Project

# Title Team Members TA Documents Sponsor
7 SolarTrack
Rahul Patel
Rishikesh Balaji
Siddhant Jain
Haocheng Bill Yang design_document1.pdf
final_paper1.pdf
photo1.jpeg
photo2.jpeg
presentation1.pdf
proposal1.pdf
video
Problem:

Fixed solar panels waste potential energy due to changing sun positions and limited monitoring,

Solution:

This project proposes the design of a self positioning solar panel system that automatically orients itself to capture the maximum possible solar energy throughout the day and stores that energy in a battery. Unlike fixed panels the system continuously adjusts its angle using light sensors or a sun-position algorithm controlled by a microcontroller, ensuring the best alignment with the sun as conditions change. The harvested energy is routed through a charge controller to safely charge a battery while protecting against overvoltage, overcurrent, and deep discharge. In addition to energy generation and storage, the system includes a mobile or web application that displays real time and historical data such as panel voltage and current, total energy generated (Wh), battery state of charge, system efficiency, and power consumption of connected loads. This application allows users to monitor performance, compare tracked versus fixed operation, and understand how environmental conditions impact energy production.

Solution Components:

Dual Axis Tracking Mechanism

The solar panels will be mounted on a two axis articulating frame that is driven by servo and stepper motors. This will allow independent control of both the east to west orientation, as well as the angle at which the solar panels are mounted. This will enable the panels to follow the sun’s path through the day across the sky.

Light Sensor Array

We will use an array of photodiodes or LDR sensors to detect the light intensity in various positionings in order to determine the most optimal position for the panels. We could also implement an algorithm that calculates the sun’s theoretical position based on GPS coordinates for use during cloudy or partially shaded conditions.

Maximum Power Point Tracking Charge Controller

We will make use of a charge controller to interface between the solar panel and the battery to operate at the maximum power point. This will help us protect the battery from over charging, over discharging, and reverse current flow.

Energy Storage and Management System

We will incorporate voltage and current senors to measure the output from the panels, battery charge/discharge rates, and load consumption. We will make use of these measurements to compute realtime power, cumulative energy, and system efficiency for performance analysis.

Wireless Communication Module

We will use a WiFi communication module to send system data to a local server or even a cloud based server. This will allow remote monitoring, firmware updates, and long term data logging for performance analysis of tracked and fixed-tilt operations.

Mobile/Web Application Dashboard

We will use an application that will visualize live and historical metrics, including but not limited to orientation angles, power output, energy yield, and tracking efficiency. With the help of this application, users will be able to analyze trends, receive fault alerts, and evaluate the energy gained from solar tracking under different environmental conditions.

Criteria for success:

The success of this project will be evaluated under the following criteria.

Wi-Fi connection between the solar panel/battery and a local/cloud server.

Tracking of statistics, such as angle, output, etc... for display later.

A cache in which to store tracked statistics should the server be unavailable.

Creation of a web app to display the tracked statistics.

Creation of an algorithm allowing for the solar panel to "follow" the sun.

Integration of the algorithm onto a microcontroller + interfacing with light sensors and motors.



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)