# Title Team Members TA Documents Sponsor
Chris Jurczewski
Noah DuVal
Norbert Lazarz
Nithin Balaji Shanthini Praveena Purushothaman design_document2.pdf
Team Members:
- nlazarz2
- nbduval2
- cmj7

# Problem

One problem with adjusting volume manually is that it's tedious and often causes changes in the tone of the amp. Another problem this poses is during live performances, when you would like guitars to be less or more prominent when playing different songs, there is no way for the player themselves to adjust themselves without relying on someone mixing during their set. Volume is also room dependent so changing locations will result in the volume being changed which can often be unwanted.

# Solution

To solve these problems we propose a pedal that will adjust the volume of the amp’s output depending on the chosen decibel setting located on the pedal. This project will have two subsystems that will work together to collect, process, and alter the output of the amp. The first subsystem is the pedal itself which will allow the user to select the desired dB setting they would like to hear. The second is the microphone attachment to the guitar which will collect auditory data from the amp and transmit it wirelessly to the pedal. After the pedal receives the signal it will filter out the unnecessary frequencies and bring the volume of the signal up to the preset number and keep that volume wherever the player is.

# Solution Components

## Pedal Subsystem

The pedal itself will contain the main PCB which will be in charge of taking in readings from microphones on the guitar. The microcontroller will then be programmed to filter the audio so there is as little noise as possible and will not consider frequencies outside a guitar’s range. It will then use these readings to determine the level of volume it tells the amp to output. This will be determined by averaging the sound over a certain period of time and bringing it up to the preset number on the pedal depending on the distance of the player.

- Possibly looking at using the ESP32-S3 Microcontroller due to its built in wifi and bluetooth capabilities that we would like to use to communicate between the microphone and custom pcb
- A multitude of resistors, capacitors and OpAmps to create an analog noise filter before the digital filter to remove general ambient noise.
- A 4.4mm jack is needed to connect the pedal to a guitar/amp

## Guitar Subsystem

On the front and back of the guitar will be wireless microphones that will pick up the outgoing sound from the amp and will send it to the first subsystem to be used for filtering and calculations.

- Will require some form of bluetooth microphone that will connect to the pedal
- Will need some form of external power and a way to easily attach and detach from a guitar

# Criterion For Success

- Audio is noticeably changed by the varying distance between player and amp
- Audio stays consistent for player and does not jump or stutter
- Audio does not change tone or effects created by other pedals or amp presets
- Pedal is not affected by frequencies outside it’s set range (80-1500 Hz)
-Internal components are relatively inexpensive

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: 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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