CN213518867U - Singlechip development board - Google Patents

Abstract

The utility model discloses a singlechip development board belongs to development board field, including circuit substrate, protection top shell, fixed bolt post and hex bolts, the circuit setting is on circuit substrate, and four fixed bolt posts are fixed on circuit substrate's four corners, and protection top shell setting is at the top of fixed bolt post to with the hex bolts fixing, state protection top shell and set up to the transparent plastic protective layer. The common basic circuit function that has included 51 singlechips for the student is on class and the real standard has been sufficient completely, while is rationally distributed, overall structure is less, satisfy the demand to the teaching, protect some circuit devices that do not need direct contact on the circuit board through setting up the protection topshell, in order to avoid student's hand to touch, can break the circuit board off with the fingers and thumb, the life of development board has been shortened, after the expected student used 5 years, bad board rate just has 5%, fixed 12864 LCD screen interface and 1602 LCD screen interface have been set up simultaneously, can effectively avoid the student to insert wrong display screen, the condition of burning out.

Description

Singlechip development board

Technical Field

The utility model relates to a development board field especially relates to a singlechip development board.

Background

The single chip microcomputer learning boards on the market are various, or the single chip microcomputer learning boards have too many functions, complex circuits and too high price, and cannot be accepted by students, or the single chip microcomputer learning boards have too few functions, are just the minimum system of the single chip microcomputer, cannot learn anything after being held by hands, and have great obstruction to the learning interest of the students. According to the teaching experience and the practical situation of students, a set of single-chip learning board is developed.

In the existing whole class student learning process or practical training, the damaged number of the development board is very large, the development board is damaged, devices of 1 and the development board are exposed, the students are bored to swing the devices in class, the devices fall off, and 2, when the modules are plugged, the display screen is easily burnt out, so that a single-chip development board which is simple and not easy to damage needs to be designed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a singlechip development board solves the technical problem that current singlechip development board perhaps instructs the process to damage easily at class in fact.

The utility model provides a singlechip development board, includes circuit substrate, protection top shell, fixed bolt post and hex bolts, and the circuit setting is on circuit substrate, and four fixed bolt posts are fixed on circuit substrate's four corners, the top shell setting of protection is at the top of fixed bolt post to with the hex bolts fixed, the protection top shell sets up to the transparent plastic protective layer.

Further, circuit substrate's both sides set up to the IO interface, and the IO interface includes wiring pin header, 12864 LCD screen interface and 1602 LCD screen interface, and wiring pin header (10) set up on circuit substrate's right side limit, and the protection top shell of top leaks empty the setting, 12864 LCD screen interface and 1602 LCD screen interface all set up on circuit substrate's left side edge, it separates to be provided with protection top shell chimb between 12864 LCD screen interface and the 1602 LCD screen interface, the side of 1602 LCD screen interface is provided with the protruding card limit, prescribes a limit to the width of 1602 LCD screen interface.

Furthermore, the left side and the right side of the side edge of the front end of the circuit substrate are provided with a temperature sensor and an infrared receiving head, the inner sides of the temperature sensor and the infrared receiving head are provided with a water lamp, and the temperature sensor, the infrared receiving head and the water lamp are all arranged at the bottom of the protective top shell.

Furthermore, the inboard of flowing water lamp is provided with single charactron and four charactrons, the centre of circuit substrate is provided with the dot matrix display screen, dot matrix display screen bottom is provided with control circuit's control chip, and single charactron, four charactrons and dot matrix display screen all set up the bottom at the protection top shell.

Furthermore, the upper protection top shell of the circuit substrate is provided with independent keys and matrix keyboard keys, and is of a hollow structure.

Furthermore, an RS232 downloading interface, a USB-to-serial port downloading interface and an ISP downloading interface are sequentially arranged on the right side of the independent key, and the RS232 downloading interface, the USB-to-serial port downloading interface and the ISP downloading interface are all arranged at the bottom of the protective top shell.

Furthermore, a power circuit is arranged on the circuit substrate and connected with the control circuit.

The utility model adopts the above technical scheme, the utility model discloses following technological effect has:

the utility model discloses a 51 common basic circuit function of singlechip, a be used for the student to class and instruct that the reality has been enough completely, while rationally distributed, overall structure is less, satisfy the demand to the teaching, can get the volume overall arrangement littleer simultaneously again, better depositing, some circuit devices that do not need direct contact on to the circuit board through setting up the protection top shell protect, in order to avoid student's hand to contact, can break the circuit board off with the fingers and thumb, the life of development board has been shortened, circuit board generally used the back of learning of 2-3 in the past, bad board rate has reached more than 25%, seriously influence the teaching, use the scheme of this application, after the expected student uses 5 years, bad board rate just has 5%, fixed 12864 LCD screen interface and 1602 LCD screen interface have been set up simultaneously, can effectively avoid the student to insert wrong display screen, the condition of burning out.

Drawings

Fig. 1 is a side view of the development board of the present invention.

Fig. 2 is a top view of the development board of the present invention.

Fig. 3 is a schematic diagram of the main control circuit of the present invention.

Fig. 4 is a schematic diagram of the power circuit of the present invention.

Fig. 5 is a schematic diagram of a single nixie tube circuit according to the present invention.

Fig. 6 is a schematic diagram of the eight-digit nixie tube circuit of the present invention.

Fig. 7 is a schematic diagram of the matrix keyboard of the present invention.

Fig. 8 is a schematic diagram of the dot matrix circuit of the present invention.

Fig. 9 is a schematic diagram of the interface circuit of the liquid crystal display 12864 of the present invention.

Fig. 10 is a schematic diagram of the interface circuit of the liquid crystal display 1602 according to the present invention.

Fig. 11 is a schematic circuit diagram of the infrared receiving head of the present invention.

Fig. 12 is a schematic diagram of the flowing water lamp circuit of the present invention.

Fig. 13 is a schematic diagram of the temperature sensor circuit of the present invention.

Fig. 14 is a schematic diagram of the USB-to-serial download interface circuit of the present invention.

Fig. 15 is a schematic diagram of the RS232 download interface circuit of the present invention.

Fig. 16 is a schematic diagram of an ISP download interface circuit according to the present invention.

Reference numbers in the figures: 1-a circuit substrate; 2-protecting the top shell; 3-fixing the bolt column; 4-hexagonal screw; 5-a temperature sensor; 6-infrared receiving head; 7-a water lamp; 8-single nixie tube; 9-four nixie tubes; 10-wiring pin header; 11-12864 LCD screen interface; 12-1602 LCD screen interface; 13-protruding clamping edges; 14-dot matrix display screen; 15-ISP download interface; 16-USB to serial port download interface; 17-RS232 download interface; 18-independent keys; 19-matrix keyboard keys.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, preferred embodiments are described in detail. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

A single chip microcomputer development board is shown in figures 1-2 and comprises a circuit substrate 1, a protection top shell 2, fixed bolt columns 3 and hexagon screws 4, wherein a circuit is arranged on the circuit substrate 1, the four fixed bolt columns 3 are fixed on four corners of the circuit substrate 1, the protection top shell 2 is arranged at the tops of the fixed bolt columns 3 and fixed through the hexagon screws 4, and the protection top shell 2 is a transparent plastic protection layer. The protective top case 2 may also be transparent tempered glass. The use of the hexagon screws 4 prevents students from being able to dismount at will, and the circuit substrate 1 is the circuit board of the development board with better protection effect.

In the embodiment of the utility model, as shown in fig. 2, circuit substrate 1's both sides set up to the IO interface, and the IO interface includes wiring pin header 10, 12864 LCD screen interface 11 and 1602 LCD screen interface 12, and wiring pin header 10 sets up on circuit substrate 1's right side edge, and the protection top shell 2 of top leaks empty the setting, 12864 LCD screen interface 11 and 1602 LCD screen interface 12 all set up on circuit substrate 1's left side edge, it separates to be provided with protection top shell 2 chimb between 12864 LCD screen interface 11 and the 1602 LCD screen interface 12, 1602 LCD screen interface 12's side is provided with protrusion card limit 13, prescribes a limit to 1602 LCD screen interface 12's width.

As shown in fig. 9 and 10, the 12864 lcd interface circuit and the 1602 lcd interface circuit, the 12864 lcd can not only display figures and chinese characters, but also display simple figures, the lcd scheme formed by the module is much simpler than the graphic dot matrix lcd module of the same type, no matter the hardware circuit structure or the display program, and the price of the module is slightly lower than that of the graphic lcd module of the same dot matrix. The circuit and a 1602 liquid crystal screen are directly multiplexed with a P0 port, and a 3-pin external trimming resistor is convenient to adjust the contrast of different liquid crystal screens. For circuits that need to display english and numbers, 1602 lcd is the best choice. Compared with a digital tube, the 1602 liquid crystal screen can display more contents although the brightness is not good, and the use of the liquid crystal screen is more advanced.

Considering that the 1602 LCD and the nixie tube circuit are rarely used simultaneously, the 1602 LCD is in the form of movable pins at the installation position, and the position is overlapped with the nixie tube, when the 1602 LCD is used, the 1602 LCD can be used only by inserting the 1602 LCD; when the nixie tube is to be used, the 1602 liquid crystal screen is pulled down, so that the normal use of the nixie tube is not hindered. Considering that the 1602 LCD screen and the 12864 LCD screen are rarely used simultaneously, the circuit and the 12864 LCD screen are directly multiplexed with a P0 port, and a 3-pin external trimming resistor is convenient to adjust the contrast of different LCD screens. In student's daily study, what burn out most easily is the display screen, consequently sets up fixed insertion jack and socket, reduces the condition of socket, the condition that few display screen that can be great burns out. According to practical teaching, a common development board, a class of 45 students, can lack 5-7 display screens in the course of class. The wiring pin header 10 can be used by other external modules or for controlling collection.

In the embodiment of the utility model provides an, as shown in fig. 2, the front end side left and right sides of circuit substrate 1 is provided with temperature sensor 5 and infrared receiving head 6, temperature sensor 5 and infrared receiving head 6's inboard is provided with flowing water lamp 7, temperature sensor 5, infrared receiving head 6 and flowing water lamp 7 all set up the bottom at protection top shell 2. For example, fig. 13 is a schematic circuit diagram of a temperature sensor, fig. 11 is a schematic circuit diagram of an infrared receiving head, which is arranged at the side edge and can better receive infrared signals, meanwhile, the temperature sensor is 18B20, the probe is transversely arranged outwards and can better detect temperature, and the bottom of the infrared receiving head is not contacted with a circuit substrate.

The dot matrix circuit is prepared for dot matrix display of Chinese characters and graphics, and as long as the principle of dot matrix display is understood, the large dot matrix display principle is easy to understand, and only one 8-by-8 dot matrix is used. 8H 8 multiplexing P0 port by IC1 and IC 2.

DS18B20 is a commonly used digital temperature sensor, and the output of it is a digital signal, and has the characteristics of small volume, low hardware overhead, strong anti-interference capability and high precision. The DS18B20 digital temperature sensor is convenient to wire, can be applied to various occasions after being packaged, is connected with a single chip microcomputer by adopting a single wire system, reduces external hardware circuits, and has the characteristics of low cost and easy use. Is a temperature sensor supporting a one-wire bus interface. One-wire buses are unique and economical. The output data of 18B20 is connected to the P2.0 interface of the single chip microcomputer, and a digital display temperature detection circuit can be manufactured by matching with a nixie tube or a 1602 liquid crystal screen circuit.

The infrared receiving circuit adopts VS1838B as receiving head, the circuit is simple and general, and can use the remote controller of common TV set as transmitting source signal. Therefore, the study is closer to the ordinary life.

In the embodiment of the utility model provides an in, as shown in fig. 2, the inboard of flowing water lamp 7 is provided with single charactron 8 and four charactrons 9, circuit substrate 1's centre is provided with dot matrix display screen 14, dot matrix display screen 14 bottom is provided with control circuit's control chip, and single charactron 8, four charactrons 9 and dot matrix display screen 14 all set up the bottom at protection top shell 2.

As shown in fig. 6-7, the use of a single nixie tube is to learn the transition from the single-chip microcomputer just entering the door to displaying useful numbers. The common anode control is carried out on the nixie tube U1 by a triode Q1. When this circuit is not used, the circuit is turned off and does not affect other circuits as long as the base control terminal P2.1 of Q1 is set to a high level.

The eight-bit nixie tube circuit multiplexes the P0 port with other circuits through a plurality of 74HC 573U 2-U5, and enables students to understand the utilization of circuit ports and master the methods of dynamic scanning and static scanning through the circuit learning.

And lighting an LED, and then carrying out programming of a water lamp, wherein the single-chip microcomputer program design is the first one contacted by a person entering the door. The circuit uses a P1 port, shares one interface with a matrix keyboard, and switches the circuit by using a jumper switch CZ5 in order to prevent the mutual interference of the two circuits. When the flowing lamp circuit is to be used, CZ5 is switched on, providing a pull-up resistance for exclusion PAI 2. When the running water is installed, LEDs with more than two colors are preferably installed at intervals, and when the running water effect is displayed, the running water effect is better. The LED of the water lamp adopts a phi 3mm tube, and a larger LED is not needed because the tube is only used for indication and not used for illumination.

In the embodiment of the present invention, as shown in fig. 3 to 16, the top protection top case 2 provided with the independent keys 18 and the matrix keyboard keys 19 at the rear end of the circuit substrate 1 is set to be a hollow structure. The right side of the independent key 18 is sequentially provided with an RS232 download interface 17, a USB-to-serial port download interface 16 and an ISP download interface 15, and the RS232 download interface 17, the USB-to-serial port download interface 16 and the ISP download interface 15 are all arranged at the bottom of the protective top shell 2. The data are downloaded to a singlechip learning board through three modes of IPS, USB and RS232 interfaces, the ISP interface is suitable for real-time monitoring of a circuit, if a computer for programming has the RS232 interface, the RS232 interface can be directly used for data interaction, a driver is not needed, if the computer for programming does not have the RS232 interface, a driver of PL2303 is needed to be installed on the computer for programming, and a PL2303 integrated circuit of a USB-to-serial port is used for data transmission. The three data downloading modes are different from the external input mode, and are finally written into the singlechip through two ports of P3.0(RXT) and P3.1 (TXD). The size of the study plate is 18.3 x 12 cm.

Because the port of singlechip is less, for the effect of full play singlechip, except using independent button, still use the matrix keyboard, the advantage of this circuit is: occupies less I/O port resources. The disadvantages are that: the key condition must be scanned and detected, the procedure is complex, and the occupied time is more. The matrix keyboard and the water lamp circuit share a P1 port. The keys used by the keyboard are 1.2 × 1.2cm large keys, which are more air-exposed than 0.6 × 0.6cm keys used by development boards on the market and are more convenient to use.

In the embodiment of the present invention, as shown in fig. 3, the circuit substrate 1 is further provided with a power circuit, and the power circuit is connected to the control circuit. The main control module circuit of the single chip microcomputer uses 89C52 as a main control chip. Because the 51-series single chip microcomputer is relatively early in appearance, the technology is quite mature, the instruction is simple, the learning is easy, the peripheral circuit is simple, the hardware design is convenient, the I/O port is simple to operate, the directional register is not provided, the resource is rich, the general design is sufficient, the price is low, the purchase is easy, the data is rich and easy to find, the program programming is simple, the advantages are high cost performance, a plurality of mature routines can be referred to on the network, the peripheral circuit is simple, and the chip can meet the general use function. For the expanded use of convenient circuit, be equipped with the expansion interface circuit on main control chip's both sides, the interface adopts 2.54 mm's public first contact pin, utilizes 2.54mm dupont line can be convenient provide this study board's information to external circuit, uses the minimum system that just regards the study board as a singlechip to use.

The circuits of the development board are all existing circuits, after the circuits are drawn according to the principle diagrams of figures 3-16, the circuits are converted into the drawing of a PCB, when the PCB is wired, the layout is carried out according to the structure of figure 2, then components are welded after the printing board, and the protection top shell is fixed.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A singlechip development board which is characterized in that: including circuit substrate (1), protection top shell (2), fixed bolt post (3) and hex bolts (4), the circuit setting is on circuit substrate (1), and four fixed bolt posts (3) are fixed on the four corners of circuit substrate (1), protection top shell (2) set up the top at fixed bolt post (3) to it is fixed with hex bolts (4), protection top shell (2) set up to the transparent plastic protective layer.

2. The single chip microcomputer development board according to claim 1, characterized in that: the utility model discloses a circuit board, including circuit substrate (1), IO interface, protection top shell (2) hourglass empty setting of top, 12864 LCD screen interface (11) and 1602 LCD screen interface (12), the both sides of circuit substrate (1) set up to the IO interface including wiring row needle (10), 12864 LCD screen interface (11) and 1602 LCD screen interface (12), wiring row needle (10) set up on the right side of circuit substrate (1), and the protection top shell (2) hourglass empty setting of top, 12864 LCD screen interface (11) and 1602 LCD screen interface (12) all set up on the left side edge of circuit substrate (1), it separates to be provided with protection top shell (2) chimb between 12864 LCD screen interface (11) and 1602 LCD screen interface (12), the side of 1602 LCD screen interface (12) is provided with protruding card limit (13), prescribes a limit to the width of.

3. The single chip microcomputer development board according to claim 2, characterized in that: the circuit board is characterized in that temperature sensors (5) and infrared receiving heads (6) are arranged on the left side and the right side of the side edge of the front end of the circuit board (1), water flowing lamps (7) are arranged on the inner sides of the temperature sensors (5) and the infrared receiving heads (6), and the temperature sensors (5), the infrared receiving heads (6) and the water flowing lamps (7) are all arranged at the bottom of the protective top shell (2).

4. The single chip microcomputer development board according to claim 3, characterized in that: the inboard of flowing water lamp (7) is provided with single charactron (8) and four charactron (9), the centre of circuit substrate (1) is provided with dot matrix display screen (14), dot matrix display screen (14) bottom is provided with control circuit's control chip, and single charactron (8), four charactron (9) and dot matrix display screen (14) all set up the bottom in protection top shell (2).

5. The single chip microcomputer development board according to claim 4, characterized in that: the upper protection top shell (2) of the circuit substrate (1) is provided with independent keys (18) and matrix keyboard keys (19) at the rear end and is of a hollow structure.

6. The single chip microcomputer development board according to claim 5, characterized in that: and an RS232 downloading interface (17), a USB-to-serial port downloading interface (16) and an ISP downloading interface (15) are sequentially arranged on the right side of the independent key (18), and the RS232 downloading interface (17), the USB-to-serial port downloading interface (16) and the ISP downloading interface (15) are all arranged at the bottom of the protective top shell (2).

7. The single chip microcomputer development board according to claim 6, characterized in that: the circuit substrate (1) is also provided with a power circuit, and the power circuit is connected with the control circuit.

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