CN212208693U

CN212208693U - Singlechip pocket laboratory experiment teaching development board

Info

Publication number: CN212208693U
Application number: CN202021190614.8U
Authority: CN
Inventors: 邓鹏�
Original assignee: Jingchu University of Technology
Current assignee: Jingmen City Dream Exploring Technology Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2020-12-22
Anticipated expiration: 2030-06-23

Abstract

The utility model discloses a singlechip pocket laboratory experiment teaching development board, download circuit, EEPROM circuit, bee calling organ circuit, temperature sensor circuit, flowing water lamp circuit, charactron display circuit, LCD12864 circuit, LCD1602 circuit, AD DA circuit, independent keyboard circuit and matrix keyboard circuit including singlechip minimum system, serial communication circuit, USB procedure. The utility model discloses a development board uses USB interface power supply and download procedure, and convenient to use has adopted a large amount of paster components, has reduced the volume of development board, conveniently carries. In the design, an I/O port of the single chip microcomputer is led out, so that the expansion is convenient, and unlike an experimental box, a circuit is fixed and is not beneficial to the expansion, so that the learning interest and the enthusiasm of students are influenced. This design adopts the design mode of a large amount of paster components and modular circuit, has not only reduced the volume, has also improved stability. The student is convenient to carry during study, can be anytime and anywhere experiment.

Description

Singlechip pocket laboratory experiment teaching development board

Technical Field

The utility model relates to a singlechip technical field specifically is a singlechip pocket laboratory experiment teaching development board.

Background

With the rapid development of electronic technology, single-chip microcomputers are widely used in various fields such as production, life and the like. In colleges and universities, the single chip microcomputer course is a necessary course for professional purposes such as automation, communication engineering, electronic information engineering and the like. When students do experiments on the traditional single-chip microcomputer experimental box, the connecting lines on the experimental box are fixed, the expandability is not strong, the students are difficult to design circuits and write programs according to own ideas, some confirmatory experiments can only be completed according to the requirements of an experimental manual, and the practical ability and the innovation ability of the students cannot be improved. The traditional single chip microcomputer experiment box uses a large number of direct-plug elements, is poor in stability and large in size, and cannot be carried by students.

The novel single chip microcomputer experiment development board has the basic functions of a traditional experiment box, and students can also expand more complex experiment projects such as an electronic clock, a digital thermometer, a digital signal generator and the like of an LCD. The IO mouth of singlechip all draws with the pin gang on novel singlechip experiment development board, and the extension is convenient, and is small, uses android mobile phone line download program, convenient to carry.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a singlechip pocket laboratory experiment teaching development board, in order to solve the problem of proposing in the background art.

In order to realize the purpose, the utility model provides a following technical scheme:

the utility model provides a singlechip pocket laboratory experiment teaching development board, includes singlechip minimum system, serial communication circuit, USB program download circuit, EEPROM circuit, buzzer circuit, temperature sensor circuit, flowing water lamp circuit, charactron display circuit, LCD12864 circuit, LCD1602 circuit, AD/DA circuit, independent keyboard circuit and matrix keyboard circuit, singlechip minimum system respectively with serial communication circuit, USB program download circuit, EEPROM circuit, buzzer circuit, temperature sensor circuit, flowing water lamp circuit, charactron display circuit, LCD12864 circuit, LCD1602 circuit, AD/DA circuit, independent keyboard circuit and matrix keyboard circuit connection.

As a further aspect of the present invention: the single chip microcomputer in the single chip microcomputer minimum system adopts STC89C52RC and is packaged into DIP-40.

As a further aspect of the present invention: the serial port communication circuit adopts an RS232 chip, the serial port circuit and the USB program downloading circuit share TXD and RXD pins of the single chip microcomputer, and the serial port communication circuit and the USB program downloading circuit are selected by a jumper cap.

As a further aspect of the present invention: the buzzer circuit adopts a +5V active buzzer.

As a further aspect of the present invention: the temperature sensor circuit adopts a single-bus temperature sensor DS18B20 to measure temperature.

As a further aspect of the present invention: the running water lamp circuit consists of eight 0805 packaged surface-mounted light-emitting diodes.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a development board uses USB interface power supply and download procedure, and convenient to use has adopted a large amount of paster components, has reduced the volume of development board, conveniently carries. In the design, an I/O port of the single chip microcomputer is led out, so that the expansion is convenient, and unlike an experimental box, a circuit is fixed and is not beneficial to the expansion, so that the learning interest and the enthusiasm of students are influenced. This design adopts the design mode of a large amount of paster components and modular circuit, has not only reduced the volume, has also improved stability. The student is convenient to carry during study, can be anytime and anywhere experiment.

Drawings

Fig. 1 is a structural block diagram of a single-chip microcomputer pocket laboratory experiment teaching development board.

Fig. 2 is a circuit diagram of a minimum system of a single-chip microcomputer pocket laboratory experiment teaching development board.

Fig. 3 is a serial communication circuit diagram.

FIG. 4 is a circuit diagram of a USB program download circuit.

Fig. 5 is a circuit diagram of an EEPROM memory.

Fig. 6 is a circuit diagram of a buzzer.

Fig. 7 is a circuit diagram of a temperature sensor.

Fig. 8 is a circuit diagram of a water lamp.

Fig. 9 is a circuit diagram of a nixie tube display.

Fig. 10 is a circuit diagram of an LCD 12864.

Fig. 11 is a circuit diagram of an LCD 1602.

FIG. 12 is an AD/DA circuit diagram.

Fig. 13 is a diagram of a stand-alone keyboard.

Fig. 14 is a circuit diagram of a matrix keyboard.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: referring to fig. 1-14, the experimental teaching development board for the single-chip pocket laboratory comprises a single-chip minimum system, wherein the single-chip minimum system is respectively connected with a serial port communication circuit, a USB program downloading circuit, an EEPROM circuit, a buzzer circuit, a temperature sensor circuit, a running water lamp circuit, a nixie tube display circuit, an LCD12864 circuit, an LCD1602 circuit, an AD/DA circuit, an independent keyboard circuit and a matrix keyboard circuit, and the single-chip in the single-chip minimum system adopts STC89C52RC and is packaged into DIP-40. 32I/O ports of the single chip microcomputer are led out through the pin header and are separated from other circuits through jumper caps, and other circuits are conveniently expanded. The utility model discloses well power supply circuit input interface adopts the Micro USB interface of paster, except that providing +5V power to this device through this USB mouth, also has the function of singlechip program download and USB communication. A470 uF electrolytic capacitor is added at the input end of a power supply circuit of the development board, and a 600mA patch recoverable fuse is added, so that the singlechip is more stable in program downloading and operation processes.

As shown in FIG. 3, the serial communication circuit adopts an RS232 chip, and the serial circuit and the USB program downloading circuit share TXD and RXD pins of the singlechip and are selected by a jumper cap.

The USB program downloading circuit, as shown in fig. 4, can download the hex file generated by compiling into the single chip, and can also implement communication between the single chip and a PC or other devices.

The EEPROM circuit, as shown in FIG. 5, can be used to store some data that need to be saved when power is down, and the used memory chip is AT24C02, and the connection with the single chip uses IIC bus mode.

The buzzer circuit, as shown in fig. 6, adopts a +5V active buzzer, which can be used to realize alarm or send simple music.

The temperature sensor circuit, as shown in fig. 7, measures temperature using a single bus temperature sensor DS18B20, and the measurable temperature range is-55 ℃ to + 125 ℃.

The water lamp circuit, as shown in fig. 8, adopts eight 0805 packaged chip leds to reduce the size of the development board, so that students can control the leds by using the I/O port of the single chip to realize water lamps of various modes, and also can control one or more leds individually.

The nixie tube display circuit adopts 8 high-brightness 8-segment common-cathode nixie tubes for display as shown in fig. 9, static or dynamic display of the nixie tubes can be controlled by a single chip microcomputer, the nixie tubes are driven by an integrated digital chip 74LS573, and the drive by the digital chip 74LS573 has the advantages of reducing the volume of a circuit board, increasing the stability of a development board circuit and enabling students to master the operation method of the single chip microcomputer for a data latch.

As shown in fig. 10 and 11, the LCD12864 circuit and the LCD1602 circuit are respectively connected to corresponding pins of the LCD12864 and the LCD1602 displays on the development board, and when the development board is used, the LCD12864 and the LCD1602 displays are only required to be plugged into the corresponding pins, backlight of the displays can be adjusted by adjusting sliding resistors on the development board, and the data interfaces of the LCD12864 and the LCD1602 adopt a common mode, so that I/O ports are saved.

An AD/DA circuit, as shown in FIG. 12, the AD/DA circuit on the development board uses a chip-on-chip PCF8591, and the PCF8591 has 4-way serial A/D with 8 bits and 1-way D/A, which has the advantages of simple circuit, small volume and convenient A/D and D/A experiments for students.

Independent keyboard circuit and matrix keyboard circuit as shown in fig. 13 and 14, 4 independent keyboards can be used as external interrupt input, and also can be used as input of common I/O port. The matrix keyboard adopts a 16 x 16 matrix keyboard, which is helpful for students to master the working principle and the programming method of the matrix keyboard and is also helpful for students to master the method for key shaking removal.

In order to realize secondary development on the development board, the ports P0, P1, P2 and P3 are led out in an array in the minimum system circuit part of the singlechip.

Example 2: on the basis of embodiment 1, the area of the development board of the design is 12.7cm multiplied by 7.6cm, a large number of chip components are adopted, the area of the circuit board is effectively reduced, and the development board has the characteristics of good portability and stability and the like. Students are convenient to carry, can be placed in a schoolbag, can be brought to a laboratory, a classroom, a dormitory and any other places, can download programs only by a desktop computer or a notebook computer and an android mobile phone data line, and can greatly improve the learning interest and the practical ability of the students.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A single chip microcomputer pocket laboratory experiment teaching development board comprises a single chip microcomputer minimum system, a serial port communication circuit, a USB program downloading circuit, an EEPROM circuit, a buzzer circuit, a temperature sensor circuit, a running light circuit, a nixie tube display circuit, an LCD12864 circuit, an LCD1602 circuit, an AD/DA circuit, an independent keyboard circuit and a matrix keyboard circuit, and is characterized in that the single chip microcomputer minimum system is respectively connected with the serial port communication circuit, the USB program downloading circuit, the EEPROM circuit, the buzzer circuit, the temperature sensor circuit, the running light circuit, the nixie tube display circuit, the LCD12864 circuit, the LCD1602 circuit, the AD/DA circuit, the independent keyboard circuit and the matrix keyboard circuit, the serial port communication circuit adopts an RS232 chip, the serial port circuit and the USB program downloading circuit share TXDD and RXD pins of the single chip microcomputer, and a jumper cap is used for selection.

2. The single-chip microcomputer pocket laboratory experiment teaching development board as claimed in claim 1, wherein the single-chip microcomputer in the single-chip microcomputer minimum system adopts STC89C52RC, and is packaged as DIP-40.

3. The single-chip microcomputer pocket laboratory experiment teaching development board as claimed in claim 1, wherein the buzzer circuit employs a +5V active buzzer.

4. The single-chip microcomputer pocket laboratory experiment teaching development board as claimed in claim 1, wherein the temperature sensor circuit adopts a single-bus temperature sensor DS18B20 for temperature measurement.

5. The single chip microcomputer pocket laboratory experiment teaching development board according to any one of claims 1 to 4, wherein the running light circuit is composed of eight 0805 packaged patch light emitting diodes.