CN205140340U - Singlechip development board based on pocket laboratory theory - Google Patents

Abstract

The utility model discloses a singlechip development board based on pocket laboratory theory, including the singlechip, E2PROM memory circuit, real -time clock module, serial port communication, ADDA module, keyboard circuit, DC motor drive circuit, stepping motor drive circuit, temperature sensor, buzzer, clock charactron, heat are released electric module interface circuit, infrared receiving terminal, photosensitive sensor, OLED interface circuit, LED serial port communication 0, full -color LED and are connected with the singlechip respectively. Use of surface pastes the dress technique, and whole device adopts the paster chip as far as possible to furtherly reduces to develop the volume of board, improves its stability and portable.

Description

A kind of microcomputer development plate based on pocket laboratory theory

Technical field

The utility model belongs to singlechip technology field, designs a kind of microcomputer development plate based on pocket laboratory theory.

Background technology

Along with the development of microelectric technique, not only the function of chip and stability promote to some extent, and its volume and pin-pitch also reduce further.In addition, PCB (printed circuit board) technology also develops rapidly, and in PCB, the spacing of two wires can be as small as 6mil (mil), even less.These two kinds of technology make the circuit board designed relative to traditional experiment case, and when completing identical function, volume reduces greatly, thus make it become smaller and more exquisite, portable.In addition, these two kinds of technology have also impelled the development of SMT (surface mounting technology) in microelectronic packaging technology, and this makes the circuit board designed have more stability.

There are 51 a large amount of microcomputer development plates on the market, although the significantly reduction existing relative to its volume of traditional experiment case of these development boards, also the certain portability of tool, but the development board contact pin that adopts being control core with 51 single-chip microcomputers on the market encapsulates more, and in order to learn concrete module targetedly, each module often all can the row's of extending out needle interface, to be interconnected by wire and single-chip microcomputer, the microcomputer development plate of this structure arranges pin in a large number owing to existing, therefore the finger of user may be stabbed when misoperation, and stability seems slightly poor relative to the microcomputer development plate that paster encapsulates.In addition, the device of contact pin encapsulation is comparatively large relative to paster encapsulation due to volume, therefore causes the volume of microcomputer development plate small and exquisite not enough, portable.

Utility model content

The purpose of this utility model is to provide a kind of microcomputer development plate based on pocket laboratory theory, and compact structure is portable.

The technical scheme that the utility model adopts, a kind of microcomputer development plate based on pocket laboratory theory, comprise single-chip microcomputer, E2PROM memory circuit, real-time clock module, serial communication, AD/DA module, keyboard circuit, direct current motor drive circuit, stepper motor driving circuit, temperature sensor, hummer, clock charactron, pyroelectricity module interface circuit, infrared receiving terminal, light sensor, OLED interface circuit, LED running lamp, all-colour LED are connected with single-chip microcomputer respectively.

Further, described single-chip microcomputer adopts STC89C52RC single-chip microcomputer, and what controller adopted is encapsulated as LQFP-44.

Further, described real-time clock module (3) adopts DS1307 real-time timepiece chip+standby power supply CR1220 lithium battery.

Further, described serial communication adopts CH340T chip.

Further, described AD/DA module chip is PCF8591.

Further, described temperature sensor is DS18B20 model.

Further, stepper motor driving circuit driving chip adopts ULN2003.

The beneficial effects of the utility model are, surface mounting technology, and whole device adopts patch chip as much as possible, to reduce the volume of development board further, improve its stability and portability.In the design peripheral module is carried out organic assembling, but not as the microcomputer development plate on market, each functional module is carried out independently piling up.Therefore in use without the need to adopting outer lead to interconnect to functional module and single-chip microcomputer again, thus the failure of an experiment phenomenon that effectively prevent because wire problem causes or the phenomenon causing practice to continue because wire loses.The chip major part adopted in design adopts paster encapsulation, thus while greatly reducing experimental provision volume, also effectively improves the stability of device itself.Be suitable for the student group begining to learn single-chip microcomputer, its small volume, and each port of single-chip microcomputer and peripheral components complete interconnection, power supply and download program are all connected with computer by data line by the same USB port of this device, thus easy to connect, the volume that device is less in addition, also it is made very easily to carry, facilitate 51 single-chip learning persons to test whenever and wherever possible, thus greatly can increase its chance starting to put into practice, cultivate its innovative thinking and raising and start the ability of practice.

Accompanying drawing explanation

Fig. 1 is the structural representation of microcomputer development plate.

Fig. 2 is the structural drawing of single-chip microcomputer.

Fig. 3 is system clock circuit figure.

Fig. 4 is serial communication circuit figure.

Fig. 5 is E2PROM memory circuit figure.

Fig. 6 is AD/DA module interface circuit figure.

Fig. 7 is interface circuit of temperature sensor.

Fig. 8 is buzzer interface circuit.

Fig. 9 is direct current motor drive circuit.

In Fig. 1,1. single-chip microcomputer, 2.E2PROM memory circuit, 3. real-time clock module, 4. serial communication, 5.AD/DA module, 6. keyboard circuit, 7. direct current motor drive circuit, 8. stepper motor driving circuit, 9. temperature sensor, 10. hummer, 11. clock charactrons, 12. pyroelectricity module interface circuits, 13. infrared receiving terminals, 14. light sensors, 15.OLED interface circuit, 16.LED running lamp, 17. all-colour LEDs.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.

Based on the microcomputer development plate of pocket laboratory theory, structure as shown in Figure 1.Comprise single-chip microcomputer 1, E2PROM memory circuit 2, real-time clock module 3, serial communication 4, AD/DA module 5, keyboard circuit 6, direct current motor drive circuit 7, stepper motor driving circuit 8, temperature sensor 9, hummer 10, clock charactron 11, pyroelectricity module interface circuit 12, infrared receiving terminal 13, light sensor 14, OLED interface circuit 15, LED running lamp 16, all-colour LED 17 be connected with single-chip microcomputer 1 respectively.

Wherein, the structure of single-chip microcomputer 1 as shown in Figure 2, adopts STC89C52RC single-chip microcomputer, and what controller adopted is encapsulated as LQFP-44.

In the utility model, power circuit is provided by Type B USB female, and except providing power supply by this USB port to this device, the download of program, the communication of upper and lower machine data is also all completed by this mouth.When this device connects computer by USB data line, damage computer USB port for avoiding because institute's bringing onto load is overweight, this device has sealed in the insurance of 500mA self-recoverage in the middle of power circuit when designing, to protect this device and computer USB port.

System clock circuit, as shown in Figure 3, adopts doubleclocking oscillator, is respectively 12M and 11.0592M crystal oscillator.Clock can be chosen like a cork when testing by jumper cap, thus conveniently complete conventional Control release and serial communication experiment.

In order to download by the USB port on this device and complete the serial communication between upper and lower machine, this device have employed the conversion that CH340T chip realizes agreement, and serial communication 4 as shown in Figure 4.

Also comprise LED running lamp 16, have 8 0805 LED encapsulated, its direct interface, to single-chip microcomputer P1 mouth, can carry out parallel port operation, also can carry out bit manipulation, can complete the running lamp experiment of various pattern.These 8 LED carry out gating by a triode.

Development board is equipped with a slice clock chip DS1307, not only can carry out digital dock experiment by this chip, also by the operation of this chip by students IIC agreement.

E2PROM memory circuit, as Fig. 5, model is AT24C02, can will not wish that the data that power down is lost are put into wherein easily, thus realize non-volatile.This chip is identical with data line with the clock line of DS1307, can many device operations of training of students iic bus, is conducive to student and deeply grasps IIC agreement.

As shown in Figure 6, in order to carry out D/A switch and analog/digital conversion experiment, be configured with a slice AD/DA module 6, chip PCF8591, this port outside, except having connect a LED lamp, is also drawn, to facilitate by analog voltage control panel external equipment by analog output.Analog input end has 4, and AIN0 is connected to potentiometer, can provide analog voltage by regulator potentiometer to this chip.AIN1 is connected to photoresistance by a triode, thus can provide analog voltage by bright and dark light to this chip.Two-way input is outside in addition draws, and can connect other analog voltages or form Differential Input mode.

As shown in Figure 7, in order to can testing environment temperature, this device be also configured with DS18B20 temperature sensor 9, by this sensor, can make the operation of students one-wire bus protocol.This sensor and light sensor adopt symmetrical structure in layout, improve the aesthetic property of layout.

This device is equipped with the interface circuit of active buzzer 10, can complete the sounding experiments such as warning or electronic music, as shown in Figure 8.

As shown in Figure 9, in order to control DC micromotor, this device is configured with L9110 DC motor Driver chip 7, it can realize the forward and backward of DC micromotor easily and open, stop control, in order to can the turning to of indication motor, install forward and reverse pilot lamp additional at output terminal.

In order to principle of work and the control procedure that classmates can be allowed to grasp stepper motor, be also configured with miniature stepper motor driving circuit 8, driving chip adopts ULN2003.

In order to increase the interest of this device, improving the interest that student starts to put into practice, being equipped with a common anode full-color LED lamp 17, it can be made to send by software programming and dazzle color radiance.

Key circuit 6 be six independently button done external input signal, the external interrupt of single-chip microcomputer that had two to receive in this six press keys, therefore these two buttons can be utilized to produce interrupting input signal, other four buttons are received on the common I/O port of single-chip microcomputer respectively, by this six press keys, can make student that what be understood is mechanical shaking, how to eliminate shake, how to utilize button to single-chip microcomputer issue an order.

In order to the principle that students can be allowed to grasp the dynamic and static display of charactron and dynamic scan, this device is equipped with the quaternity common anode clock charactron 11 of 0.28 inch, namely facilitate the code displaying principle of students data pipe, be also convenient to design beautiful digital dock.

In order to show word, curve and picture, this device is also configured with the OLED display screen of a piece 0.96 inch.This screen is small and exquisite and interface simple, and by this screen, student can not only grasp SPI protocol well, can also design more complicated display system with this screen.Though this screen volume is little, there is the resolution identical with LCD12864 module.This screen is for LCD module, and it can autoluminescence, and has abundant operational order, can realize upper and lower, left and right, oblique angle roll screen and highlight display, mirror shows mutually, plurality of display modes and the control mode such as region manipulation, great exploitation potential for its.

In order to enrich function and the exploitability of this device further, this device is also configured with one piece of VS1838B infrared receiving terminal 13 and pyroelectricity module interface circuit 12 respectively, thus can be controlled some resources on this device by outside Infrared remote controller.Whether pyroelectricity module has human body around by detecting, and produces corresponding control signal, to reach the object controlling this device resource.

For the ease of carrying out secondary development on the apparatus, the P0/P1/P2/P3 mouth of control core STC89C52RC single-chip microcomputer can all outsidely be drawn.

The PCB surface that this device adopts is long-pending only has 10cm*6.18cm, has portability, why can be all so small and exquisite by this apparatus design, exactly because microelectronic packaging technology makes chip more miniaturization, PCB technology makes away distance between centers of tracks less, thus when ensureing that experimental provision function is reduced not too much, efficiently reduce the area of pcb board material.

Each module and single-chip I/O mouth organically interconnect when designing by this device, and therefore there is not the problem by wire link block, so system stability is greatly improved, experiment success rate is also higher.In addition, all chips of this device all adopt paster to encapsulate, and this makes the compact of device exquisite, and relative to 51 microcomputer development plates on the market, it has portability.

This experimental provision major part chip is paster encapsulation, and its stability is relatively high, and device volume only has 10cm × 6.18cm × 2.2cm, PCB to be golden rectangle, has preferably geometry, and device can directly be held by one hand in use, and it is quite convenient to operate.Because of the volume that it is less, in the middle of the transparent boxes thus can putting into 11cm × 7cm × 2.5cm easily, and load pocket together with box, very easily carry.Coordinate notebook computer, other places of library, room for individual study, laboratory and campus can be arrived easily test, prominent have an idea time, as long as have computer and this device, idea realization can be converted into, thus effectively training student innovative thinking and raising the ability of practice can be started.

Claims (7)

1. the microcomputer development plate based on pocket laboratory theory, it is characterized in that, comprise single-chip microcomputer (1), E2PROM memory circuit (2), real-time clock module (3), serial communication (4), AD/DA module (5), keyboard circuit (6), direct current motor drive circuit (7), stepper motor driving circuit (8), temperature sensor (9), hummer (10), clock charactron (11), pyroelectricity module interface circuit (12), infrared receiving terminal (13), light sensor (14), OLED interface circuit (15), LED running lamp (16), all-colour LED (17) is connected with single-chip microcomputer (1) respectively.

2. a kind of microcomputer development plate based on pocket laboratory theory according to claim 1, is characterized in that, described single-chip microcomputer (1) adopts STC89C52RC single-chip microcomputer, and what controller adopted is encapsulated as LQFP-44.

3. a kind of microcomputer development plate based on pocket laboratory theory according to claim 1, is characterized in that, described real-time clock module (3) adopts DS1307 real-time timepiece chip+standby power supply CR1220 lithium battery.

4. a kind of microcomputer development plate based on pocket laboratory theory according to claim 1, is characterized in that, described serial communication (4) adopts CH340T chip.

5. a kind of microcomputer development plate based on pocket laboratory theory according to claim 1, is characterized in that, described AD/DA module (5) chip is PCF8591.

6. a kind of microcomputer development plate based on pocket laboratory theory according to claim 1, it is characterized in that, described temperature sensor (9) chip is DS18B20.

7. a kind of microcomputer development plate based on pocket laboratory theory according to claim 1, is characterized in that, stepper motor driving circuit (8) driving chip adopts ULN2003.