RFID AC SWITCH Final Presentation November 25, 2008

Team Members Ricardo Calderon Electrical Engineering Team Leader Dimmer Function Debugging Website Jonathan Stanley Electrical Engineering Research and Documentation Soldering Parts on PCB Website Design Jerome Walker Computer Engineering Research and Documentation Eagle Schematic Design Website Design Corey Tate Electrical Engineering Research and Documentation Eagle Schematic Design

Overview Introduction Problem Solution Technical/Practical Constraints Testing Final Product Bill of Materials Questions

Introduction What is RFID? How can RFID technology be used? –Inventory Control –Personal Access

Problem There are no OEM RFID AC Switches available. Many people are unfamiliar with the capability RFID Technology.

Solution OEM RFID AC Switch This will give manufacturers a quicker time to market.

Implementations How can our OEM RFID AC Switch be implemented? Light Control Security Access Outlet Control

Technical Constraints NameDescription Switching VoltageMust operate at 120 VAC. Output CurrentMust have a maximum current of 15 amperes. Read DistanceMust have a read distance of at least 2”. Authorized Tag Identification Must read 125kHz tags. Tag QuantityMust store at least 200 identification tags.

Technical Constraints Results Switching Voltage Pass Output Current Pass Read Distance Pass Authorized Tag Identification Pass Tag Quantity Pass

Practical Constraints TypeNameDescription ManufacturabilitySizeMust have dimensions of at most 4” in length, 4” in width, and 2” in depth. Health and SafetySafetyMust meet UL (Underwriters Laboratories) guidelines.

Practical Constraints - Manufacturability Dimensions must be a maximum of 4”x4”x2” Solutions –AC/DC Converter –TRIAC –PCB Layout

Practical Constraints - Safety Must meet UL Guidelines Solutions –Non-conducive Enclosure –Isolated External Connections –Overcurrent Protection

Practical Constraints Results Dimensions (4”x4”x2”) Pass UL Guidelines Pass

Testing Format (Erase) Erase 1 Tag Write (Store) Read (Toggle) R (Timer 5s) R (Timer 10s) R (Dim Up/Down) R (Dim Up) R (Dim Down) R (Dim %)

Test Plan Erase Mode Write Mode Read Mode

Erase Mode Erase Modes –Erase all stored tags –Erase 1 tag at a time –Output debug messages on Hyperterminal

Format/Erase Test

Erase 1 Tag Test

Write Mode –Store tag ID in memory –Same tag ID can only be stored once –Output debug messages on Hyperterminal

Write/Store Tag Test

Read Mode Read Modes –Toggle –Timer 5s/10s Timer –Dimmer DU, DD, DU&DD, DS

Toggle - Sunny Day Test

Toggle - Rainy Day Test

Timer 5s & 10s Test Timer 5s Test Timer 10s Test

Dimmer VDC Oscilloscope Green - Zero Crossing Yellow – Output 100%, 75% 50%, 25%, 0%

Dimmer VAC Oscilloscope Green - Zero Crossing Yellow – Output 100%, 75% 50%, 25%, 0%

SDI vs. SDII Senior Design ISenior Design II

Final Product No Need to house since product is OEM Size: 3.93”x3.15”x2” Read Range: 3”

Examples Input Output

Bill of Materials DeviceCost RFID Reader$34.95 AC/DC Converter$10.90 TRIAC Circuit$2.99 Microcontroller Circuit$9.55 Dimmer Chip$0.53 USB Input Circuit$15.96 Total Cost:$74.88

Questions Questions??