CN212624515U

CN212624515U - Singlechip experimental board

Info

Publication number: CN212624515U
Application number: CN202021132948.XU
Authority: CN
Inventors: 罗国; 潘丽敏; 张思文; 陆翠静; 梁小芬; 李慧
Original assignee: Nanfang College Of Sun Yai-Sen University
Current assignee: Nanfang College Of Sun Yai-Sen University
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-02-26
Anticipated expiration: 2030-06-17

Abstract

The utility model discloses a singlechip experimental board, which comprises a circuit board, wherein the circuit board is provided with an STC series experimental chip and a plurality of experimental modules electrically connected with the experimental chip; the circuit board is also provided with a USB interface and a main power supply module, the main power supply module is used for supplying power to the experiment modules, and the USB interface is electrically connected with the experiment chip through a serial port conversion module; an interrupt controller and an electronic switch are also arranged between the serial port conversion module and the experimental chip, the electronic switch is used for controlling the on/off of a power supply passage between the experimental chip and the USB interface, an interrupt pin of the interrupt controller is electrically connected with a DTR pin of the serial port conversion module, and a control pin of the interrupt controller is electrically connected with a control end of the electronic switch; by adopting the experimental board, when programming is carried out, a user does not need to carry out cold start operation on the experimental chip, and the experimental chip power supply and the experimental module power supply are separately and independently arranged, so that the experimental chip can be prevented from being burnt out.

Description

Singlechip experimental board

Technical Field

The utility model relates to a real standard equipment technical field of singlechip especially relates to a singlechip experiment board.

Background

In the learning of the embedded singlechip control technology, besides the learning of the theoretical technology, the practice is an important means for improving the mastering of the student singlechip technology, and each singlechip learner can prepare an experimental board for the practice of the singlechip at present. The singlechip experimental board is generally provided with a minimizing system comprising a singlechip and a commonly used practical training module. In many families of single chip microcomputer chips, STC series have the advantages of simple structure and flexible control, and are particularly suitable for being used as learning objects of beginners. However, for the STC single-chip microcomputer, when programming, the single-chip microcomputer needs to be cold-started once, and many students easily omit the operation program, which brings inconvenience, time and labor consumption to the operation and learning of the students. In addition, for the existing singlechip experimental board, the singlechip minimum system and the practical training module share one power supply, and when the practical training module circuit has a problem, the singlechip with the highest value is easily burnt out.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a do not need to carry out the singlechip experiment board of cold start operation when carrying out the procedure to the singlechip and burn to write for solving above-mentioned technical problem.

In order to achieve the purpose, the utility model discloses a singlechip experimental board, which comprises a circuit board, wherein the circuit board is provided with a STC series experimental chip and a plurality of experimental modules electrically connected with the experimental chip;

the circuit board is also provided with a USB interface and a main power supply module, the main power supply module is used for supplying power to the experiment modules, the USB interface is electrically connected with the experiment chip through a serial port conversion module, so that the USB interface is used for supplying power to the experiment chip and programming programs, and the serial port conversion module is used for converting bus data of the USB interface into serial port data;

an interrupt controller and an electronic switch are further arranged between the serial port conversion module and the experimental chip, the electronic switch is used for controlling the on/off of a power supply circuit between the experimental chip and the USB interface, an interrupt pin of the interrupt controller is electrically connected with a DTR pin of the serial port conversion module, a control pin of the interrupt controller is electrically connected with a control end of the electronic switch, and the interrupt controller is used for controlling the action of the electronic switch according to the data preparation state of the serial port conversion module

Compared with the prior art, the single chip microcomputer experiment board of the utility model is provided with two independent power supplies, namely, the main power module supplies power to a plurality of experiment modules, and the USB interface supplies power to the experiment chips, so that the experiment chips are isolated from the power circuit of the experiment modules, and when the experiment modules break down due to overlarge current, the experiment chips can be prevented from being burnt out; secondly, the USB interface is also used as a programming serial port, so that resources are saved; in addition, through the setting of interrupt controller and electronic switch, when carrying out the procedure through the USB interface and burn and write, trigger interrupt controller and carry out once to break off to the control pin control electronic switch through interrupt controller takes place once from switching on to the state transform that switches on again to the disconnection, and then makes the experiment chip take place once cold start automatically, need not the student and carries out the operation of cold start, makes things convenient for going on in order of student's experiment process, labour saving and time saving.

Preferably, the electronic switch is an MOS switch tube, a control pin of the interrupt controller is electrically connected to a gate of the MOS switch tube, and when the interrupt pin of the interrupt controller receives an interrupt signal, the control pin of the interrupt controller performs a level conversion and a level recovery.

Preferably, the plurality of experiment modules comprise one or more of a buzzer module, a liquid crystal display module, an infrared sensor module, a nixie tube display module, a temperature sensor module, a photosensitive sensor module, an LED module, a decoder module, a key module, a dot matrix module, a gas concentration sensor module, a wireless communication module, a direct current motor control module, a stepper motor control module, a relay charging control module, an AD conversion module and a DA conversion module.

Preferably, the buzzer module comprises a passive buzzer.

Preferably, the liquid crystal display module comprises a 12864 liquid crystal display.

Preferably, the circuit board is further provided with a voltage-stabilized power supply module electrically connected with the main power supply module.

Preferably, a self-recovery fuse is further disposed in the current path of the main power supply module.

Preferably, the main power module provides 12V dc power for the circuit board.

Drawings

Fig. 1 is a schematic diagram of the circuit connection between the USB interface and the experimental chip in the embodiment of the present invention.

Fig. 2 is the utility model discloses in the embodiment of the planar structure sketch map of singlechip laboratory sheet.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

As shown in fig. 1 and 2, the utility model discloses a singlechip experiment board for real study of instructing of singlechip, its one of which circuit board 1 is provided with a STC series's experiment chip 2 on the circuit board 1 and with experiment chip 2 electric connection's a plurality of experiment modules. The test chip 2 in this example was STC89C 52. Still be provided with USB interface 40 and main power module 5 on the circuit board 1, main power module 5 is used for providing the power supply for a plurality of experiment modules, and USB interface 40 is through a serial ports conversion module 41 and experiment chip 2 electric connection to make USB interface 40 be used for providing the power supply and burn the program for experiment chip 2, serial ports conversion module 41 is used for converting the bus data of USB interface 40 into serial ports data. In this embodiment, the USB interface 40 and the main power module 5 respectively provide power supply for the experiment chip 2 and the experiment module, so that the experiment chip 2 is isolated from the power circuit of the experiment module, and when the experiment module fails due to excessive current, the experiment chip 2 can be prevented from being burned out.

As shown in fig. 1, when programming the experiment chip 2, in order to enable the experiment board to automatically perform a cold start in a background, an interrupt controller 42 and an electronic switch 43 are further disposed between the serial port conversion module 41 and the experiment chip 2, the electronic switch 43 is used to control on/off of a power supply path between the experiment chip 2 and the USB interface 40, an interrupt pin of the interrupt controller 42 is electrically connected to a DTR pin of the serial port conversion module 41, a control pin of the interrupt controller 42 is electrically connected to a control terminal of the electronic switch 43, and the interrupt controller 42 is used to control an action of the electronic switch 43 according to a data preparation state of the serial port conversion module 41.

Preferably, the electronic switch 43 is a MOS switch, the control pin of the interrupt controller 42 is electrically connected to the gate of the MOS switch, and when the interrupt pin of the interrupt controller 42 receives an interrupt signal, the control pin of the interrupt controller 42 performs a level shift and a level recovery.

Specifically, as shown in fig. 1, the model of the conversion chip of the serial port conversion module 41 in the above embodiment is CH340, and the interrupt controller 42 employs an interrupt register in ST15W 408. The power supply pin (VCC) and the data pin (UD +, UD-) of the CH340 are respectively connected with corresponding pins on the USB interface 40, the DTR pin of the CH340 is connected with the interrupt interface P3.2 of the ST15W408, the grid of the MOS switch tube is connected with the control pin P1.0 of the ST15W408, meanwhile, the grid of the MOS switch tube is grounded through a current-limiting resistor, and the source and the drain of the MOS switch tube are respectively connected with the power supply terminals of the USB interface 40 and the STC89C 52. Under normal conditions, the control pin P1.0 of ST15W408 outputs high level, so that the MOS switch is turned on, and the USB interface 40 only provides power supply to STC89C 52. When the programming data is transmitted to the STC89C52 through the USB interface 40, the DTR pin of the CH340 outputs a low level, thereby triggering the interrupt register in the ST15W408 to generate a single interrupt, causing the level state output by the control pin P1.0 of the ST15W408 to change during the interrupt duration, and the change process is a high level-a low level-a high level, which in turn causes the switching state of the MOS switch tube to change from on to off during the single interrupt duration, and then from off to on, causing the power supply path of the STC89C52 to generate a single interrupt, and further causing the automatic cold start during the programming of the STC89C 52. Therefore, when the program programming is carried out through the experimental board, an operator does not need to pay attention to the operation of the cold start of the experimental chip 2, time and labor are saved, and the normal operation of experimental work is facilitated.

Further, as shown in fig. 2, in order to meet the learning requirements of the user in multiple technical fields of the single chip microcomputer control technology, the plurality of experimental modules include one or more of a buzzer module 301, a liquid crystal display module 302, an infrared sensor module 303, a nixie tube display module 304, a temperature sensor module 305, a photosensitive sensor module 306, an LED module 307, a decoder module 308, a key module 309, a dot matrix module 310, a gas concentration sensor module 311, a wireless communication module 313, a direct current motor control module 314, a stepping motor control module 315, a relay charging control module 316, an AD conversion module 317, and a DA conversion module 318. Preferably, the buzzer module 301 comprises a passive buzzer, and the passive buzzer is controlled by self-regulation, so that the operation is flexible and simple. The lcd module 302 includes a 12864 lcd, which has low power consumption, small size, light weight, and ultra-thin profile, and can display 8 × 4 (16 × 16 dot matrix) chinese characters and pictures. Preferably, the main power module 5 provides 12V dc power for the circuit board 1 to meet the requirements of the experiment modules for power supply.

Further, in order to ensure the stable operation of the experiment and avoid the influence of voltage fluctuation on the experiment result, a voltage-stabilized power supply module 6 electrically connected with the main power supply module 5 is further arranged on the circuit board 1. In addition, in order to avoid burning out the electronic devices in the experimental module, a self-recovery fuse 7 is further arranged in the current path of the main power supply module 5.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.

Claims

1. The singlechip experimental board is characterized by comprising a circuit board, wherein an STC series experimental chip and a plurality of experimental modules electrically connected with the experimental chip are arranged on the circuit board;

an interrupt controller and an electronic switch are further arranged between the serial port conversion module and the experiment chip, the electronic switch is used for controlling the on/off of a power supply circuit between the experiment chip and the USB interface, an interrupt pin of the interrupt controller is electrically connected with a DTR pin of the serial port conversion module, a control pin of the interrupt controller is electrically connected with a control end of the electronic switch, and the interrupt controller is used for controlling the action of the electronic switch according to a data preparation state of the serial port conversion module.

2. The single chip microcomputer experiment board according to claim 1, wherein the electronic switch is an MOS switch tube, a control pin of the interrupt controller is electrically connected to a gate of the MOS switch tube, and when the interrupt pin of the interrupt controller receives an interrupt signal, the control pin of the interrupt controller performs a level shift and a level recovery.

3. The single-chip microcomputer experiment board according to claim 1, wherein the plurality of experiment modules comprise one or more of a buzzer module, a liquid crystal display module, an infrared sensor module, a nixie tube display module, a temperature sensor module, a photosensitive sensor module, an LED module, a decoder module, a key module, a dot matrix module, a gas concentration sensor module, a wireless communication module, a direct current motor control module, a stepper motor control module, a relay charging control module, an AD conversion module and a DA conversion module.

4. The single chip microcomputer experiment board according to claim 3, wherein the buzzer module comprises a passive buzzer.

5. The single-chip microcomputer experiment board according to claim 3, wherein the liquid crystal display module comprises a 12864 liquid crystal display.

6. The single-chip microcomputer experiment board according to claim 1, wherein a voltage-stabilized power supply module electrically connected with the main power supply module is further arranged on the circuit board.

7. The single chip microcomputer experiment board according to claim 1, wherein a self-recovery fuse is further arranged in a current path of the main power supply module.

8. The single chip microcomputer experiment board according to claim 1, wherein the main power supply module supplies 12V direct current power supply to the circuit board.