Difference between revisions of "S18: Audio Spectrum Analyzer with Graphics Display"

Revision as of 11:15, 23 May 2018

Grading Criteria

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 wanted to work on the PCB design and software and hardware of the LED matrix, he provided essential contribution to make audio analyzer working and try to work on other parts. 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 dynamic frequencies 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 the nice to have functions (MP3 pause, resume, and skip / display modes, rotation, splash/pause/skip screen, and entertainment bar/dot and spinning)
  • Made project container with cardboard box

• Bohan Liu
  • PCB Design
  • Design the basic schema for the Audio Decode Chip
  • Adding surrounding component to MSGEQ7 chip and make it connectable to other components
  • Tested the connections of the basic schema
  • Generate the connected PCB board layout
  • Wired the PCB board layout

Schedule

Parts List & Cost

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

Design & Implementation

This section will provide an overview of our design methodology for the MP3 audio decoder, audio analyzer graphic equalizer, and RGB LED matrix independently, and then will describe the integration of all components.

Hardware Design

Overall Schematic of Pin Connections

MP3 Audio Decoder

Adafruit VS1053 MP3 Audio Decoder Breakout Board

The VS1053 MP3 audio decoder breakout board connects to the SJOne board through the SPI protocol (MOSI, MISO, SCLK, XDCS) for sending/receiving data.

The other pins DREQ, XCS, SDCS, and RST are connected to the SJOne board pins as GPIO functionality.

The AGND, LOUT, and ROUT pins are split out between the 3.5mm stereo headphone jack and the audio analyzer breakout board.

Here is a description of the pin functionalities as follows:

• XCS -> a chip select pin for SCI operation (to control settings, i.e. volume)
• XDCS -> a chip select pin for SDI operation (to enable data transfer)
• RST -> a reset pin to perform a hard reset of previous data/settings
• DREQ -> a status pin to notify when the buffer is ready to receive more data (busy = 0, ready = 1)
• SDCS -> a chip select pin for enabling/disabling the MicroSD card slot
• AGND -> a common ground pin
• LOUT -> the analog left audio data pin
• ROUT -> the analog right audio data pin

The remaining pins are VCC (5V), and GND (Ground).

Graphic Equalizer

DFROBOT Audio Analyzer Schematic

DFROBOT Audio Analyzer (MSGEQ7) Graphic Equalizer Breakout Board

The Audio Analyzer breakout board features the MSGEQ7 graphic equalizer display filter. It splits the analog audio input into seven different frequency bands. The seven frequencies measured are as follows: 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz. It connects to the SJOne board through the ADC (ANALOG) protocol for reading the values of seven frequencies.

The other pins, RESET and STROBE, are connected to the SJOne board pins as GPIO functionality.

Here is a description of the pin functionalities as follows:

• ANALOG-> a chip select pin for Output analog signal (for ADC on SJOne board to read)
• RESET -> a chip select pin for Input GPIO signal (to get reset signal from SJOne GPIO)
• STROBE-> a chip select pin for Input GPIO signal (to be precisely controlled to read the analog outputs properly)

The remaining pins are VCC (5V), and GND (Ground).

RGB LED Matrix

Adafruit 16x32 RGB LED Matrix

The 16x32 RGB LED Matrix features as a display panel. It has two IDC connectors INPUT and OUTPUT on the back to connect multiple panels, but we only use one on this project. Its RGB data is separate in 1 and 2, 1 represent the upper half of the matrix, 2 represent the lower half. This matrix has a decoder which takes ABC as input to decode the corresponding row on both upper and lower half of the panel. Every color pin has a 32-bit shift register. With the clock single implement with the shift register, we can control every column of LED's color on each row.

The Latch signal is for indicate the end of the data line. It connects to the SJOne board through pins (R1, G1, B1, R2, G2, B2, A, B, C, CLK, LAT, OE) as GPIO functionality.

Here is a description of the pin functionalities as follows:

• R1 -> a chip select pin for Input GPIO signal (to control upper panel's R data)
• G1 -> a chip select pin for Input GPIO signal (to control upper panel's G data)
• B1 -> a chip select pin for Input GPIO signal (to control upper panel's B data)
• R2 -> a chip select pin for Input GPIO signal (to control lower panel's R data)
• G2 -> a chip select pin for Input GPIO signal (to control lower panel's G data)
• B2 -> a chip select pin for Input GPIO signal (to control lower panel's B data)
• A -> a chip select pin for Input GPIO signal (to select both upper and lower panel's row bit 2)
• B -> a chip select pin for Input GPIO signal (to select both upper and lower panel's row bit 1)
• C -> a chip select pin for Input GPIO signal (to select both upper and lower panel's row bit 0)
• CLK -> a chip select pin for Input GPIO signal (to get clock signal from SJOne board)
• LAT -> a chip select pin for Input GPIO signal (to get latch signal from SJOne GPIO)
• OE -> a chip select pin for Input GPIO signal (Output enable to cascade LED matrix)

The remaining pins are VCC (5V), and four GND (Ground).

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

The issue was that the MOSI and MISO connections were switched up. It took a while to see that these pins were connected incorrectly, but after some double checking, we made sure that the MOSI->MOSI pins and MISO<-MISO pins were properly attached to each other.

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

• Youtube Video Link
• Google Drive Video Link

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.

• VS1053 Datasheet
• MSGEQ7 Datasheet
• RGB LED Matrix Tutorial

Appendix

You can list the references you used.