# Title Team Members TA Documents Sponsor
67 Toothbrush Alarm
Carl Xu
Eric Lin
Laurenz Nava
Zicheng Ma design_document2.pdf
# Toothbrush Alarm

Team Members:
- Eric Lin (yulin4)
- Carl Xu (zx32)
- Laurenz Nava (lfnava2)

# Problem

Waking up early in the morning is a challenge that many people face, and conventional alarms often fail to provide an effective solution. Despite setting multiple alarms, people find themselves consistently oversleeping, waking up significantly later than intended. This issue can lead to a range of negative consequences, including disrupted daily schedules, reduced productivity, and increased stress. Traditional alarms tend to lack the ability to ensure that a person not only wakes up but also gets out of bed and starts their day. This is particularly problematic for those with a heavy sleeping pattern or a habit of snoozing alarms.

# Solution

To address this issue, our idea is to create a Toothbrush Alarm. The concept involves an alarm that persists until you get up and spend, for example, 3 minutes brushing your teeth. Once the toothbrushing routine is complete, the alarm automatically stops. This not only ensures a timely wake-up but also promotes a refreshed start to the day after engaging in the morning teeth-cleaning ritual.

# Solution Components

## Subsystem 1 – Toothbrush Dock

The dock will sense the proximity of the toothbrush, and how long the user’s been brushing their teeth. Once the user picks the toothbrush up and puts it down after more than 3 minutes, it will tell the alarm to turn off.

The dock will contain our PCB board to control the whole system.
Multiple pressure sensors are contained in a shape that perfectly matches the bottom of the toothbrush to detect if the toothbrush is docked.

The sensors will be at the bottom and side to ensure the object docked is the toothbrush, and the user is not fooling the dock with another object.

DF9-16 pressure sensor:

## Subsystem 2 – Miniature Accelerometer

To ensure the user brushes their teeth after picking up the toothbrush, the accelerometer will be used to detect whether the user is making appropriate teeth brushing movements. While it is possible to simply wave the toothbrush without actually brushing your teeth, the main purpose of the device is to wake up the user, and sufficient physical movement will help, regardless of if it is used to brush teeth or not.

The accelerometer will determine the force applied on the brush and how often it switches directions, so it can tell when the user is brushing their teeth


## Subsystem 3 - Alarm

The alarm is connected to the toothbrush dock, and it will stop ringing once the user picks up the toothbrush. However, if the user does not put it back into the dock after 5 minutes, it will restart the ring.

The alarm will be a speaker integrated into the dock, or can be wired into the user’s room to more effectively wake them up.

COM-11089 ROHS speaker:

## Subsystem 4 – Body Motion Sensor

A possible addition to the project for added complexity. It would detect the appearance of a new individual in the bathroom to further ensure the system works intended.

The motion sensor will be installed around the dock, facing the user to detect if they have entered the bathroom and continued present in the bathroom, ensuring they are not fooling the system.

HC-SR312 AM312 pir motion detector senses passive body infrared to make sure the moving object is a human.

HC-SR312 AM312 pir motion detector:

# Criterion For Success

1. Alarm will turn off after the user brushed their teeth for 3 minutes.

2. Toothbrush can detect if it is inside a human’s mouth.

3. Dock can detect if the toothbrush is present in the dock.

4. Dock can track how long the toothbrush is not present.

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:


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:

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