With the development of society, people’s material needs are gradually met, at the same time, the pressure from fast-paced life is also increasing, and spiritual needs are particularly important. Listening to music is also an important way to meet people’s spiritual needs. Music can relieve stress and lighten the burden. Most of the traditional music players do not have the functions of Bluetooth communication, voice recognition and improvisation, and the operation is not humanized and intelligent. In order to solve these problems, we have designed this wireless Bluetooth link music player with voice recognition function, which can bring people a more intelligent and comfortable music playing experience.

With the faster and faster pace of life and the gradual increase of pressure, people’s spiritual needs are also increasing. Listening to music is also an important way to meet people’s spiritual needs. Music can relieve stress and lighten the burden. Most of the traditional music players do not have the functions of Bluetooth communication, voice recognition and improvisation, so the operation is not convenient.

Under the call of a powerful country in science and technology, science and technology have been greatly improved. The function of single-chip microcomputer has also been greatly improved, mainly reflected in its internal structure, power consumption, external voltage and manufacturing technology. To specifically see the improvement of single-chip microcomputer, we can look at it from a typical example: digital single-chip microcomputer. Judging from the current development of single-chip microcomputer,…

This design is a music player based on single-chip microcomputer. in order to better design the system, we should not only understand the requirements of the music player based on single-chip microcomputer and the working principle of the system, but also its related detection methods. we should also learn how to realize the hardware development and circuit design of single-chip microcomputer, as well as related theoretical study and literature query and so on. . The main methods of searching materials and literature are:

Introduction: introduce the relevant knowledge about the music player, as well as the development status of the traditional type of music player, and explain the performance and work requirements of each module from all levels.

Scheme design: through professional science and technology to carry out development and research.

Hardware circuit design: design a suitable scheme.

Software design: after selecting the hardware module,.

Debugging and analysis: test a research and development process of music player based on single-chip microcomputer and analyze whether the result can meet the expected requirements.

The music player based on single-chip microcomputer mainly processes the signal detected by the detector through the hardware host, then carries on a result processing judgment, and displays the data after detection and processing. The research process can be subdivided into the following aspects:

In this design, two types of single-chip computers can be selected:

Through a detailed analysis of the two kinds of single-chip computers, and then compare the two.

In this design, two optional display circuits are provided:

Digital tube circuit, the digital tube of this kind of display circuit is generally used in systems that need to display less things.

Through the detailed analysis of one of the advantages and disadvantages of the above two display circuits, a conclusion is drawn: in order to check.

For keyboard selection, there are two options:

Use matrix keys. Matrix keys have a variety of specifications, such as 4’4 or 2’3 and so on. Matrix keys read the keys by row scan and column scan, so they can also be called row-row keyboard. Take 4-4 matrix keys as an example, there are a total of 14 keys.

Through the above comparison, matrix keys are a good choice when more keys are needed.

Quick response: at present, each different workplace and working environment has increasing hardware requirements for its work equipment, and our design is based on a single-chip microcomputer music player. .

Performance-price index: in this era of rapid development of science and technology, there are many dazzling products on the market. On the basis of completing all the functions of the system, we need to choose an appropriate design scheme, mainly.

When designing hardware circuits, try to use some classical circuits or familiar hardware devices, which not only saves time, but also makes the design more stable and easier to avoid circuit errors.

When designing the hardware circuit, we should understand the best working conditions of each part by means of consulting data in the early stage of the design, and then take this condition into account when designing the circuit. This not only ensures the stability of the circuit operation.

When designing the hardware circuit, we should consider not only the specific hardware problems, but also the software design. For example, some functions can be performed by hardware or software, if the method of adding hardware is used to achieve.

The system circuit schematic diagram of this design is shown in figure 3-1:

The design circuit of the speech recognition module is shown in figure 3-3:

The key circuit also plays an important role in the design. In the music player designed this time, the switching mode can be set through the button circuit, and the key can be played. Because fewer buttons are used. The design circuit is shown in figure 3-6:

The design circuit of the voice broadcasting module is shown in figure 3-7:

The design of the software is an important part of the implementation of this system. After completing the design of the hardware circuit, the following is the aspect of the software design. This system involves the realization of multiple functions, so there is a lot of code in the software design. if the integrated design scheme is adopted, it will not only complicate the structure of the program, but also increase the coupling of each functional code.

The main flow of the system is to process and judge the data detected by the speech recognition module and the signal transmitted by the key module through the single-chip microcomputer.

The operation of the system is to detect and process the data. first of all, each module will initialize the pin information, which is conducive to the follow-up operation of the system and the machine self-test work. When the system controls the mode switch by pressing the key module. The specific flow chart is shown in figure 4-1.

This design uses independent keys, after the keyboard scanning program starts, the first thing is to initialize the module, and then determine whether or not to press the key and determine which key is pressed. Whenever it is detected that a key is pressed,. The process is shown in figure 4-2:

The first part is the program design of speech recognition module single-chip microcomputer. The program flow is shown in figure 4-3.

The second part is the program design of the main control single-chip microcomputer. The program flow is shown in figure 4-4.

Bluetooth module is divided into master Bluetooth module and slave Bluetooth module. The program flow is shown in figure 4-5:

The slave Bluetooth module sends data to the master Bluetooth module when it receives a command from the master Bluetooth module. The program flow is shown in figure 4-6:

This design of the circuit and functional modules in the design to consult the relevant data, taking into account a variety of situations for development, from the display and operation of the humanization to the feasibility of the system have achieved a certain improvement. .

Hardware debugging is an indispensable and important step in this design. after completing the connection of each module according to the circuit schematic diagram of the design, the first key point is to patiently check whether the connection sequence is the same as that of the design.

The second is the debugging of the power supply. before powering up the design, it is necessary to check whether the input power supply voltage is within the acceptable range of the hardware components, otherwise it is likely to cause the collapse of the system, and use the current-limiting adjustable voltage-stabilized power supply as far as possible before powering up the system. and make the over-current protection current in advance, and observe the running status of each hardware after power-up.

The physical diagram of normal operation during power-on operation is shown in figure 5-1:

The whole process of debugging is relatively boring and monotonous. if we want to do this process well, we need to maintain the patience of the spirit of academic research step by step.

Software debugging is an important basis for the realization of the system function, and the functional logic defined by the designer needs to determine whether it is feasible or not through the tool of program debugging. There are three ways to burn a program into a single-chip microcomputer:

Considering the actual situation and the convenience of operation,. The screenshot of the software is shown in figure 5-3:

Because the overall functional design adopts the way of content coupling, which not only reduces the coupling of each module, but also provides great convenience for this debugging. First of all, open the written main function, in which the methods of each functional module are called.

After confirming that there is no problem with the connection of the hardware and the design of the program, the most important step in the design is the joint debugging of hardware and software. The debugging of hardware design and software design can only be regarded as the debugging of the embryonic realization of the system function, and the joint debugging of hardware and software is a debugging with perfect system function. .

In this design, each functional module of the design is tested successively:

Bluetooth module: good communication with mobile phones and computers. The display module for Bluetooth connection is shown in figure 5-4:

Speech recognition module: can accurately recognize “play”, “volume increase”, “pause” and other voice commands and execute.

Display module: characters can be displayed clearly. As shown in figure 5-5:

Speaker module: play music clearly without noise.

The whole debugging process is very challenging; in the process of hardware debugging, we have a deeper understanding of the realization of the connection between the hardware, exercise the ability of practical operation, and accumulate experience in dealing with the wrong way of hardware connection.

The music player based on single-chip microcomputer is well designed to achieve the expected function. But at the same time, due to the limited time and funds, there is still room for improvement in some functions.

With this valuable design experience, I have made great progress in programming, understood the working principle of each module, greatly improved my hands-on ability, and became more proficient in the application of all kinds of software.

My four-year college career will end in this hot summer. Personally, I think.

Here, I am very grateful to my lovely classmates and those who patiently taught me.

Here, I would like to express my special thanks to the teacher who guided me in writing my thesis.

Small surprise, for easy reference, the materials packed together are as follows, which can be downloaded in the link below.