1 Wireless LED Display ECE4007-L03 Mekre Mesganaw Mark Reed Paul Simmons Chris White April 16, 2009

2 Project Overview Transmit RSS feeds wirelessly to an LED display Fill a market gap for a flexible information display system Estimate development costs at $185,000 and sale price at $1,100

3 Design Features Scrolling LED matrix display Modular design Bluetooth connectivity Multiple sources –RSS (Really Simple Syndication) feeds –Text files –Time Computer controlled via GUI

4 Table of Specs AttributeProposedImplemented Number of RSS Feeds3unlimited Number of Articles1015 Text File Size1 kb1.25kb Number of modular boards2 or 34 LED Screens per board88 Wireless connectivity range30 m number of scrolling speeds33 board dimensions12'' x 2''12'' x 3''

5 System Block Diagram

6 Cypress CY3210 Evaluation Kit Cypress CY8C PXI Programmable System-on- Chip (PSoC) I 2 C interface Serial port connectivity 2 KB onboard memory

7 Promi SD-101 Bluetooth Adapter Serial to USB Bluetooth Adapter Up to 30m range Automatic pairing mode Transparent serial connectivity for devices

8 MAX6953 LED Driver Chip 40 pin DIP I 2 C interface 16 chips per bus Four 5x7 grid control ASCII character support

9 LTP 2057AKR LED Display 5 x 7 LED matrix 2 inches by 1.5 inches Red mono-color

10 Power Considerations LED Arrays 5V supply 1.1 Amps average 2.5 Amp Fuse PSoC 9V supply for PSoC 500 mA onboard regulator

11 Modularity Eight characters per board Boards connected through header pin interconnects for variable lengths Eight boards connected to single I 2 C bus Processor updates as new boards attached

12 Graphical User Interface Local web browser interface Scroll speed options Display options Time Text file RSS news headlines

13 Software Implementation Computer Side –ASP.net –Packets PSoC Side –C programmed –Memory storage

14 Problems Serial interface transmission errors PSoC memory allocation limitations LED power requirements Wireless adaptor battery life

15 Alternatives Max 6952 Dedicated PIC onboard Wi-Fi Connectivity Individual LEDs

16 Improvements Software reset Automatic refresh setting Reinforced board interconnects Server-based control Authentication Power distribution system

17 Financial Analysis $ for control module, software and one LED board $ per expansion board Expected profit of $1.1 million over 5 years