Project

# Title Team Members TA Documents Sponsor
50 Hip Hop Xpress - Audio Synchronized LED Party Lighting
Kowei Chang
Oluwatosin Akinsanya
Paul Donnelly
William Zhang design_document1.pdf
final_paper1.pdf
proposal1.pdf
Names & NETID - Kowei Chang [koweic2], Paul Donnelly [pauld2], Oluwatosin Akinsanya [oakins2]

Title - Synchronized Music-LED Lighting System (we can change it)

Problem Statement - The Hip Hop Xpress buses have been a symbol of African-American music and history in the Champaign-Urbana area for years. From introducing new emerging DJ music technologies in under-resourced parts of the community to displaying African-American music legends, the bus prototypes remains a fusion of African-American art and technology. The “Double Dutch Boom Bus” is the third iteration of the Hip Hop Xpress, however, this project is headed by individuals that lack expertise in electrical and electronics applications. We will be installing an LED lighting system that is synchronized with the pitch of the music playing. The colors and lighting patterns of the LED system will be automated to provide a beautifully synchronized musical experience.

Solution Overview - The solution will be a LED lighting system that is safe and low-voltage around the exterior and potentially the interior of the bus. A potential Bluetooth mobile application can be used to remotely control the different lighting modes of the bus. The incoming audio signals will be processed by a state variable filter to isolate different frequencies. The isolated frequencies of the audio signals will be used by an ARM microcontroller to control the LEDs to change color and brightness.

Solution Components - ARM microcontroller - The memory will store the LED programs and using the integrated A to D converter we can measure the level of the bass signal and define triggers to change colors of lights.

State Variable Filters - This circuit contains op-amps, resistors, and capacitors. This is used to isolate the audio signals that each string of LEDs will work with.

Android App (maybe) - Ideally we can have app control overpowering the lighting system on/off, and possibly to choose the LED programs to run.

Criterion For Success - The Hip Hop Express will be “lit” (pun intended) by colorful LEDs inside and out, in order to promote a fun, high energy, party atmosphere for the members of the community that gather around the bus. We want some of the LEDs to change color along with the bass of the current song being played.

Habit-Forming Toothbrush Stand

John Kim, Quinn Palanca, Rahul Vasanth

Habit-Forming Toothbrush Stand

Featured Project

I spoke with a TA that approved this idea during office hours today, and they said I should submit it as a project proposal.

# Habit-Forming Toothbrush Stand

Team Members:

- Rahul Vasanth (rvasant2)

- Quinn Andrew Palanca (qpalanc2)

- John Jung-Yoon Kim (johnjk5)

# Problem

There are few habits as impactful as good dental hygiene. Brushing teeth in the morning and night can significantly improve health outcomes. Many struggle with forming and maintaining this habit. Parents might have a difficult time getting children to brush in the morning and before sleep while homeless shelter staff, rehab facility staff, and really, anyone looking to develop and track this habit may want a non-intrusive, privacy-preserving method to develop and maintain the practice of brushing their teeth in the morning. Keeping track of this information and but not storing it permanently through a mobile application is something that does not exist on the market. A small nudge is needed to keep kids, teenagers, and adults of all ages aware and mindful about their brushing habits. Additionally, many tend to zone out while brushing their teeth because they are half asleep and have no idea how long they are brushing.

# Solution

Our solution is catered toward electric toothbrushes. Unlike specific toothbrush brands that come with mobile applications, our solution applies to all electric toothbrushes, preserves privacy, and reduces screen time. We will implement a habit-forming toothbrush stand with a microcontroller, sensors, and a simple LED display that houses the electric toothbrush. A band of sensors will be wrapped around the base of the toothbrush. Lifting the toothbrush from the stand, turning it on, and starting to brush displays a timer that counts seconds up to ten minutes. This solves the problem of brushing too quickly or losing track of time and brushing for too long. Additionally, the display will provide a scorecard for brushing, with 14 values coming from (morning, night) x (6daysago, 5daysago, . . . , today) for a "record" of one week and 14 possible instances of brushing. This will augment the user's awareness of any new trends, and potentially help parents, their children, and other use cases outlined above. We specifically store just one week of data as the goal is habit formation and not permanent storage of potentially sensitive health information in the cloud.

# Solution Components

## Subsystem 1 - Sensor Band

The sensor band will contain a Bluetooth/Wireless Accelerometer and Gyroscope, or Accelerometer, IR sensor (to determine height lifted above sink), Bluetooth/Wireless connection to the microcontroller. This will allow us to determine if the electric toothbrush has been turned on. We will experiment with the overall angle, but knowing whether the toothbrush is parallel to the ground, or is lifted at a certain height above the sink will provide additional validation. These outputs need to be communicated wirelessly to the habit-forming toothbrush stand.

Possibilities: https://www.amazon.com/Accelerometer-Acceleration-Gyroscope-Electronic-Magnetometer/dp/B07GBRTB5K/ref=sr_1_12?keywords=wireless+accelerometer&qid=1643675559&sr=8-12 and individual sensors which we are exploring on Digikey and PCB Piezotronics as well.

## Subsystem 2 - Toothbrush Base/Stand and Display

The toothbrush stand will have a pressure sensor to determine when the toothbrush is lifted from the stand (alternatively, we may also add on an IR sensor), a microcontroller with Bluetooth capability, and a control unit to process sensor outputs as well as an LED display which will be set based on the current state. Additionally, the stand will need an internal clock to distinguish between morning and evening and mark states accordingly. The majority of sensors are powered by 3.3V - 5V. If we use a battery, we may include an additional button to power on the display (or just have it turn on when the pressure sensor / IR sensor output confirms the toothbrush has been lifted, or have the device plug into an outlet.

# Criterion For Success

1. When the user lifts the toothbrush from the stan and it begins to vibrate (signaling the toothbrush is on), the brushing timer begins and is displayed.

2. After at least two minutes have passed and the toothbrush is set back on the stand, the display correctly marks the current day and period (morning or evening).

3. Track record over current and previous days and the overall weekly record is accurately maintained. At the start of a new day, the record is shifted appropriately.

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