# Sixth Lichuang Electric Competition# Labyrinth Desktop Music Rhythm Speaker-Yue 2.0

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Please fill it out during the registration stage↓

* 1. Introduction to project functions

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Labyrinth Desktop Music Rhythm Speaker-Yue-2.0

The lights move with the music, and the invisible sound allows our eyes to feel the beauty of the sound through the rhythm of the lights. The beautiful human voice and the gorgeous lights blend together, giving us the ultimate experience for our ears and eyes.

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Features: 1. Labyrinth box, improves the lower limit of low frequency and reduces distortion

           2.Colorful lighting effects

Function: 1. Musical rhythm

           2.24 lighting effects

           3. Click the button to switch modes

           4. Long press the button to turn on or off the light

           Switch a rhythm color in 5.5 seconds

           6. The light show mode switches the effect once every 8 seconds, and click the button again to lock the current mode.

           7. Automatically switch to wait for light effects when there is no sound

Yue-2.0 has excellent sound quality, beautiful vocals, powerful bass, and cool lighting. The labyrinth structure replaces the traditional closed box and effectively reflects the sound waves (negative phase waves) generated by the speaker's backward vibration through the labyrinth. Backward, it is superimposed with the forward wave generated by the forward vibration of the speaker. The amplitude increases and the sound becomes louder, achieving the effect of stronger bass and more realistic vocals.

DIY gameplay

On the light strip, you can replace the 60 pcs/m light strip with 144 pcs/m for a smoother rhythm. You can also install a light strip on the side edge of the speaker for a more three-dimensional effect. Or replace the entire side with a music spectrum, etc.

In terms of program, you can change the color of the rhythm in the program according to your own preferences, or change the effect of the rhythm and add more lighting effects.

In terms of control, you can use the esp8266's ability to connect to wifi and write a host computer to control the light color. You can also connect to the cloud platform and connect to the mobile voice assistant to play the role of voice control to switch songs and change light effects.

If you have other ideas, you can DIY it yourself.

Note: There is no limit to the theme. It can be a solution to a certain problem in life/work, a plan designed for a certain group of people/scenarios, graduation project/course design/DIY project/purely cool project, etc. Mainly talk about what problems you solved by what means.

*2. Project attributes

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 The sound sensor schematic diagram refers to Open Source Square: Foreign Excellent Engineering Demonstration Team https://lceda.cn/oshwlab/ky-038-mai-ke-feng-sheng-yin-chuan-gan-qi-mu-kuai

 Yue-2.0's CAD shell, PCB music rhythm board, and program design are all original and open source for the first time.

Note: Please indicate whether the project has been made public for the first time; whether the project is original; whether the project has won awards in other competitions; if so, describe the details of the award; whether the project has participated in a defense in school.

* 3. Open source agreement

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GPL 3.0 : https://opensource.org/licenses/GPL-3.0

Note: Altruism means self-interest, please read the following content carefully.

1. Embrace open source and give projects unlimited value. It is recommended that more than 80% of the core functions of the project be open source;
2. If a certain part of the function is irreplaceable and the project cannot solve the corresponding problem after deletion, then the function implemented by this part is the core function of the project; for example, if an electronic load is designed and a host computer software is designed to monitor power changes, the electronic The load is the core function, and the host computer software is the auxiliary function; for example, an isolated 485 module is used in the electronic load to communicate with the host computer, then the communication function implemented by this 485 module is an auxiliary function;
3. Projects should choose an open source agreement that suits them . If the project references other open source projects, the source should be indicated and follow the original author's open source agreement. It is recommended that original projects use the GPL3.0 open source agreement;
4. Functions implemented by directly quoting the original circuits or original codes of open source projects cannot be used as the core functions of one's own projects, and functions directly implemented using common modules on the market cannot be used as core functions of one's own projects.

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*4. Hardware part

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The music rhythm board PCB hardware mainly includes three parts, DCDC power supply, sound sensor, and esp8266 main control

DCDC power supply: LM2596s step-down chip is used. Its main function is to convert the 12-24v power input of the speaker into 5v to power the light strip. Then 5v is linearly stepped down to 3.3 by Ams1117 to power the esp8266 chip.

Sound sensor: The microphone collects the sound intensity of the surrounding environment. The electret film in the microphone vibrates to generate a weak voltage that is gained by the lm393 voltage comparator and then transmitted to the esp8266 ADC pin for analog signal collection.

esp8266: Control lighting effects, rhythm mode + light show mode

Rhythm board power input: supports 5v or 7-24v power supply (generally connected to the power amplifier board)

Output current: supports up to 5v 3A output (more than 2A requires a heat sink)

Currently, the 144/m lamp strip is tested to work normally. It is recommended that the number of lamp beads be less than 200.

Interface output: two ws2812 light strip interfaces, the middle signal pins are connected to esp8266 IO4 IO5 respectively

                  The two button interfaces are connected to IO14 and IO12 respectively for light switch control and light effect switching.

Download program: Use ch340 or cp2102 burner to connect and download, csdn has tutorials.

Considering the size and cost, there is no power amplifier board designed for the speaker. The rhythm board is drawn with reference to the size of the 40w Bluetooth 5.0 power amplifier on a certain product. It can be connected and combined with copper pillars, and the sound quality is very good.

Note: It is recommended to use Lichuang EDA . If you choose other EDA tools, please upload schematics in PDF format, PCB drawings in PDF format, and PCB files in Gerber format in the attachments. Here you can explain in detail your project implementation principles and mechanisms, precautions, debugging methods, testing methods, etc. It is recommended to introduce your ideas to others in the form of pictures and texts.

*5. Software part

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Software: esp8266 is developed using the arduino platform, using FastLED and WS2812FX open source library files.

Rhythm principle: After powering on, the ambient sound intensity is automatically read to form a baseline in a silent state. The baseline is automatically adjusted according to the ambient sound, with filtering noise characteristics. When the collected sound signal is greater than the baseline*filter threshold, it will be set from 0 to beyond the baseline. The value is mapped from 0 to the number of light strips, which can achieve the effect that the louder the sound, the more light beads are lit. Adding lamp beads to fall back and increase delay in the program will cause the lamp beads to rise and fall with the rhythm of the music, achieving a rhythmic effect.

Features: 1. Using median average filtering

           2. Baseline compensation

           3. Lamp bead fallback algorithm

           4. Baseline automatic adjustment

Note: If your project involves software development, please upload the corresponding project source code in the attachment. Here you can describe in detail your software flow chart, functional module block diagram, explanation or popular science of related algorithms, source code structure, construction and configuration of compilation environment, source code compilation method, program burning method, etc. It is recommended to introduce your ideas to others in the form of pictures and texts.

*6. BOM list

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Note: BOM list involved in the project. Please upload a screenshot of the BOM at this location. Please upload the list details in PDF format to the attachment. Suggestions include model, brand, name, packaging, procurement channels, usage, etc. The specific content and form should be based on clearly expressing the project composition.

*7. Contest LOGO verification

Please upload a project picture containing the competition logo. The logo will be printed on the PCB in the form of silk screen printing.

Click the zip to download the competition logo! (Contest logo).zip

* 8. Demonstrate your project and record it as a video for uploading

Video requirements: Please shoot horizontally, with a resolution of no less than 1280×720, in Mp4/Mov format, and the size of a single video is limited to 100M;

Video title: Lichuang Electric Competition: {Project Name}-{Video Module Name}; such as Lichuang Electric Competition: "Autonomous Driving" - Team Introduction.

More details: https://diy.szlcsc.com/posts/06c94d90c2c447dfbd9ed7339ff4a5b1