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 |
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| # 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) |
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