CN201886676U

CN201886676U - Singlechip experimental box

Info

Publication number: CN201886676U
Application number: CN 201020599882
Authority: CN
Inventors: 陈善荣; 曾庆立
Original assignee: Jishou University
Current assignee: Jishou University
Priority date: 2010-11-01
Filing date: 2010-11-01
Publication date: 2011-06-29
Anticipated expiration: 2020-11-01

Abstract

The utility model relates to a singlechip experimental box, which belongs to the technical field of teaching instruments. The experimental box comprises a circuit board, a common tool, an electronic element package and a universal board which are mounted in the box body, wherein the circuit board comprises a power panel for providing adjustable output voltages of +/-12V, +5V and +1.25V to +12V, a control board and an expansion board, and the control board is provided with an MCU (Microprogrammed Control Unit), a button, a seven-segment digital display tube, an RS-232/TTL level converter and a buzzer; the power panel, the control board and the expansion board are connected through a lead wire with a self-locking connector; and a parallel port of the MCU can be separated from other circuits on the control board through a toggle switch, so as to be completely expanded and connected to the expansion board. The singlechip experimental box is suitable for students to do innovative design experiments.

Description

The single chip computer experiment case

Technical field

The utility model relates to a kind of teaching experimental box, and especially a kind of MCS-51 series monolithic experimental box belongs to technical field of teaching instruments.

Background technology

The experimental teaching purpose is to cultivate student experimenting manipulative ability, experimental study ability and innovation ability, thereby and the knowledge of theory teaching is obtained perceptual knowledge by experiment grasp this knowledge, therefore experimental teaching content has comprised checking, comprehensive, designability and novelty experimental project, Chinese student's experimental design ability and innovation ability generally are short of at present, this and experimental teaching equipment and teaching method are contacted directly, can progressively reach the purpose that improves student experimenting designed capacity and innovation ability by improving experimental teaching equipment and teaching method.

Chinese patent CN201134187Y discloses modularization single chip computer experiment case, comprise the main circuit board and the expander board that are placed in the casing, this main circuit board contains by printed board cabling single chip machine controlling circuit connected to one another, power circuit, display circuit, keyboard and external data interface, expanded circuit contains experimental circuit and interface, and experimental circuit is made of common modular circuits such as 18B20 thermometric experimental circuit, ADC0809 sampling experimental circuits.The advantage of this patented technology is the experiment that can solve student's property verified effectively, has improved the utilization factor of electronic component simultaneously, saves cost.But because the accessory circuit on the main circuit board has taken the too much port resource of MCU regularly, be unfavorable for that the student carries out the experiment of designability and novelty, do not provide independently electronic component to carry out design, installation, welding and the debugging of circuit for the student simultaneously, student's this necessary ability does not obtain taking exercise and cultivating.

The utility model content

The purpose of this utility model is can not solve the shortcoming that the student carries out designability and novelty experiment preferably at existing single chip computer experiment case, a kind of follow-on single chip computer experiment case is proposed, this experimental box not only is equipped with basic experimental circuit, also be equipped with experiment required instrument and electronic component, require the student from circuit design, element is installed, program design, system integration debugging waits each link to take action on one's own to experimentize, and the learning activities that can experimentize in the place of any permission, increased chance and content that student's experiment is started, made their experimental study ability, innovation ability obtains taking exercise and improving.

To achieve the above object, single chip computer experiment case of the present utility model comprises power supply circuit board, control circuit board, expander board, common tool and electronic package.Power supply circuit board wherein is an independently circuit board, three lead-in wires of the centre tapped 15V alternating current of input end connecting band, output terminal have output ± 12V ,+5V ,+1.25V～+ the 12V adjustable dc voltage and ground five output leads; Control circuit board wherein also is an independently circuit board, comprise on it and the resetting and the crystal oscillator accessory circuit of the interface of power supply circuit board, RS-232/TTL level converter circuit, key circuit, nixie display circuit, buzzer circuit, MCU, except that MCU reset and the crystal oscillator accessory circuit, can realize disconnecting or being connected by toggle switch between other circuit on the control circuit board and the parallel port of MCU, the parallel port of MCU can independently fully be expanded; What power supply circuit board and control circuit board adopted is PCB routing; Expander board wherein comprises at least four relatively independent modular circuits, be used to realize can be applicable to the function of real-life electronic product, expander board have with the interface of power panel, with the interface of control circuit board and the circuit of forming by electronic component, expansion board has adopted omnipotent plate, needs student's manual welding element and cabling; Common tool wherein comprises that carrying out circuit installs needed electric soldering iron, bottle opener, rosin, solder stick, tin-absorbing pump etc., carries out the needed multimeter of circuit test etc.; Element bag wherein comprises that resistance, electric capacity, diode, triode, integrated circuit, digital display tube, LCD display module, integrated infrared receiving module, dc micro-motor, lead etc. are used to make up the necessary electronic component commonly used of electronic application, device.

Power supply circuit board, control circuit board and expander board respectively are provided with four pilot holes, corresponding with four spicules on being installed in box bottom, realize relative fixed, can dismantle easily and reconfigure, interface on each circuit board and Extended Capabilities Port are connected to the self-locking socket, connection between each circuit board connects by the lead of band self-locking socket, install be connected very convenient.Expander board designs according to real-life needs, can realize the circuit of certain function.Can be by the timing that integrated circuit of clock DS1302, electromagnetic relay, electric bell and accessory circuit the are formed experimental circuit of ringing a bell; The infrared decoding that can form by LCD LCD1602, integrated infrared receiving module SM0038, infrared transmitting tube, Sheffer stroke gate integrated circuit 74LS00 and accessory circuit, coding experimental circuit; The thermostatic control experimental circuit that can form by digital temperature sensor DS18B20, power resistor, LCD LCD1602 and accessory circuit; The intelligent carriage experimental circuit that can form by infrared transmitting tube, infrared receiving tube, voltage comparator, pliotron, dc micro-motor and accessory circuit; It can also be self-designed other circuit of student, the student pinpoints the problems, designs the scheme of dealing with problems, the circuit theory diagrams that draw, design control procedure, makes up experimental circuit and debugging with electronic component by oneself, thereby takes exercise and improve its experiment designed capacity and innovation ability.Arrangements such as above-mentioned breakboard construction, instrument, electronic component or deposit in the experimental box, being convenient to the student carries, can be in the laboratory, places such as dormitory, classroom use, and have increased time and chance that the student uses one's hands and brains, improve student's designed capacity and innovation ability comprehensively.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is the novel general structure block diagram of this experiment.

Fig. 2 is the novel constant temperature control circuit schematic diagram of this experiment.

Fig. 3 is the novel power circuit principle figure of this experiment.

Fig. 4 is the novel control circuit schematic diagram of this experiment.

Fig. 5 is the novel timing of this experiment circuit theory diagrams of ringing a bell.

Fig. 6 is the novel infrared coding of this experiment, decoding circuit schematic diagram.

Fig. 7 is the novel intelligent carriage circuit theory diagrams of this experiment.

Embodiment

Among Fig. 1,1. power switch, 2. three core supply sockets, 3. power supply circuit board, 4. control circuit board, 5.7.9.10. is expander board, 6. positioning holes on circuit board and base plate nadel, 8. instrument cases, 11. base plates, 12. loose-leaves.The 220V civil power is connected to three core supply sockets 2 by three core power leads, the general supply of power switch 1 control experimental box, the 0.5A protective tube has been installed in casing, input 220V, output 15V are with centre tapped isolating transformer, three output terminals of this transformer low voltage 15V are connected to the input end of power supply circuit board 3, power supply circuit board with the rectification of low pressure 15V AC power, voltage stabilizing after output ± 12V ,+5V ,+1.25V～+ 12V adjustable DC voltage and common, and be connected to the self-locking seat, for being connected to other circuit board; Control circuit board 4 can be installed to the position of 4.5.7.9.10, determine according to experiment needs or ease of use, the power interface of control circuit board 4 is connected to power supply circuit board 3 by the lead of band self-locking seat, parallel port on the control circuit board 4 is connected to the self-locking seat, for being connected to expander board; Expander board can experimental needs be installed polylith or one simultaneously, and 24 nadels are installed on the base plate 11, and is corresponding with pilot hole on the circuit board, is used for fixing circuit board; Loose-leaf 12 is connected base plate 11 with the casing fixed part, base plate 11 can be opened about miter angle, and the space under the base plate is used for the stocked components bag; Instrument cases 8 are used to deposit circuit instruments such as instruments such as needed electric soldering iron, bottle opener, rosin, solder stick, tin-absorbing pump and the needed multimeter of circuit test are installed.

Among Fig. 2, power connector end J300 connects power panel+5V and common, + 5V connects VCC, be connected capacitor C 300 between VCC and the public ground, the two ends of C301 and potentiometer R300, the center-side of R300 is connected to the contrast adjustment end VEE of LCD display D300, the power end VCC of D300 is connected power supply VCC and common respectively with VSS, the control end RS of D300, R/W, E and data terminal DB0～DB7 are connected respectively to some pin of U100 parallel port on the control panel, the LED+ serial resistance R302 of D300 is connected to power supply VCC, the LED-of D300 is connected to common, high-power resistance R301 is connected to the emitter of power supply VCC and positive-negative-positive triode Q300, the grounded collector of Q300, certain pin that connects U100 parallel port on the control panel behind the base series resistor R303, the VDD of digital temperature sensor U300 is connected to power supply VCC, GND is connected to common, DQ is connected to certain pin of U100 parallel port on the control panel, when mounted R301 and U300 are close to installation, the blended rubber band twines, so that it fully contacts.Component parameters is selected: D300 can select the LCD1602 LCD; R300 can select 5K precision resistor 3296/502; R302 can select 1/2W 10 Europe; R301 can select 2～5W/10 Europe; U300 can select DS18B20; C300 can select the 16V/100uF alminium electrolytic condenser; C301 can select the 0.1uF ceramic disc capacitor; Q300 can select 8550; R303 can select 1/4W 1K; The pin that is connected to control panel U100 parallel port can freely be selected, as long as this pin is not taken by other circuit, has embodied bigger dirigibility.The pin that is connected to control panel U100 parallel port can freely be selected, as long as this pin is not taken by other circuit.

Among Fig. 3, the primary coil of three core socket J1, power switch S1, protective tube F1 and 220V/15V isolating transformer T1 is formed 220V civil power loop, the ac output end of the secondary coil of T1 is connected to the ac input end of bridge rectifier D 1, and center tap connects the common ground end; The dc output end V+ of D1 is connected to the positive terminal of capacitor C 1, C3, and is connected to the input end of circuit of three-terminal voltage-stabilizing integrated U1, U2, U3, and the negative pole end of C1, C3 connects public ground, and the earth terminal of U2, U3 connects public ground; The adjustable electric pressure side of U1 connects the center tap of adjustable potentiometer R1, two other end points of R1 connects output terminal and the common of U1, the output terminal of U1 also connects the positive terminal of capacitor C 9, C5, the negative pole end of C9, C5 connects common, the output terminal of U1 is exportable+1.25V～+ the 12V adjustable DC voltage, adjust potentiometer R1 usually and make it output voltage and be+3.3V; The output terminal of U2 connects the positive terminal of C10, C6, and the negative pole end of C10, C6 connects common, and the output terminal of U2 is exportable+the 5V DC voltage; The output terminal of U3 connects the positive terminal of C11, C7, and the negative pole end of C11, C7 connects common, and the output terminal of U3 is exportable+the 12V DC voltage; The dc output end V-of D1 is connected to the negative pole end of capacitor C 2, C4, and is connected to the input end of circuit of three-terminal voltage-stabilizing integrated U4, and the positive terminal of C2, C4 connects public ground, and the earth terminal of U4 connects public ground; The output terminal of U4 connects the negative pole end of C12, C8, and the positive terminal of C12, C8 connects common, and the output terminal of U4 is exportable-the 12V DC voltage; The series circuit of resistance R 2 and light emitting diode D2 is connected between the output terminal and public ground of U1, be used for the indication output+1.25V～+ the 12V adjustable DC voltage; The series circuit of resistance R 3 and light emitting diode D3 is connected between the output terminal and public ground of U2, is used for indication output+5V DC voltage; The series circuit of resistance R 4 and light emitting diode D4 is connected between the output terminal and public ground of U3, is used for indication output+12V DC voltage; The series circuit of resistance R 5 and light emitting diode D5 is connected between the output terminal and public ground of U4, is used for indication output-12V DC voltage.Each component parameters can be selected: it is the plate glass insurance pipe of 0.5A that protective tube F1 can select rated operational current, transformer T1 can select 220V/15V output band center tap, power is 5～10 watts Industrial Frequency Transformer, D1 can select commutated current more than or equal to 1A, voltage is the rectifier bridge heap of 100V or is barricaded as rectifier circuit with 4 1N4001, capacitor C 1, C2 selects the 470uF/25V alminium electrolytic condenser, capacitor C 3～C8 can select the 0.01uF ceramic disc capacitor, capacitor C 9～C12 can select the electrochemical capacitor of 10uF/16V, U1 can select LM317, U2 can select 7805 (needing radiation fin), U3 can 7812, U4 optional 7912, current-limiting resistance can be selected 1/4 watt of metalfilmresistor, and it is the LED luminotron of 3mm or 5mm that D2～D5 can select diameter.

Among Fig. 4, single-chip microcomputer U100 is the MCS-51 series monolithic, and parallel port P10～P17, P20～P27, P30～P37, the P40～P47 of U100 connect the self-locking seat respectively, for being connected to expander board; The crystal oscillating circuit of U100 is made up of Y100, C100 and C101, and the two ends of Y100 connect crystal oscillator link XTAL1 and the XTAL2 of U100, and the two ends of Y100 are connected common by C100 with C101; From power panel input+5V and common be connected to J107 self-locking seat, + 5V connects VCC, be connected series circuit, C102 and the series circuit of R108 composition, the two ends touch-switch S107 in parallel of C102 that capacitor C 104, C103, R107 and D101 form between VCC and the ground respectively, C102 is connected with R108 to hold and is connected with the reset terminal RST of U100, and S107, C102 and R108 have formed electrification reset and the manual reset circuit of single-chip microcomputer U100; Parallel port P20～P27 of U100 is connected to 8 pins of 8 toggle switch S100, other 8 pins of S100 are connected to pull-up resistor R100, and the common port of R100 connects VCC; The termination common of contact button S101～S104, the other end are connected respectively on 4 tie points that R100 is connected with S100; 4 common ports of 4 digital display tube D100 of common cathode are connected respectively to the emitter of positive-negative-positive switch triode Q100～Q103, be connected respectively to other 4 tie points that R100 is connected with S100 behind the base series resistor R101 of Q100～Q103～R104, the collector of Q100～Q103 is connected to common, can stir S100 and realize the parallel port P20～P27 of U100 and being connected or disconnection of button and digital display circuit; 8 graphemic code pins of D100 are connected respectively to 8 pins of toggle switch S105, other 8 pins of S105 are connected respectively to 8 pins of toggle switch S106, other 8 pins of S106 are connected respectively to pull-up resistor R106, the common port of R106 connects VCC, parallel port P00～P07 of U100 is connected respectively to 8 pins that S105 is connected with S106, can realize the parallel port P00～P07 of U100 and being connected and the disconnection relation of pull-up resistor, D100 graphemic code pin with S106 by stirring S105; RS232-TTL level conversion integrated circuit U101, capacitor C 105～C108, DB9 connector J105, three core socket J106 have formed two groups of serial communications and level is rotated circuit, 4 Transistor-Transistor Logic level signal pins of U101 are connected respectively to 4 pins among the toggle switch S108, and corresponding other 4 pins of S108 are connected respectively to P30, P31, P12, the P13 of U1; The end of hummer U102 connects VCC, the other end connects the emitter of positive-negative-positive triode Q104, the 5th pin that the collector of Q104 connects publicly, base series resistor R105 is connected to S108, the pin of the correspondence of S108 is connected to the P46 pin of U100, stirs S108 and can realize being connected of level shifting circuit, buzzer circuit and U100 or disconnect relation.It is STC12C5A60S2 (44 pins) that the selection of component parameters: U100 can select model, and R100 selects 56K*8, and R106 selects 470*8, and R101～R105 selects 1/4W 1K, and R107 selects 1/4W 560 Europe, and R108 selects 1/4W 8.2K; C100, C101 select 27pF, and C102 selects the 16V/10uF alminium electrolytic condenser, and C103 selects the 16V/100uF alminium electrolytic condenser, and C104 selects the 0.1uF ceramic disc capacitor, and C105～C108 selects the 16V/1uF alminium electrolytic condenser; Q100～Q103 selects SA1015, and Q104 can select 8550; D101 selects 3mm LED luminotron; S100, S105, S106 select 8 toggle switchs, and S108 selects 5 toggle switchs, and S101～S104, S107 select touch-switch; U100 can select STC12C5A60S2, and U101 can select MAX232CPE, and U102 selectively operating voltage is that the energising of 6V can be from the HXD of sounding hummer; Crystal oscillator Y100 can select the passive crystal oscillator of 11.0592MHz.

Among Fig. 5, the power pins VCC2 of digital dock integrated circuit U401 be connected to the power supply VCC that sends here from power panel (+5V), the standby power supply pin VCC1 of U401 is connected to the positive pole of 3.6V lithium battery BT400, the negative pole of BT400 connects common, the series circuit that VCC forms by resistance R 403 and commutator tube D401 is connected to the positive pole of BT400, the crystal oscillator Y400 that the crystal oscillator pin X1 of U401 and X2 are connected to 32.768KHz, the grounding pin GND of U401 is connected to common, the reset pin RST of U401, data pin I/O, serial clock pin SCLK is connected to the self-locking seat, and is connected to the parallel port of control panel; Be connected capacitor C 401 and C402 between power supply VCC and the public ground; The normally opened contact of socket J400, U400 and electromagnetic relay K400 constitute the civil power loop of ringing a bell; The coil pin of K400 is connected to the collector that VCC, another are connected to NPN type triode Q400, two coil pin of K400 damper diode D400 in parallel, the emitter of Q400 connects the collector of common, base stage connection positive-negative-positive triode Q401, be connected to VCC behind the emitter resistance in series R401 of Q401, be connected to a pin of certain parallel port of U100 on the control panel behind the base series resistor R402 of Q401.Component parameters is selected: U400 selectively operating voltage is the magneto bell of 220V; It is the 5V direct current that K400 selects operating voltage such as PA1A-5V or DSP1A-5V, nominal load 5A 250VAC, contact open type electromagnetic relay; Q400, Q401 can select 8050; D400, D401 can select 1N4001; R401～R403 can select the 1/4W metalfilmresistor to be respectively 2K, 300 Europe and 1K; C401 can select the 16V/100uF alminium electrolytic condenser; C402 can select the ceramic disc capacitor of 0.1uF; Y400 can select the passive crystal oscillator of 32.768KHz; U401 can select DS1302; BT400 can select the 3.6V lithium battery.The pin that is connected to control panel U100 parallel port can freely be selected, as long as this pin is not taken by other circuit.

Among Fig. 6, power connector end J200 connects power panel+5V and common, + 5V connects VCC, be connected capacitor C 200 between VCC and the public ground, the two ends of C201 and potentiometer R200, the center-side of R200 is connected to the contrast adjustment end VEE of LCD display D200, the power end VCC of D200 is connected power supply VCC and common respectively with VSS, the control end RS of D200, R/W, E and data terminal DB0～DB7 are connected respectively to some pin of U100 parallel port on the control panel, the LED+ serial resistance R201 of D200 is connected to power supply VCC, the LED-of D200 is connected to common, the series circuit of resistance R 201 and diode D201 is connected to the emitter of VCC and positive-negative-positive triode Q200, the collector of Q200 connects common, base series resistor R203 is connected to the output terminal of the C unit of Unit 4 two input nand gate integrated circuit U201, the input end of the C unit of U201 is connected to certain two pin of U100 parallel port on the control panel, the power supply of integrated infrared decoding integrated circuit U200 and ground pin connect VCC and common respectively, the decoded signal output pin connects two input ends of the A unit of U201, the output terminal of the A unit of U201 connects two input ends of the B unit of U201, and the output terminal of the B unit of U201 connects certain pin of U100 parallel port on the control panel.Component parameters is selected: D200 can select the LCD1602 LCD; R200 can select 5K precision resistor 3296/502; R201 can select 1/2W 10 Europe; R202 can select 1/2W/33 Europe; U200 can select SM0038; C200 can select the 16V/220uF alminium electrolytic condenser; C201 can select the 0.1uF ceramic disc capacitor; Q200 can select 8550; R203 can select 1/4W 1K; U201 can select 74LS00.The pin that is connected to control panel U100 parallel port can freely be selected, as long as this pin is not taken by other circuit.

Among Fig. 7, on the power panel+5V is connected to the VCC of this expansion board, to motor power supply+12V or+7.2V is connected to VDD, common is connected with the ground end of power panel, be connected capacitor C 401 between VCC and the public ground, C403, be connected capacitor C 400 between VDD and the public ground, C402, between VCC and public ground, be connected circuit that resistance R 400～R411 and infraluminescence pipe D400～D411 respectively connect in twos totally 12 tunnel, wherein 9 the tunnel are used to track, other 2 the tunnel is crashproof before and after being used for, the infrared illumination that last road is used to test the speed, the anode of infrared receiving tube D412～D423 connects common, negative electrode is connected respectively to 12 pins of pull-up resistor R415 and R416, R415, the common port of R416 is connected to power supply VCC, the negative electrode of D412～D423 also is connected respectively to the in-phase input end of Unit 4 two input voltage comparer U400～U402 by plug socket, 9 tunnel center taps that are connected to potentiometer R412 that are used to track in 12 road inverting inputs of U400～U402, other 2 the tunnel are used for the center tap of the crashproof connection R414 in front and back, the center tap that is connected to R413 that last road is used to test the speed, the two ends of R 412～R414 connect VCC and common respectively, and 12 road output terminals of U400～U402 are connected to certain 12 pin of the parallel port of U100 on the control panel; Certain pin, collector serial resistance R421 that the emitter connection common of NPN type triode Q404, base series resistor R417 are connected to the parallel port of U100 on the control panel are connected to VDD, the collector of Q404 is also connected to the base stage of NPN type triode Q400 and positive-negative-positive triode Q408, the collector of Q400 connects the emitter of VDD, emitter connection Q408, the collector of Q408 connects common, parallel diode D424 between the collector and emitter of Q400, parallel diode D428 between the collector and emitter of Q408; Certain pin, collector serial resistance R422 that the emitter connection common of NPN type triode Q405, base series resistor R418 are connected to the parallel port of U100 on the control panel are connected to VDD, the collector of Q405 is also connected to the base stage of NPN type triode Q401 and positive-negative-positive triode Q409, the collector of Q401 connects the emitter of VDD, emitter connection Q409, the collector of Q409 connects common, parallel diode D425 between the collector and emitter of Q401, parallel diode D429 between the collector and emitter of Q409; The two ends of direct current generator MG400 are connected respectively to the emitter of Q400 and Q401; Certain pin, collector serial resistance R423 that the emitter connection common of NPN type triode Q406, base series resistor R419 are connected to the parallel port of U100 on the control panel are connected to VDD, the collector of Q406 is also connected to the base stage of NPN type triode Q402 and positive-negative-positive triode Q410, the collector of Q402 connects the emitter of VDD, emitter connection Q410, the collector of Q410 connects common, parallel diode D426 between the collector and emitter of Q402, parallel diode D430 between the collector and emitter of Q410; Certain pin, collector serial resistance R424 that the emitter connection common of NPN type triode Q407, base series resistor R420 are connected to the parallel port of U100 on the control panel are connected to VDD, the collector of Q407 is also connected to the base stage of NPN type triode Q403 and positive-negative-positive triode Q411, the collector of Q403 connects the emitter of VDD, emitter connection Q411, the collector of Q411 connects common, parallel diode D427 between the collector and emitter of Q403, parallel diode D431 between the collector and emitter of Q411; The two ends of direct current generator MG401 are connected respectively to the emitter of Q402 and Q403.Component parameters is selected: resistance can be selected the 1/4W metalfilmresistor; It is 3mm or 5mm pipe that the infraluminescence pipe can be selected diameter, and infrared receiving tube can select diameter to be 3mm or 5mm pipe, and be corresponding with the power valve diameter; Voltage comparator can be selected LM324; Potentiometer can be selected 3296/103 precision resistor; Damper diode can be selected 1N4001; The drive axle circuit (Q400～Q403, Q408～Q411) can select 8050/8550 pair of pipe or TIP147/TIP142 to pipe according to the power of motor, Q404～Q407 can select 9013; Direct current generator MG400, MG401 can select corresponding model according to the voltage of VDD.The pin that is connected to control panel U100 parallel port can freely be selected, as long as this pin is not taken by other circuit.

The utility model can also comprise student's other experimental circuit according to the needs design in fields such as daily life or commercial production.

Claims

1. the single chip computer experiment case comprises power supply circuit board, control circuit board and expander board, it is characterized in that: also comprise common tool and electronic package; Described power supply circuit board is an independently circuit board, the centre tapped 15V alternating voltage of input tape, output ± 12V ,+5V ,+1.25V～+ the 12V adjustable dc voltage; Described control circuit board is an independently circuit board, comprise and the resetting and the crystal oscillator accessory circuit of the interface of power supply circuit board, RS-232/TTL level converter circuit, key circuit, nixie display circuit, buzzer circuit, MCU, except that MCU reset and the crystal oscillator accessory circuit, can realize disconnecting or being connected by toggle switch between other circuit on the control circuit board and the parallel port of MCU, the parallel port of MCU can independently fully be expanded; Described expander board comprise with the interface of power panel, with the interface of control circuit board and the circuit of forming by electronic component: described common tool is multimeter, electric soldering iron, bottle opener, rosin, solder stick, tin-absorbing pump; Described electronic package is resistance, electric capacity, diode, triode, integrated circuit, digital display tube, LCD display module, integrated infrared receiving module, dc micro-motor, lead.

2. single chip computer experiment case according to claim 1, it is characterized in that, described power supply circuit board, control circuit board and expander board respectively are provided with four pilot holes, and 24 nadels are arranged on the base plate, and the lead by band self-locking seat between each circuit board connects.

3. single chip computer experiment case according to claim 1 is characterized in that, the circuit that electronic component is formed on the described expansion board can be by the timing that integrated circuit of clock DS1302, electromagnetic relay, electric bell and accessory circuit the are formed experimental circuit of ringing a bell.

4. single chip computer experiment case according to claim 1, it is characterized in that infrared decoding, the experimental circuit of encoding that the circuit that electronic component is formed on the described expansion board can be made up of LCD LCD1602, integrated infrared receiving module SM0038, infrared transmitting tube, Sheffer stroke gate integrated circuit 74LS00 and accessory circuit.

5. single chip computer experiment case according to claim 1, it is characterized in that the thermostatic control experimental circuit that the circuit that electronic component is formed on the described expansion board can be made up of digital temperature sensor DS18B20, power resistor, LCD LCD1602 and accessory circuit.

6. single chip computer experiment case according to claim 1, it is characterized in that the intelligent carriage experimental circuit that the circuit that electronic component is formed on the described expansion board can be made up of infrared transmitting tube, infrared receiving tube, voltage comparator, pliotron, direct current generator and accessory circuit.