EBOX

Project Proposal

Overview

We created an audio responsive LED lighting system integrated on a desk that can be used as a fun addition to one's home entertainment and lighting systems. The EBOX has 3 modes that the user can set with a tap of a touch sensor to customize the dynamic light patterns to fit any mood.

Group Members

Jordan Gewirtz

Chanel Lynn

Nish Chakraburtty

Tony Sancho-Spore (TA)

Dr. James Feher (Prof)

Link to Log

• https://classes.engineering.wustl.edu/ese205/core/index.php?title=EBOX_Log
• eBOX WUSTL BOX: https://wustl.app.box.com/folder/57307264614

]*Link to tutorial here

Objectives

• Use an Arduino to implement a Fast Fourier Transform(FFT)
• Integrate the FFT through the Arduino with our LED lights
• Make the LED lights respond music with a specific, non-random color scheme
• Have the Light intensity change with the decibel level of the music
• User interface

Challenges

• learn Arduino
• Soldering
• learn complex circuitry
• carpentry
• writing the code and interfacing the Arduino with the LEDs and Sound receptor
• Learn to not short our entire project
• Learn how to use transistors
• Make sure nothing blows up
• Staying under budget

Gantt Chart

• 

  Gantt Chart

Budget

Item	# of Units: Estimated	# of Units: Actual	Unit Price: Estimated	Unit Price: Actual	Total Price Estimated	Total Price: Actual (Including Shipping)
Arduino (Link)	1	1	$22.00	$0.00 (Provided by TA)	$22.00	$0.00
Transistors (Link)	10		$0.06		$0.60	$0.00 (Provided by TA)
LED (strips - 6ft) (Link)	1	1	$21.99		$21.99
Arduino Microphone (Link)	10	10	$0.88	$0.69	$8.88	$6.90
Table (Link)	1	1	$39.99	$39.99	$39.99	$43.86
Capacitive Touch Sensors (Link)	-	5	-	$1.40	-	$6.99
Total	14				$48.78

Design And Solutions

Steps to Build the EBOX

1. Program the color patterns

2. Upload the code to the Arduino

3. Plug leads into the hardware

4. Solder external power source to lights and Arduino

5. CAD box to hold the hardware

6. Assemble table

7. Secure lights around the underside of the table

8. Plug in power source adapter to an outlet, place a speaker near the microphone, and enjoy!

Components

LED Light Strip (6ft)

Arduino Uno

Capacitive touch sensor

Sound Detection Sensor Module (Microphone)

Desk with glass or translucent top

5V Power adapter

Leads (wires)

The Software

The method of approach in terms of software was to program the Arduino to do a running average of the frequencies coming in from the Fast Fourier Transform and send a message to the LED strip to output a certain pattern of lights.

A Fourier Transform is a transformation of a function of time into the frequencies that make it up, but a Fast Fourier Transform is an algorithm that computes the same result but in nlogn time rather than n^2 by factorizing the discrete Fourier transform matrix into a product of mostly zeros. We downloaded a Fast Fourier Transform Library (referecne/link library) from an open source to translate the analog sound signals into digital signals with this decrease complexity to allow for a quick response to the audio input. Music or other forms of audio are inputted to the system through the Arduino microphone and the Arduino is programmed to take those anolog signals into the FFT (Fast Fourier Transform) operations and the output is series of frequencies in the range of 0-720.

The Electronics

The parts included in the electical component of the system are the LED strip, the capacitive touch sensor, and the external power source. The LED strip was a 6ft strip of individually addressable LED lights. This was important especially for the coding aspect in that we had to specify which light on the strip would be assigned a certain color making up the dynamic color patterns. The capacitive touch sensor serves as our user interface and allows the user to change the mode of the lights by a light touch.

• 

  Electrical Diagram

Results

Poster

• 

  Poster

External Links

Project Proposal Presentation Powerpoint Link

Code Repository

References

• https://sites.wustl.edu/ese498vertigodancefloor/ (Move to the Groove Reference)

Software References

• https://github.com/kosme/arduinoFFT (Arduino FFT library)
• https:/ing /forum.arduino.cc/index.php?topic=427386.0 (Arduino FFT discussion page)
• https://www.norwegiancreations.com/2017/08/what-is-fft-and-how-can-you-implement-it-on-an-arduino/ (Arduino FFT tutorial)
• https://playground.arduino.cc/Code/Filters (Real Time Digital Signal Processing Library)
• https://www.instructables.com/id/Arduino-Audio-Input/ (Tutorial to take in audio for FFT ~40KHz)
• https://www.instructables.com/id/Arduino-Frequency-Detection/ (Tutorial to analyze in audio for FFT ~40KHz)
• https://www.instructables.com/id/Arduino-Audio-Output/ (Tutorial to output audio for FFT ~40KHz)
• https://www.youtube.com/watch?v=NQinj-tlU-M (LED coding walkthrough)
• https://www.arduino.cc/reference/en/ (Arduino Language Reference)
• https://www.youtube.com/watch?v=5oRir4dck_w (ARDUINO LED LIGHTS WORK AND ARE SOUND RECEPTIVE (with opensource code))
• http://genericnerd.blogspot.com/2009/05/arduino-mood-light-controller.html (Tutorial, LED color transitions)
• https://www.instructables.com/id/Sound-Reactive-LED-strip/ (Simple version of our project)
• https://www.youtube.com/watch?v=e1FVSpkw6q4 (Simple tutorial, make LEDs dance)

Electrical Design References

• https://www.amazon.com/DAOKI-Sensitivity-Microphone-Detection-Arduino/dp/B00XT0PH10 (purchased microphone)
• https://randomnerdtutorials.com/guide-for-microphone-sound-sensor-with-arduino/ (Guide for microphone sound sensor)
• https://www.allaboutcircuits.com/technical-articles/introduction-to-capacitive-touch-sensing/ (Understanding Capacitive Touch Sensors (Self-Capacitance Configuration))
• http://henrysbench.capnfatz.com/henrys-bench/arduino-sensors-and-input/catalex-ttp223b-arduino-capacitive-touch-sensor-tutorial/ (Tutorial Capacitive Touch Sensor Arduino)
• https://www.instructables.com/id/Wire-a-Potentiometer-as-a-Variable-Resistor/ (Potentiometer, Variable Resistor)
• https://www.instructables.com/id/How-to-use-OLED-display-arduino-module/ (Tutorial LED display)
• https://www.instructables.com/id/Sound-Reactive-LED-strip/ (Simple version of our project)
• https://www.youtube.com/watch?v=e1FVSpkw6q4 (Simple tutorial, make LEDs dance)

Physical Design References

• https://www.youtube.com/watch?v=kj-oZgmRB2w&t=73s (OnShape Tutorial)
• https://www.youtube.com/watch?v=pMWnsHpDlQE&t=18s (OnShape Tutorial)
• https://www.youtube.com/watch?v=OasbgnLOuPI (HOW TO BUILD THE TABLE AND INTEGRATE THE LEDS)

eBOX Log https://classes.engineering.wustl.edu/ese205/core/index.php?title=EBOX_Log