CN2394255Y - Computer interface for teaching - Google Patents
Computer interface for teaching Download PDFInfo
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- CN2394255Y CN2394255Y CN 99214442 CN99214442U CN2394255Y CN 2394255 Y CN2394255 Y CN 2394255Y CN 99214442 CN99214442 CN 99214442 CN 99214442 U CN99214442 U CN 99214442U CN 2394255 Y CN2394255 Y CN 2394255Y
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Abstract
The utility model discloses a computer interface for teaching, which is composed of a shell and a circuit portion arranged in the shell. The shell is provided with an input end for an AC power source and a plurality of input plug-in ends for analog and digital signals, and the circuit portion comprises a microprocessor unit, a memory unit, a standard communication interface unit, a plurality of analog and digital channel units and a power unit. After the analog and digital signals inputted from the input plug-in ends for analog and digital signals are processed by the analog and digital channel units, the analog and digital signals are inputted into an I/O end of the microprocessor unit. The output signals from the microprocessor unit are connected to a standard communication plug-in end which is arranged on the shell through the standard communication interface unit, and the standard communication plug-in end is provided with a transmission cable connecting a computer standard communication interface. The utility model has the advantages of interference reduction, easy expansion, and convenient operation.
Description
The utility model relates to a kind of experimental teaching unit, particularly relates to a kind of education experiment computer interface unit that utilizes computing machine to do experimental terminal.
Computing machine in the application of education sector through for many years theoretical developments and teaching practice, progressively formed the teaching pattern of CAI---with the computing machine means, operation with teaching software, courseware launches teaching process, reaches teaching purpose by the interacting activity between student and the microcomputer.And such as physics etc., as an experimental very strong subject, experimental teaching has more indispensable status in its teaching.Because the restriction of objective condition, existing instruments used for education often are difficult to finish preferably various Physical Experiments.For example gas law experiment, existing experimental apparatus error is bigger; The experiment that calorifics air compression temperature raises, because factor such as compression speed is fast inadequately during practical operation, naked eyes are difficult to see the actual less relatively variation of temperature; Acoustics experiment routine can only be made of tuning fork, and can not make of oneself sound, tone; Electromagnetic induction experiment can only be made of solid conductor in the past.Limitation is bigger, repeatability directly perceived, interesting poor, and a large amount of valuable time in classroom of each experiment waste, it is but very little to produce effects.
Therefore, such as the computer-aided instruction in the physics teaching, except CAI and Multimedia assisted instruction, must introduce computer real-time measuring technique in the modern science and technology, utilize computer to do experimental terminal, by interface circuit, sensor and conventional instrument finish jointly experimental subjects measurement, data processing and analysis, draw experimental result and make curve, help the observation of students experimental phenomena, explore principle, sum up objective law.
Chinese patent 95200003.2, a kind of Physical Experiment computer interface aided education device is disclosed, referring to shown in Figure 1, it is that the signal of breakboard construction, sensor output is delivered to an interface extension box, after shaping, processing and amplifying, delivers to an interface card again, this interface card is to be plugged in the bus slot of microcomputer, become digital signal to send in the microcomputer conversion of signals of gathering by this interface card and calculate, analyze, the chart that draws shows, and printable output result.Because the interface card of this device is in the bus slot that is plugged in the microcomputer, start i.e. energising, and easily produces the power supply interference, also very inconvenience in the use.Its sensor kind is limited in addition, and the experiment kind that experiment software is supported is limited, does not provide the user expanded function voluntarily simultaneously.
In view of the foregoing, the purpose of this utility model just is to provide a kind of novel education experiment computer interface unit, and the transport communication that it can finish data command by standard interface and host computer reduces to disturb, and expands convenient the use easily.
The purpose of this utility model is achieved through the following technical solutions: a kind of education experiment computer interface unit, form by housing and the circuit part be located in the housing, its middle shell is provided with ac power input end and a plurality of simulation, digital signal input inserted terminal, described circuit part comprises microprocessor unit, memory cell, standard traffic mouth unit, a plurality of simulations and digital channel unit and power supply unit, these a plurality of simulations, the simulation that digital signal input inserted terminal is introduced, digital signal is through a plurality of simulations and digital channel unit, the I/O port of input microprocessor unit, the output signal of microprocessor unit is connected to the standard traffic inserted terminal of being located on the housing through standard traffic mouth unit, and this standard traffic inserted terminal has transmission cable to connect computer standard traffic mouth.
Above-mentioned standard traffic mouth unit can be standard RS-232 serial communication unit or standard parallel communications unit, and the standard traffic inserted terminal is RS-232 grafting port or standard parallel communications grafting port.
According to technique scheme, described microprocessor unit is 80196 single-chip microcomputers, described memory cell comprises outer RAM 6264 of sheet and ROM 2764, described standard RS-232 serial communication unit adds level transferring chip MAX232 by 80196 interior serial ports unit and forms, described standard parallel communications unit is an expansion I/O mouth chip 8155, described a plurality of analog channels unit imports the unity gain buffer amplifier by programme-controlled gain differential amplifier or homophase and 80196 interior A/D converting units are formed, and described a plurality of digital channels unit connects 80196 I/O ports by the shaping of voltage comparator buffering.
According to technique scheme, described circuit part also further comprises the averaging circuit unit, its input end connects the width modulation end of described 80196 single-chip microcomputers, output terminal connects program control reference signal adjustable side, the program control silicon controlled trigger end of described analog channel unit respectively and is located at D/A output terminal on the housing, and this program control controllable silicon outputs to the SCR AC power supply output wiring terminal of being located on the housing.
According to technique scheme, described expansion I/O mouth chip 8155 ports havings output connects light-coupled isolation and power driving circuit, and output is connected to the step motor control terminals of being located on the housing.
Described housing is provided with the accessory power supply outlet terminal, comprise direct current ± 8V, ± 5V with exchange 3V.
The utility model is compared with existing teaching and experiment equipment, it is the change of measuring method and means, carry out education experiment with the computer real-time measuring technique, can finish the experiment that some conventional instruments are difficult to finish, and saved the time, improve precision, left student's more time for and ponder a problem, understood the intension of experiment.
The utility model adopts 16 80196 single-chip microcomputers as control assembly, independently carry out data acquisition, real-time is good, carries out the transmission of communicating by letter of order, data by standard string, parallel port with up-computer, be independent of up-computer on the hardware, reduced the interference of computing machine the data collecting part.In addition,, make mounting or dismounting convenient, be easy to safeguard owing to do not establish interface card in the computing machine.Simultaneously, can be connected with multiple sensors and traditional experiment instrument, the standard traffic mouth can cooperate the formation experimental system with multiple host computer, expands easily, and use more extensively, conveniently.
Below in conjunction with drawings and the specific embodiments the utility model is further described in detail again.
Fig. 1 is the structural representation of prior art.
Fig. 2 is the circuit block diagram of the utility model.
Fig. 3 is the application structure synoptic diagram of the utility model.
Fig. 4 is one of the utility model circuit diagram.
Fig. 5 is two of the utility model circuit diagram.
Fig. 6 is three of the utility model circuit diagram.
At first see also Fig. 2 to shown in Figure 6, a kind of education experiment computer interface unit of the utility model is made up of housing and the circuit part be located in the housing, and its middle shell is provided with ac power input end and a plurality of simulation, digital signal is imported inserted terminal.Described circuit part comprises microprocessor unit 1, memory cell 2, standard traffic mouth unit 3, a plurality of analog channels unit 4, a plurality of digital channels unit 5 and power supply unit 6, housing is provided with simulation, digital signal input inserted terminal, the simulation of input, digital signal is respectively through analog channel unit 4 and the I/O port of 5 input microprocessor unit 1, digital channel unit, after microprocessor processes, output signal is connected to the standard traffic inserted terminal of being located on the housing through standard traffic mouth unit 3, and this standard traffic inserted terminal connects computer standard traffic mouth by cable.
At the utility model embodiment, above-mentioned standard traffic mouth unit is standard RS-232 serial communication unit or standard parallel communications unit, can carry out communicating by letter of order, data with up-computer by standard serial mouth or parallel port.
Referring to shown in Figure 4, the utility model embodiment microprocessor unit 1 adopts U1 80196 single-chip microcomputers, with program storage U3 2764, data-carrier store U4 6264 and the basic Single Chip Microcomputer (SCM) system of the common formation of address latch U2 74LS373.
Standard RS-232 serial communication unit adds level transferring chip U6MAX232 by the serial ports unit in 80196 of the U1 and constitutes three-way full duplex RS232 level asynchronous serial port, add the RTS and the CTS line of two PCs, behind the electrification reset, the serial port baud rate is 9600,8 data bit, 1 position of rest, available command changes baud rate, communication baud rate optional 4800,9600,19200,25600 ..., maximum can arrive 115200.
Standard parallel communications unit realizes that by a slice parallel I/O mouth 8155 of expansion 8155 comprise two 8 mouths, 6 mouths, one 13 counter and 256 bytes of memory devices.Counter is used for carrying out the frequency measurement of simulating signal, and the PB mouth is inner to be used, and PA mouth and PB all draw with standard 36 line printer connection-pegs, can pass through parallel port communication with PC on this port, also can expand other parts on this mouthful.
Referring to shown in Figure 5, the utility model embodiment has three analog input channel A, B, C, and the precision of its analog-converted all is 10 (scale-of-two), full scale 5V, and be 25 μ S switching time.The A channel enlargement factor is PC5, the PC4 control by 8155, and the A channel available programs is regulated the zero migration position, and 0-2.5V divides 256 grades.B, C-channel are homophase input unity gain buffer amplifiers, and input reference signal is-2.5V-+2.5V.Triple channel can not be used simultaneously, restarts another passage after must a passage converting.Through shaping circuit, CLK3 is connected to 80196 counters inputs to passage A behind amplifier, thereby can carry out the ac small signal (frequency measurement of f＜100KHz).
Pulse-width modulation PWM 2 ends by 80196 are by the pulse signal series of programmed control output different duty, behind averaging circuit, export corresponding D/A analog voltage signal DA2 by follower LM324 buffering, amplitude is 0-5V, 8 bit resolutions, low speed changes, and can be used as the reference signal that the A channel program is regulated.
The utility model embodiment has four way word input channel D, E, F, G, circuit structure is identical with working method, input end cushions shaping through voltage comparator, deliver to 80196 high speed input end HSIO-HSI3 respectively, carrying out pulse event with 80196 catches, the moment that can each port level of survey record changes, thus pulsewidth, interval of each channel signal etc. can be measured, be equivalent to four logic analysers.The E passage can also utilize 80196 counter measures frequency, and temporal resolution is 1.45 μ S, requires the input signal high level greater than 3V, and low level at the inner pull-up resistor that receives of input end, can directly connect photogate less than 1V.Each passage also provides an auxiliary power supply line for the power valve power supply of photogate.When the simulation storage oscilloscope, these four passages also can be used as the trigger pip input end.
Adopt sawtooth wave and PWMO changing voltage relatively to trigger the silicon controlled working method, program control silicon controlled conduction angle resolution reaches 180 °/256, and 1 ampere of output current (200W) provides external interchange regulated power supply, can be used for light modulation, heating etc.
PCO-PC3 by 8155 provides control signal, carries out power drive with ULN2003 after optocoupler TLP521-4 isolates, and can drive three-phase or four phase step motor.Every road also can be used to drive other loads such as relay, direct current generator separately.ULN2003 is open collector output, the band catching diode, and every road can drive 50V/0.5A.
Referring to Fig. 6, exchange input and provide digital circuit 5V power supply through transformation, rectification, simulating signal with power supply ± 8V, ± 5V, and as accessory power supply output is drawn for other experimental part use.
The utility model housing has front and back panel.Front panel is provided with power switch, pilot lamp, three 5 core aviation sockets of A, B, C three tunnel analog channels, four 3 core aviation sockets of D, E, F, G four way word passages, D/A output Q9 high-frequency socket, the DB9/F socket of step motor control.Rear panel is provided with AC power cord, fuse holder, and accessory power supply is exported 4 core aviation sockets, serial port DB9/M socket, SCR AC power supply output wiring terminal.
The signal that the utility model is sent through sensor by simulation, digital channel input experimental apparatus, after corresponding A/D conversion, handling, carry out data communication by standard string, parallel port and host computer, experimental data is carried out management such as online real time collecting, processing, mapping, storage, printing by host computer.The utility model course of work is controlled by communication port transferring command and parameter by host computer, and command set comprises: state setting, state read, process control, system read-write order, are started and are ended to measure gatherer process by the process control order.The utility model groundwork procedure declaration is as follows:
(1) at first carry out initialization after initial state 80196 powers on, inquire about parallel port and serial port then, which place has initialization command then to select it as communication port, enters the attitude of awaiting orders after replying.Host computer at first constantly sends reset command at used communication port, until receive 80196 send reply till.When parallel port does not expand other parts, use parallel port communication as far as possible to accelerate communication speed.
(2) attitude 80196 of awaiting orders enters the attitude of awaiting orders, and the inquiry communication port prepares to receive order.
(3) after order reception attitude 80196 receives order first character, enter the order analysis processing procedure, the arrangement input parameter.If can not differentiate the order that identification is received, then omit and do not handle, the notice host computer enters the attitude of makeing mistakes.If order is correct, then enter the command process attitude.
(4) command process attitude 80196 is just at processing command, and during serial port communication, 80196 to make the CTS end be 0, and during parallel port communication, 80196 to make 8155 PC mouth output terminal be 00H, and expression can not be accepted newer command, and execution subroutine is got back to the attitude of awaiting orders after handling the current command.
(5) make mistakes attitude if the command format received not to or parameter not right, then omit and do not handle, receive attitude from order and enter the attitude of makeing mistakes, the host computer former order of cancellation that says the word, 80196 receive orders gets back to the attitude of awaiting orders.
When (6) echo back data attitude 80196 is handled some order, echo back data, then enter the echo back data attitude from the command process attitude.80196 send after the data of specifying number, get back to the attitude of awaiting orders.
The host computer application software is moved under the Windows95 environment, and provides the user optionally to increase the function of new experiment content voluntarily at any time.Computing machine can carry out online real time collecting, processing, mapping, storage, printing etc. to experimental data by sensor and traditional experimental apparatus.
Claims (7)
1, a kind of education experiment computer interface unit, form by housing and the circuit part be located in the housing, its middle shell is provided with ac power input end and a plurality of simulation, digital signal input inserted terminal, it is characterized in that: described circuit part comprises microprocessor unit, memory cell, standard traffic mouth unit, a plurality of simulations and digital channel unit and power supply unit, these a plurality of simulations, the simulation that digital signal input inserted terminal is introduced, digital signal is through a plurality of simulations and digital channel unit, the I/O port of input microprocessor unit, the output signal of microprocessor unit is connected to the standard traffic inserted terminal of being located on the housing through standard traffic mouth unit, and this standard traffic inserted terminal has transmission cable to connect computer standard traffic mouth.
2, education experiment computer interface unit according to claim 1 is characterized in that: described standard traffic mouth unit is a standard RS-232 serial communication unit, and described standard traffic inserted terminal is a RS-232 grafting port.
3, education experiment computer interface unit according to claim 1, it is characterized in that: described standard traffic mouth unit is that standard RS-232 serial communication unit adds standard parallel communications unit, and described standard traffic inserted terminal comprises RS-232 grafting port and standard parallel communications grafting port.
4, according to claim 1,2 or 3 described education experiment computer interface units, it is characterized in that: described microprocessor unit is 80196 single-chip microcomputers, described memory cell comprises outer RAM 6264 of sheet and ROM 2764, described standard RS-232 serial communication unit adds level transferring chip MAX232 by 80196 interior serial ports unit and forms, described standard parallel communications unit is an expansion I/O mouth chip 8155, described a plurality of analog channels unit imports the unity gain buffer amplifier by programme-controlled gain differential amplifier or homophase and 80196 interior A/D converting units are formed, and described a plurality of digital channels unit connects the 80196I/O port by the shaping of voltage comparator buffering.
5, education experiment computer interface unit according to claim 4, it is characterized in that: described circuit part also further comprises the averaging circuit unit, its input end connects the width modulation end of described 80196 single-chip microcomputers, output terminal connects program control reference signal adjustable side, the program control silicon controlled trigger end of described analog channel unit respectively and is located at D/A output terminal on the housing, and this program control controllable silicon outputs to the SCR AC power supply output wiring terminal of being located on the housing.
6, education experiment computer interface unit according to claim 4 is characterized in that: described expansion I/O mouth chip 8155 ports havings output connects light-coupled isolation and power driving circuit, and output is connected to the step motor control terminals of being located on the housing.
7, education experiment computer interface unit according to claim 1, it is characterized in that: described housing is provided with the accessory power supply outlet terminal, comprise direct current ± 8V, ± 5V with exchange 3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99214442 CN2394255Y (en) | 1999-06-25 | 1999-06-25 | Computer interface for teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99214442 CN2394255Y (en) | 1999-06-25 | 1999-06-25 | Computer interface for teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2394255Y true CN2394255Y (en) | 2000-08-30 |
Family
ID=34006620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99214442 Expired - Fee Related CN2394255Y (en) | 1999-06-25 | 1999-06-25 | Computer interface for teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2394255Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630461B (en) * | 2009-08-13 | 2011-01-05 | 北京航空航天大学 | Electronic measuring and teaching device and using method thereof |
| CN105548643A (en) * | 2016-02-15 | 2016-05-04 | 中国石油大学(华东) | Novel multifunctional electrical parameter tester |
| CN104158564B (en) * | 2014-05-23 | 2016-08-17 | 国家电网公司 | Low-voltage powerline carrier communication affects tentative module |
| CN114900705A (en) * | 2022-06-10 | 2022-08-12 | 合肥云联半导体有限公司 | Transmission processing method for vehicle-mounted audio and video data |
-
1999
- 1999-06-25 CN CN 99214442 patent/CN2394255Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630461B (en) * | 2009-08-13 | 2011-01-05 | 北京航空航天大学 | Electronic measuring and teaching device and using method thereof |
| CN104158564B (en) * | 2014-05-23 | 2016-08-17 | 国家电网公司 | Low-voltage powerline carrier communication affects tentative module |
| CN105548643A (en) * | 2016-02-15 | 2016-05-04 | 中国石油大学(华东) | Novel multifunctional electrical parameter tester |
| CN105548643B (en) * | 2016-02-15 | 2023-03-10 | 中国石油大学(华东) | Novel multi-functional electric parameter tester |
| CN114900705A (en) * | 2022-06-10 | 2022-08-12 | 合肥云联半导体有限公司 | Transmission processing method for vehicle-mounted audio and video data |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |