S15: MP3 Player with Graphic Equalizer Display

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.

Abstract

The microcontroller (LPC1758) will play MP3/Audio files from SD card, and display the equalizer through LED's with the help of an MP3 audio decoder integrated circuit (VS1053) and equalizer analyzing IC (MSGQE7).

Objectives

Interface the MP3/Audio Decoder IC with Our Microcontroller

The first objective was to interface the MP3/Audio decoder IC (VS1053) with SJSU One board (LPC1758) using SPI bus with some additional pins for data transmit and reset purpose.

Design Software for the MP3 Player

The second objective was to design software for the MP3 player to read files from a SD card then transmit data to the MP3/Audio decoder IC to play and output sound.

Control the MP3 Player Using a remote control

The third objective was to read IR signal from a remote control using IR receiver on SJSU One board and make change on the MP3 player accordingly. Basic commands: play, pause, fastforward, rewind.

Construct Equalizer Analyzing Circuit

The fourth objective was to design the equalizer analyzing circuit using a MSGQE7 chip. The SJSU One board gives the RESET and STROBE signal to the MSGQE7. A 3.5mm audio jack was used to input the audio into the MSGQE7.

Team Members & Responsibilities

• Thinh Lu
  • Designing the MP3/Audio player
• Brian Nguyen
  • Designing the equalizer analyzing circuit
• Andrew Pang
  • Programming LED matrix
  • Editor-in-chief of project report

Schedule

This is our original plan and the status of each task.

Week#	Ending date	Task	Actual
1	4/18	Order all hardware	Completed.
2	4/25	Interface LED matrix with LP1758. Play a single MP3/Audio file	Completed
3	5/1	Finish MP3 driver.	Completed
4	5/15	Finish MP3 player. Interface with a remote control.	Ongoing
5	5/22	Interface LED's as graphic equalizer. Presenting on 5/25.	Completed.

Parts List & Cost

Give a simple list of the cost of your project broken down by components. Do not write long stories here.

• (1) LED Matrix: $24.95
• (1) 12 V power supply: $11.59
• (20) jumper wires: $1.95
• (1) 4-pin Molex connector: $0.95
• (1) Electric tape roll: $0.95
• (1) Graphic equalizer display filter MSGEQ7: $4.95
• (1) Audio Jack 3.5mm: $0.95
• (1) Audio Jack Breakout: $1.50

Design & Implementation

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

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.

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.

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 advice 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:

Issue #1: Programming LED matrix

Our original plan was to output graphic equalizer via a 16-by-32 LED matrix. However, the matrix's library was intended for Arduino, and we could not find a way to port the library to the LPC1758. In the end, we decided to output the graphic equalizer via five LED's on a breadboard, instead. We advise future aspiring engineers to research about available libraries or ask an expert before attempting to interface hardware with a microcontroller.

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

Upload a video of your project and post the link here.

Project Source Code

• Sourceforge 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.