality of digital-to-analog conversion interfaces for converting the experimental data into digital signals;
The power supply circuit is connected with an external power supply and is used for converting the output voltage of the external power supply into the working voltage of the physical experiment control circuit;
The physical experiment control circuit can be assembled in the testing device or integrated in the physical experiment box, and when integrated in the physical experiment box, the physical experiment control circuit further comprises a display unit, wherein the display unit is used for displaying the experiment data.
2. The physical experiment control circuit according to claim 1, wherein the test device comprises: voltage detection means, current detection means, and temperature detection means;
The test circuit comprises a first test circuit connected with the voltage detection device, a second test circuit connected with the current detection device and a third test circuit connected with the temperature detection device;
The first test circuit is provided with at least one voltage interface connected with the voltage detection device, a conversion resistor for converting a voltage signal into a current signal, and a first current sensor for acquiring the current signal and transmitting the current signal to the main control unit;
The second test circuit is provided with at least one current interface connected with the current detection device and a second current sensor used for acquiring a current signal and transmitting the current signal to the main control unit;
The third test circuit is provided with at least one temperature interface connected with the temperature detection device, a thermistor arranged at the temperature interface and a third current sensor connected with the thermistor, and the third current sensor can output different current signals according to the resistance value of the thermistor.
3. The physical experiment control circuit according to claim 2, wherein the first test circuit comprises: resistor R3, resistor R11, resistor R13, resistor R14, capacitor C11, and voltage chip U2;
the first pin of the voltage chip U2 is connected with the resistor R14 in series and then is connected with the main control unit, the second pin is grounded, the third pin is connected with the resistor R13 in series and then is used as a first input end of the first test circuit to be connected with the voltage detection device, the fourth pin is connected with the resistor R11 in series and then is used as a second input end of the first test circuit to be connected with the voltage detection device, the fifth pin is grounded, and the sixth pin is connected with a 3.3V power supply;
One end of the resistor R3 is connected between the resistor R13 and the third pin, the other end of the resistor R11 is connected between the resistor R11 and the fourth pin, and one end of the capacitor C11 is connected between a 3.3V power supply and the sixth pin, and the other end of the capacitor C11 is grounded.
4. The physical experiment control circuit according to claim 1, wherein the test device further comprises: student power supply, laser and light screen;
The test circuit further comprises a fourth test circuit connected with the student power supply, a fifth test circuit connected with the laser, and a sixth test circuit connected with the screener;
The fourth test circuit, the fifth test circuit and the sixth test circuit all comprise a test interface connected with the test device and a control interface connected with the main control unit.
5. The physical experiment control circuit according to claim 4, wherein the fourth test circuit comprises: transistor Q2, resistor R15, diode D4;
the base electrode of the triode Q2 is connected in series with the resistor R15 and then is used as a control interface of the fourth test circuit to be connected to the main control unit, the collector electrode is grounded, the emitter electrode is connected to the cathode electrode of the diode D4, and the anode electrode of the diode D4 is used as a test interface of the fourth test circuit to be connected to the test device.
6. The physical experiment control circuit according to claim 1, wherein the test device further comprises a load cell, a balance;
The test circuit further comprises a seventh test circuit connected with the dynamometer and an eighth test circuit connected with the balance, and the seventh test circuit and the eighth test circuit are used for transmitting experimental data of the dynamometer and the balance to the main control unit.
7. The physical experiment control circuit according to claim 1, wherein the power supply circuit includes: a voltage conversion chip U3, a capacitor C14 and a capacitor C15;
The first pin, the second pin and the fourth pin of the voltage conversion chip U3 are used for outputting working voltage for the main control unit to work, and the third pin is connected to an external power supply;
the capacitor C14 is connected between the first pin and the second pin, and one end of the capacitor C15 is connected between the third pin and an external power supply, and the other end of the capacitor C is grounded.
8. The physical experiment control circuit according to claim 1, further comprising a communication circuit for externally connecting the display unit, and wherein the communication circuit comprises a communication chip UN, a diode D2, and a triode Q3;
The first pin of the communication chip UN is connected to the positive electrode of the diode D2, the second pin is used as a first output end of the communication circuit to be externally connected with the display unit, and the third pin is used as a second output end of the communication circuit to be externally connected with the display unit, the fourth pin, the fifth pin and the sixth pin to be grounded;
The cathode of the diode D2 is used as a detection pin to output VBUS voltage, the base electrode of the triode Q3 is connected to the main control unit, the collector electrode is grounded, and the emitter electrode is connected to the third pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322950614.3U CN221079210U (en) | 2023-11-01 | 2023-11-01 | Physical experiment control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322950614.3U CN221079210U (en) | 2023-11-01 | 2023-11-01 | Physical experiment control circuit |
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| CN221079210U true CN221079210U (en) | 2024-06-04 |
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| CN202322950614.3U Active CN221079210U (en) | 2023-11-01 | 2023-11-01 | Physical experiment control circuit |
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| CN (1) | CN221079210U (en) |
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