RFID AC SWITCH Mid-Term Presentation September 30, 2008

Team Members Ricardo Calderon Electrical Engineering Team Leader Research and Documentation RFID Reader PIC Programming Website Design Jonathan Stanley Electrical Engineering Research and Documentation Power Supply TRIAC Control Website Design Jerome Walker Computer Engineering Research and Documentation PIC Programming Website Design Corey Tate Electrical Engineering Research and Documentation Power Supply TRIAC Control

Overview Introduction Problem Solution Technical/Practical Constraints Test Plan Schematics/Packaging Future Work 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 the RFID AC Switch be used? –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 From SD1 Switching Voltage Pass Output Current Pass Read Distance Fail Authorized Tag Identification Pass Tag Quantity Pass

Technical Constraint Read Distance SD1 Max Read Distance 1.50” Solution: - Upgrade from ID-12 to ID-20 Reader

Technical Constraints Results from SD2 Switching Voltage Pass Output Current Pass Read Distance Questionable 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

SD2 Addition 2 Methods to Implement Dimmer Function –Dimmer Mode using Potentiometer –Dimmer Mode using PWM

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%

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

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

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

Schematics RFID PIC RS-232

Schematics AC/DC Converter TRIAC Circuitry

Packaging 4” 2” ComponentQuantity 3-Wire Connector 2 Mode Switch3 Debug Port1 LED5

Future Work Order PCB Modify Project Case Solder Components on PCB Test Completed PCB

Questions Questions??