Project

# Title Team Members TA Documents Sponsor
26 Controllable Voltage Rechargeable Battery Pack with Battery Management Display
 Javier Santiago Lara
Jeffrey Zhu
Mason Randle
 Zipeng Wang design_document0.pdf
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other0.sch
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proposal0.pdf
Group Members:

Jeffrey Zhu(jzhu46)
Javier Santiago (javiers2)
Mason Randle (mrandle2)

General Description:

We would like to create a general purpose power pack with the following features: Can be recharged from AC or DC power sources at a range of voltages. Can discharge AC or DC power at a range of voltages, The user will be able to adjust the output voltage. Will have case mounted solar panels so that the power pack can recharge itself. Will have a built in battery management system with screen display to indicate charge level, voltage input/output, and current input/output.

What makes the project unique:

This power pack combines technologies to create features not found in other battery packs. Most battery packs, for instance, do not have a display to indicate charge level and power flow. This will allow the user to know the power they are drawing and the energy remaining without external measuring equipment. Further more, the power pack's ability to receive/provide both AC and DC power will save the user from having to add-on external power converters for each different source or load. Finally, the solar cells are provided as a last ditch solution if no charging source is available.

Competitors/Alternatives:

Our competitors would be existing battery packs. However, most of these battery packs are little more than batteries packed together in some configuration. They lack the flexibility and user-friendliness of the system we are proposing

Technical Overview:

A pack of rechargeable batteries connected in parallel will form the core of the pack. We will have three DC-DC switching converters, one for the input, one for the output, and one for the case-mounted solar cells. We will also have a rectifier on the input and an inverter on the output. In addition to our power converters, we will have in-built wattmeters and a microprocessor to interface with the display screen.

UV Sensor and Alert System - Skin Protection

Liz Boehning, Gavin Chan, Jimmy Huh

UV Sensor and Alert System - Skin Protection

Featured Project

Team Members:

- Elizabeth Boehning (elb5)

- Gavin Chan (gavintc2)

- Jimmy Huh (yeaho2)

# Problem

Too much sun exposure can lead to sunburn and an increased risk of skin cancer. Without active and mindful monitoring, it can be difficult to tell how much sun exposure one is getting and when one needs to seek protection from the sun, such as applying sunscreen or getting into shady areas. This is even more of an issue for those with fair skin, but also can be applicable to prevent skin damage for everyone, specifically for those who spend a lot of time outside for work (construction) or leisure activities (runners, outdoor athletes).

# Solution

Our solution is to create a wristband that tracks UV exposure and alerts the user to reapply sunscreen or seek shade to prevent skin damage. By creating a device that tracks intensity and exposure to harmful UV light from the sun, the user can limit their time in the sun (especially during periods of increased UV exposure) and apply sunscreen or seek shade when necessary, without the need of manually tracking how long the user is exposed to sunlight. By doing so, the short-term risk of sunburn and long-term risk of skin cancer is decreased.

The sensors/wristbands that we have seen only provide feedback in the sense of color changing once a certain exposure limit has been reached. For our device, we would like to also input user feedback to actively alert the user repeatedly to ensure safe extended sun exposure.

# Solution Components

## Subsystem 1 - Sensor Interface

This subsystem contains the UV sensors. There are two types of UV wavelengths that are damaging to human skin and reach the surface of Earth: UV-A and UV-B. Therefore, this subsystem will contain two sensors to measure each of those wavelengths and output a voltage for the MCU subsystem to interpret as energy intensity. The following sensors will be used:

- GUVA-T21GH - https://www.digikey.com/en/products/detail/genicom-co-ltd/GUVA-T21GH/10474931

- GUVB-T21GH - https://www.digikey.com/en/products/detail/genicom-co-ltd/GUVB-T21GH/10474933

## Subsystem 2 - MCU

This subsystem will include a microcontroller for controlling the device. It will take input from the sensor interface, interpret the input as energy intensity, and track how long the sensor is exposed to UV. When applicable, the MCU will output signals to the User Interface subsystem to notify the user to take action for sun exposure and will input signals from the User Interface subsystem if the user has put on sunscreen.

## Subsystem 3 - Power

This subsystem will provide power to the system through a rechargeable, lithium-ion battery, and a switching boost converter for the rest of the system. This section will require some consultation to ensure the best choice is made for our device.

## Subsystem 4 - User Interface

This subsystem will provide feedback to the user and accept feedback from the user. Once the user has been exposed to significant UV light, this subsystem will use a vibration motor to vibrate and notify the user to put on more sunscreen or get into the shade. Once they have done so, they can press a button to notify the system that they have put on more sunscreen, which will be sent as an output to the MCU subsystem.

We are looking into using one of the following vibration motors:

- TEK002 - https://www.digikey.com/en/products/detail/sparkfun-electronics/DEV-11008/5768371

- DEV-11008 - https://www.digikey.com/en/products/detail/pimoroni-ltd/TEK002/7933302

# Criterion For Success

- Last at least 16 hours on battery power

- Accurately measures amount of time and intensity of harmful UV light

- Notifies user of sustained UV exposure (vibration motor) and resets exposure timer if more sunscreen is applied (button is pressed)