Project
| # | Title | Team Members | TA | Documents | Sponsor |
|---|---|---|---|---|---|
| 17 | LED Persistence of Vision Globe |
Gavi Campbell Melvin Alpizar Arrieta Owen Bowers |
Gayatri Chandran | design_document1.pdf design_document2.pdf other1.pdf |
|
| # Team: Globetrotters (WIP) # Team Members: - Owen Bowers (obowers2) - Melvin Alpizar Arrieta (malpi2) - Gavriel Campbell (gcampb7) # Problem LabEscape at UIUC is a popular attraction during events such as Engineering Open House and as such is constantly looking for ways to improve their exhibit. One such improvement they are looking to make is the implementation of a LED Globe capable of displaying messages and images via the utilization of something called persistence of vision. However, many issues can arise when trying to construct a functional system to utilize this phenomenon including mechanical, timing, and electrical restrictions. A couple examples of the problems that may be encountered are as follows: Difficulty in the creation of an electrical system that functions within a rapidly spinning environment. Difficulty acquiring proper live measurements of the systems spin rate. Difficulty translating spin rate into signals at proper time intervals for the entirety of the LED strip across the arch. Difficulty ensuring proper resolution for crisp imaging. Difficulty ensuring stability of the structure due to weights of parts. This problem is emphasized when applied to spinning objects. Additionally to all the above mentioned crucial issues to consider, there are a number of aesthetic issues that should be addressed. Namely, the noise of such a device should ideally be as little as possible and the color spectrum be as large as able. # Solution In order to address the many problems one could encounter when trying to build a system of this kind we plan to take the following measures. We will implement systems capable of acquiring the correct spin rate of the device, taking into account information from accelerometers, optical sensors, and the assumed spin rate of components. We will include a number of LED’s sufficient to provide clear and crisp images across the entirety of the spin radius. We will strive to manage external wiring and focus on keeping all relevant wiring components contained to the PCB board to ensure that wires will not tangle the device and result in catastrophic failure. To solve balancing issues we intend to create a tri-pylon approach where there will be three identical arches spaced around the structure to ensure that balance is maintained. Additionally we will ensure that PCB are spaced properly to distribute weight evenly. This design could be expanded to make use of an RGB coloring system to allow for multicolored display. ## Subsystem 1 - Power Unit A 5 volt power unit will allow for the safe operation of our LED’s avoiding risk of burnout. A wired power source system (DC 12V) and conversion to lower voltage for when it is desired for the device to run for extended periods of time. A mobile battery pack that can be utilized when mobility is desired. ## Subsystem 2 - Motor A DC motor capable of rotating at least 600 rpm should be more than satisfactory for the goal we wish to achieve in this project. WIll be able to rotate the mass of our globe for extended periods of time without wearing out. ## Subsystem 3 - Microprocessor Room for additional features should we wish to expand the scope of our project (such as perhaps the addition of a speaker). Capability to route all our necessary components with ease and the ability to accommodate additional power if needed. Our Microprocessor will allow for WIFI and bluetooth connectivity capabilities. ## Subsystem 4 - Accelerometer/Rotational Sensors An accelerometer to gather experimental data of the current rotational speed of the LED globe An optical sensor will be used with a reference point to verify the correct rotational speed of the globe. Alternatively a hall-effect sensor can be used to magnetically detect rotations and adjust light timing accordingly. ## Subsystem 5 - Multi-Colored LED Band(s) Balanced LED spacing around the PCB core to ensure the smooth rotation of our globe and avoiding turbulence. Reliable and fast acting LED’s not prone to burnout when activated actively and continuously. Bands of interconnected LED’s capable of a single or multiple colors. ## Subsystem 6 - Data Input An SD card reader or item of a similar nature that can accept physical information and display in a sequential order. Support for wireless data transfers to accomplish data displays without the necessity to stop and load the device. Support for an approachable user interface in which displays can be freely edited and changed wirelessly. ## Subsystem 7 - Web Application Will provide a user-friendly method to control the LED Globe Will allow users to upload media files (images, videos, gifs) directly from their device to the globe The web interface will connect to the globe via onboard WiFi/Bluetooth for seamless control. Password protection or local hosting will restrict access so only authorized users can make changes. # Criterion For Success This project will be successful if we meet the following criteria: High resolution displayable text and imaging. Continuous correct functioning for 12 hours when on battery power. Wireless Customizable Graphics. |
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