Project

# Title Team Members TA Documents Sponsor
69 Bluetooth Speaker with Motion-based Automated Volume Adjustment
Chirag Kikkeri
Dhruv Vishwanath
Raj Pulugurtha
Abhisheka Mathur Sekar design_document2.pdf
final_paper1.pdf
photo1.HEIC
photo2.HEIC
presentation1.pptx
proposal2.pdf
video1.pdf
# Bluetooth Speaker with Motion-based Automated Volume Adjustment

TEAM MEMBERS:
- Chirag Kikkeri (kikkeri2)
- Dhruv Vishwanath (dhruvv2)
- Raj Pulugurtha (rajkp2)

# PROBLEM
When driving and listening to music, oftentimes we want to change the volume based on the speed of the vehicle. For example, when moving at higher speeds, drivers will raise the volume to better hear the music, and when stopped at a stop light, will lower the volume significantly. This issue is a clear nuisance, but can also present a major safety hazard that takes the user’s concentration away from driving and to adjusting the volume, especially for drivers who do not use the car sound system. Outside of driving specifically, this is a problem for those who bike or skate with a speaker as well.

# Solution Overview
Our solution is to create a speaker that will automatically increase and decrease volume based on the speed that the speaker is moving. The speaker will be a portable Bluetooth speaker that the user can take in and out of the car. Users will also have the ability to set the minimum and maximum volumes to better personalize their listening experience. It will also contain a series of LEDs that tell the user the current volume. The speaker system will have two modes: one for when it is moving, and one for when it is stationary. When it is in the stationary mode, the user can increase and decrease volume with buttons. When it is in moving mode, the user will not be able to change the volume, so that the user focuses on driving.

# Solution Components:
## Subsystem #1: Power
- Description: This part of our project will be key to making the remainder of our project operable. In order to power our speaker and change volume levels when in the “moving mode”, we will need a battery to power it.
- Components: Lithium-ion battery, USB-based charging port

## Subsystem #2: Bluetooth Connection
- Description: Both the bluetooth module and bluetooth amplifier are essential for wireless communication between the speaker and a media device. Having both of these components allows our speaker to be more easily portable.
- Components: HC-05 Bluetooth Module, TDA7492P amplifier board

## Subsystem #3: Sensor System
- Description: Arguably the most essential subsystem for our project, the point of the sensor is to track changes in speed within our speaker so that it can use that information to adjust the volume of our speaker automatically based on a formula that we create (this formula will create a consistent change in volume values that correspond with the changes in speed). We plan on using an accelerometer sensor for this, which means we must also account for the fact that the sensor will only give us information regarding the speaker's acceleration, meaning we need to convert that to speed so that our speaker can properly change the volume. This system will be connected to the PCB in addition to the bluetooth amplifier so that there is a line of communication between our subsystems which will allow the PCB to make changes to the volume itself based on the information provided by the system.
- Components: Accelerometer sensor (https://www.amazon.com/HiLetgo-MPU-6050-Accelerometer-Gyroscope-Converter/dp/B00LP25V1A/ref=sr_1_3?keywords=accelerometer&qid=1675291981&sr=8-3&th=1)
Microcontroller: STM32F401RE Microcontroller

## Subsystem #4: Speaker System
- Description: The physical build of the speaker itself is very important to our project, as the aesthetic appearance of our product will be directly correlated to its assumed value and durability. To build the speaker itself, we will need the bluetooth technology (see above), in addition to the physical parts of the speaker that produce sound. Given the components below and wood, we would be able to ask the machine shop to put the parts together in a way that could complete the physical part of the speaker. With the case of the speaker completed, we can add the remaining subsystems to an empty part of the case and make the necessary connections for the speaker.
- Components: Woofer (https://www.parts-express.com/GRS-5PF-8-5-1-4-Paper-Cone-Foam-Surround-Woofer-292-405?quantity=1), speaker driver (https://www.parts-express.com/GRS-1TD1-8-1-Dome-Tweeter-8-Ohm-292-462?quantity=1), passive radiator (https://www.parts-express.com/Samsung-U083L03SSK1-3-Poly-Cone-Passive-Radiator-21-23-34-289-2362?quantity=1), audio crossovers (https://www.parts-express.com/Crossover-2-Way-8-Ohm-5-000-Hz-150W-260-198?quantity=1)

## Subsystem #5: User Interface
- Description: The last module is what the user will see on the outside surface of the speaker. The main things we want to have here are some buttons (on/off, switch between modes, min/max volume settings, bluetooth connection), as well as LEDs that are visible to the user so that they know what volume level they are currently using the speaker at.
- Components: Omron B3F switch, SparkFun Qwiic LED Stick (SparkFun Qwiic LED Stick - APA102C - COM-18354 - SparkFun Electronics)

# Criterion for Success
- The system is able to play music using Bluetooth connection
- The system is able to precisely adjust volume based on the readings of the accelerometer (same speed should result in same volume)
- The user is able to set min and max volumes and those volumes are not crossed
- The user is able to manually change volume when the system is in stationary mode

(For demoing in the lab, we will change our formula for changing volume such that a small change in speed, results in a large difference in volume)

Interactive Proximity Donor Wall Illumination

Sungmin Jang, Anita Jung, Zheng Liu

Interactive Proximity Donor Wall Illumination

Featured Project

Team Members:

Anita Jung (anitaj2)

Sungmin Jang (sjang27)

Zheng Liu (zliu93)

Link to the idea: https://courses.engr.illinois.edu/ece445/pace/view-topic.asp?id=27710

Problem:

The Donor Wall on the southwest side of first floor in ECEB is to celebrate and appreciate everyone who helped and donated for ECEB.

However, because of poor lighting and color contrast between the copper and the wall behind, donor names are not noticed as much as they should, especially after sunset.

Solution Overview:

Here is the image of the Donor Wall:

http://buildingcampaign.ece.illinois.edu/files/2014/10/touched-up-Donor-wall-by-kurt-bielema.jpg

We are going to design and implement a dynamic and interactive illuminating system for the Donor Wall by installing LEDs on the background. LEDs can be placed behind the names to softly illuminate each name. LEDs can also fill in the transparent gaps in the “circuit board” to allow for interaction and dynamic animation.

And our project’s system would contain 2 basic modes:

Default mode: When there is nobody near the Donor Wall, the names are softly illuminated from the back of each name block.

Moving mode: When sensors detect any stimulation such as a person walking nearby, the LEDs are controlled to animate “current” or “pulses” flowing through the “circuit board” into name boards.

Depending on the progress of our project, we have some additional modes:

Pressing mode: When someone is physically pressing on a name block, detected by pressure sensors, the LEDs are controlled to

animate scattering of outgoing light, just as if a wave or light is emitted from that name block.

Solution Components:

Sensor Subsystem:

IR sensors (PIR modules or IR LEDs with phototransistor) or ultrasonic sensors to detect presence and proximity of people in front of the Donor Wall.

Pressure sensors to detect if someone is pressing on a block.

Lighting Subsystem:

A lot of LEDs is needed to be installed on the PCBs to be our lighting subsystem. These are hidden as much as possible so that people focus on the names instead of the LEDs.

Controlling Subsystem:

The main part of the system is the controlling unit. We plan to use a microprocessor to process the signal from those sensors and send signal to LEDs. And because the system has different modes, switching between them correctly is also important for the project.

Power Subsystem:

AC (Wall outlet; 120V, 60Hz) to DC (acceptable DC voltage and current applicable for our circuit design) power adapter or possible AC-DC converter circuit

Criterion for success:

Whole system should work correctly in each mode and switch between different modes correctly. The names should be highlighted in a comfortable and aesthetically pleasing way. Our project is acceptable for senior design because it contains both hardware and software parts dealing with signal processing, power, control, and circuit design with sensors.

Project Videos