S18: Audio Spectrum Analyzer with Graphics Display
Contents
Grading Criteria
- How well is Software & Hardware Design described?
- How well can this report be used to reproduce this project?
- Code Quality
- Overall Report Quality:
- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Project Title
Audio Spectrum Analyzer with Graphics Display
Abstract
This porject is going to use an RGB LED-matrix to display graphics base on the MP3 audio frequencies, and with an MP3 decoder chip which will be used to connected to one of the SJOne board with MP3 files in its SD card to decode audio and send to DAC which is connected to our speakers. The user will be able to see graphics on the RGB LED matrix instantly while playing MP3 files, and have some control buttons to control the music like pause, resume, skip, and control matrix's display screen, modes, and rotation with different orientation.
Objectives & Introduction
Introduction
Our team split the project into four different parts: The audio decoder, the audio analyzer, the RGB LED Matrix, and the PCB design. Thus, two of our team members split the hardware and the software parts, some they worked together, some they worked individually. The other team member only wanted to work on the PCB design and have not done anything at this point. The Equalizer part focuses on the conversion of audio input into an ADC output that can be parsed and create a data representation for the RGB LED Matrix. The RGB LED Matrix part is mainly focus on parsing the converted data and drive the RGB LEDs to display the appropriate representation of the signals.
Objectives
Follow proper engineering and testing practices to design and implement the following:
- Design equalizer PCB
- Interfacing audio decoder pin layout and system design
- Interfacing audio equalizer pin layout and system design
- Interfacing RGB LED matrix pin layout and system design
- Implement audio decoder driver
- Implement audio equalizer driver
- Implement RGB LED matrix driver
- Integrate equalizer and RGB LED matrix
- Test overall system and program
- Preparing whole project hardware design as a demo ready package
Team Members & Responsibilities
- Lorenzo Javier
- Audio Decoder Interfacing w/ SJOne Board (MP3 Driver)
- Graphic Equalizer Interfacing w/ Audio Decoder (Pin Layout/System Design)
- Jason Lin
- Graphic Equalizer Interfacing w/ SJOne Board (Audio Analyzer Driver)
- RGB LED Matrix Interfacing w/ SJOne Board (RGB LED Driver)
- All nice to have functions (MP3 pause, resume, and skip / display modes, rotation, splash/pause/skip screen, and entertainment bar/dot and spinning)
- Project container made with cardboard box
- Bohan Liu
- PCB Design (don't know if he is ever gonna do anything)
Schedule
Show a simple table or figures that show your scheduled as planned before you started working on the project. Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals. The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.
| Week# | Ending date | Task | Actual |
|---|---|---|---|
| 1 | 4/15 | Order all Components. | Completed |
| 2 | 4/22 | Interface Audio Analyzer with 3.5mm audio cable as input and splits it into seven bands.
Implementing a testing program to test if can correctly get correct frequencies from the audio analyzer. Initialize RGB LED Matrix with different colors. |
Completed |
| 3 | 4/30 | Read MP3/Audio file from SD card through SPI.
Control every LED on RGB LED Matrix with giving them specify color. Design the basic board layout |
Completed |
| 4 | 5/7 | MP3 driver decodes MP3/Audio file and sends it to the Audio Analyzer.
Read MP3/Audio file from SD card and play sample song with output speakers connected. Finalize PCB Design & modify board layout & Print PCB. |
Completed (besides PCB) |
| 5 | 5/14 | Interface RGB LED Matrix's as a graphic equalizer.
Get audio spectrum values from audio analyzer and display on the RGB LED Matrix. Develop RGB LED Matrix display layout, styles, and modes like color and sound wave behavior. Implementing music player control functions for sound box control. |
Completed |
| 6 | 5/21 | Final testing and debugging.
Finish project report & Demo on 5/23. |
In progress |
Parts List & Cost
Give a simple list of the cost of your project broken down by components. Do not write long stories here.
| # | Name | Purchase Location | Description | Quantity | Cost |
|---|---|---|---|---|---|
| 1 | Audio Analyzer | Amazon DFROBOT | Graphic Equalizer Display Filter ‑ MSGEQ7 Breakout Board | 1 | $21.55 |
| 2 | Audio Decoder | Adafruit | VS1053 Audio Decoder Breakout Board w/ Breadboard-Friendly 3.5mm Stereo Headphone Jack | 1 | $24.95 |
| 3 | RGB LED Matrix (16x32) | Adafruit | RGB LED Matrix Panel (16x32) | 1 | $24.95 |
| 4 | Jumper Wires | Amazon | Variety of Male/Male, Male/Female, & Female/Female Breadboard Jumper Wires | 120 | $7.49 |
| 5 | Breadboard | Amazon | Breadboard - Small | 1 | $8.21 |
| 6 | SJOne Board | Social Ledge | LPC1758 Chipset | 2 | $160.00 |
| 7 | 5V 2.4A Portable Battery | Amazon | Portable Power Supply (5V 2.4A) | 1 | $10.99 |
| 8 | Audio Jack | Digi-Key | 3.5mm Audio Jack | 1 | $1.29 |
Design & Implementation
This section will provide an overview of our design methodology for the MP3 audio decoder, graphic equalizer, and RGB LED matrix independently, and then will describe the integration of all components.
Hardware Design
Discuss your hardware design here. Show detailed schematics, and the interface here.
MP3 Audio Decoder
text
Graphic Equalizer
text
RGB LED Matrix
text
Hardware Interface
In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.
MP3 Audio Decoder
text
Graphic Equalizer
text
RGB LED Matrix
text
Software Design
Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.
MP3 Audio Decoder
text
Graphic Equalizer
text
RGB LED Matrix
text
Implementation
This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.
Testing & Technical Challenges
Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.
Include sub-sections that list out a problem and solution, such as:
MP3 Audio Decoder
Pin Connections
Discuss the issue and resolution.
RGB LED Matrix
<Bug/issue name>
Discuss the issue and resolution.
Conclusion
Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?
Project Video
Project Source Code
- [Audio Spectrum Analyzer with Graphics Display Source Code Link]
References
Acknowledgement
Any acknowledgement that you may wish to provide can be included here.
References Used
List any references used in project.
Appendix
You can list the references you used.
