Difference between revisions of "F19: Infinity Mirror"

Revision as of 06:00, 3 December 2019

Infinity Mirror

Abstract

In this project our main aim to build an embedded system based Music System that also displays 7 bands of frequency spectrum on an (32 x 64) LED display. The MP3 system plays music through a speaker interfaced with the board. It deals with the convergence of various services such as gesture recognition, audio decoding, audio saving and retrieving and audio frequency band visualisation etc. This project consists of 'Audio Codec', 'RGB LED Matrix' and 'HC-05' along with some other onboard features like 'Gesture detection', 'Ambient Light Sensing' and 'OLED Display' with SJ-two Launch pad.

Block Diagram of Infinity Mirror

Introduction & Objectives

The key features support by the system are real-time Gesture recognition & trigger actions in player and display audio Spectrum on LED matrix:

1. Determine the actions of air gesture based on the input received or through a manual key selection of songs from the Songs List (In this prototype, search for the response for recognised gesture from the database & perform actions to other peripherals.)

2. In response, retrieve the data from the SD Card & communicate to the audio decoder for audio streaming.

3. Onboard display will show current playing song information and LED Matrix will show audio spectrum patterns using mirroring Visualisation effect.

4. Interacting with HC-05 bluetooth for communicating with Mobile App.

5. A Game related to Audio and Gesture detection - a ball smasher game in which ball will be randomly created on the LED matrix based on the Audio Frequency which will be smashed by collecting Gesture in that particular direction and display the score on the OLED Display.

Project Objectives

     1. Audio Codec - Interacting with Audio Codec for getting the sound samples & generating sound signals from the device
     2. Gesture Sensor - Detects the Hand Gesture and send the detected gesture to LED Matrix to navigate LED's.
     3. SD Card - Audio data or mp3 files will be retrieved from the SD card based on the user selection.
     4. Audio Decoder - Intelligently processing the audio data using audio decoder and sent to the LED Matrix to display spectrum patterns.
     5. Bluetooth HC-05 - Interfaces the system using Bluetooth to an Android application. 

Team Objectives

     1. Learn each and every module as much as possible, in order to develop an overall product.
     2. Understand the proper use of queues and semaphores in order to send/receive the data between multiple tasks.
     3. Document and track all the bugs encountered during development and learn to update git repo after every fix.

Team Members & Technical Responsibilities

TEAM INFINITY MIRROR

• MP3 Audio Encoder/Decoder
  • Aakash Chitroda

• Bluetooth Communication
  • Niket Naidu

• Interfacing of LED Matrix
  • Ganesh Ram

• Interfacing of Gesture & Accelerometer Sensors
  • Vidushi Jain

• Android & Web Application
  • Niket Naidu

• OLED Interfacing & UI Designing
  • Niket Naidu

• Hardware PCB Integration
  • Aakash Chitroda
  • Vidushi Jain

• Testing
  • Aakash Chitroda
  • Vidushi Jain

Administrative Responsibilities

Team Deliverables Schedule

Bill of Materials (General Parts)

Printed Circuit Board

Design And Architecture

Power Section

Fabrication

3D printing models

We used a 3D mount model to place our PCB Board.

Top View

3D View

RGB LED Matrix

A 32 x 64 RGB LED Matrix will be powered up through a 5V/4A DC adapter and is interfaced with the board to display the frequency bands and other relevant messages such as "Next", "Previous" and "Pause". Only the INPUT IDC connector will be used because we are not cascading multiple matrices. The matrix has 2 planes (upper and lower), both of which will be programmed separately. In order to set RGB color data for each pixel in plane 1 (top half of the display) we use R1, G1 and B1 pins and for plane 2 we use R2, G2 and B2. By setting and resetting the CLOCK pulse, color data is set for every pixel in the row. Then the LATCH is set to mark end of the row and reset to move to next row. All of these steps are repeated at very less time intervals so that the human eye perceives it as one complete frame (Persistence of Vision).

Below is the description of the pins:

• R1 -> Sets upper panel's Red data
• G1 -> Sets upper panel's Green data
• B1 -> Sets upper panel's Blue data
• R2 -> Sets lower panel's Red data
• G2 -> Sets lower panel's Green data
• B2 -> Sets lower panel's Blue data
• A -> Sets row bit 0
• B -> Sets row bit 1
• C -> Sets row bit 2
• D -> Sets row bit 3
• CLK (Clock) -> Set to access each pixel
• LAT (Latch) -> Set to mark comletion of one row
• nOE (Output Enable) -> Set to switch the LEDs off when transitioning from one row to the next
• GND -> Ground pins to be connected with board's GND.

LED Matrix Code

GitLab link to LED Matrix Code

Hardware Design

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.

LED Matrix Pin Diagram

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.

MP3 Decoder

=MP3 Decoder Code

GitLab link to MP3 Decoder Code

Hardware Design

MP3 Decoder Pin Diagram

Software Design

Implementation

Sensors Interface

Sensor Code

GitLab link to Sensor Code

Hardware Design

Software Design

Implementation

OLED Display

OLED Display Code

GitLab link to OLED Display Code

Hardware Design

Software Design

Implementation

Bluetooth Interface

Bluetooth Code

GitLab link to Bluetooth Code

Hardware Design

Bluetooth Interface Pin Diagram

Software Design

Implementation

Testing and Technical Challenges

1. RGB LED Matrix

a) Getting control of the matrix was challenging as it needs to follow specific sequence of pin enabling/disabling at appropriate timing.

• Tip - Focus on writing simple driver to get control of 1 pixel at a targeted location and then use appropriate loops to light up entire row/column.

b) Setting right delays to avoid flickers and get smooth transitioning between frames.

• Tip - Try with minimum / no delays, print tick counts and then come up with meaningful delay numbers.

c) Fixing high CPU utilization.

• Tip - Optimize the code (minimum delays, avoiding repetitive function calls etc.) to bring down the CPU usage level.

d) Designing elements of the game (title screen and fruit objects).

• Tip - Use the link mentioned in the reference to draw the desired elements and generate the matrix.

Suggestions for Future Students

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

• Git Project Link: [1]

References

Acknowledgement

We would like to thank professor Preet for giving us the opportunity to incorporate the theory learnt into practical model and supporting us whenever needed. Availability of slack channel and weekly reviews ensured us to clarify bottlenecks in the project, keep things organized and track progress of each tasks. We would also extend our gratitude towards ISA members who have taken their time in clearing our queries throughout the course.

References Used

Android GUI

• Create App Icons with Image Asset Studio
• Building a Dynamic UI with Fragments
• Android Tutorial

RGB LED Matrix Interfacing and Designing

• Datasheet and Hookup guide
• Wiring and pin information
• Hex code generator to build LED matrix