ECE Senior Design Project

1. ECE Senior Design Project Bo Li, John Rhine, Naixing Wang Spring 2008 Team 23

2. Project Introduction Static System Overview Mobile System Overview Final Thoughts/Next Steps Agenda

3. Project Overview Misplacing important objects (cell phone, keys, wallet) is an everyday occurrence Finding lost objects require a lot of time and cause a lot of frustration Situation • What design will allow for affordability and portability? • What is the best design that allows the product to be user friendly? • How do we test the system to ensure accuracy? • How do we program the PIC efficiently to be able to handle all the information? Key Questions • Current products are not designed to be implemented in a home environment • The system has many parts and can be hard to work with Complication

4. Executive Summary Our design consists of 2 distinct parts Static system is long range locator allowing the user know which objects are in which room Mobile system allows for short range detection while in that room All of the individual parts of our project worked (RFID reader, static system wireless, mobile system) When combined together, the RFID reader would not interact properly with the wireless system Potential problem with the amount of information able to be stored on a PIC Problems with the initial reader left us little time to optimize new reader RFID reader reads the tags of the objects in the room Reader transmits the data, and the receiver lights up LEDs for the objects in that room User takes mobile remote to the room and presses the corresponding button The object will sound a beep, allowing the user for easy locating

5. Agenda Project Introduction Static System Overview RFID Reader Wireless Component Mobile System Overview Final Thoughts/Next Steps

6. RFID Reader Hardware RFID Reader, Antenna and corresponding circuit Connection to Hyperterminal

7. RFID Reader Testing Output of command to read a tag

8. RFID Reader Output Output of detection of 1 tag Output of detection of 4 tags

9. RFID Reader Hardware Reader picking up 1 tag from above Reader picking up 2 tags from the side

10. RFID System Testing

11. Range Limitations Range limited to one meter Not acceptable for original design Design modification Track objects upon entrance of room Drawbacks of new design Some homes have multiple entrances to rooms Objects have to be tracked by PIC software for longer durations of time Optimal Door Placement 4 ft above ground as close to door as possible with main beam perpendicular to the plane of the door

12. Static System Transmitter Schematic

13. Static System Wireless Hardware Transmitter attached to the power supply Receiver circuit after receiving object 5

14. Static System Receiver Schematic

15. RFID Reader Software Overview Initialize all tags to off Determine if system is on Yes No Loop command for reader to read the tags Do nothing Get the tag ID# and store the last 4 bits Determine which tag is present based on the last 4 bits and set that tag = 1 Determine if user resets the system

16. Static System Transmitter Software Overview Determine if any of the objects have been set to 1 (information from the RFID reader) Yes No Transmit 00100 to indicate start of packet Transmit 0, 0, 0 Check objects 1-7 in order and transmit the binary number of the tags set to 1 with an additional leading 1 (ie 5 is 1101) Set all objects to 0

17. Static System Receiver Software Overview Determine if new packet is starting Yes (100) No (else) All LEDs to off Previous display remains Determine if start of new object No (0) Yes (1) Determine the decimal number of the binary bits sent by the transmitter (ie 101 = 5) Light up the LED corresponding to that decimal number

18. Static System Wireless Testing Transmitter LED1 Transmitter sending 1001 to the receiver, which lights up LED1

19. Static System Wireless Testing Transmitter LED3 Transmitter sending 1011 to the receiver, which lights up LED3

20. Agenda Project Introduction Static System Overview Mobile System Overview Final Thoughts/Next Steps

21. Mobile System Hardware Transmitter with switch connected to battery Receiver connected to a battery

22. Mobile System Schematic

23. Mobile System Testing

24. Agenda Project Introduction Static System Overview RFID Reader Wireless Component Mobile System Overview Final Thoughts/Next Steps

25. Lessons Learned When facing a road block, sometimes the best plan is to travel down a different road We should have switched readers weeks in advance, instead of trying to figure out the documentation of a reader that was not working Implement the simplest parts of the project first before moving on the harder parts Simple parts of the circuit provide small victories that can spur momentum Working with a team can produce friction, but can provide greater results through synergy

26. Next Steps There are many improvements that can be made to the design of our project in order for it to be marketable Instead of using the Skyetek RFID Reader, a long-range system must be put in place as the static system While an LED display works and is easier to implement, an LCD display is more user friendly and can give more detailed descriptions The mobile system must have a longer battery life so that the user does not need to replace the batteries every other day The mobile system also needs to be able to distinguish which object the user wants to locate, potentially sending out a different frequency for each object

27. Thank Yous Thank you to all that helped in the progress of our project Professor Gary Swenson Purvesh Thakker ECE Parts Shop