RFID AC SWITCH Final Presentation April 24, 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 Design Approach Hardware & Software Tests Completed Prototype Future Work Bill of Materials Questions

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

Problem There are no RFID AC Switches. 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.

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-Size RFID AC Switch must have dimensions of at most 4” in length, 4” in width, and 2” in depth Why? –Adaptability

Practical Constraints-Safety RFID AC Switch must meet UL (Underwriters Laboratories) guidelines How to meet these guidelines? –Proper Enclosure –Isolated Connections –Overcurrent Protection

Power Supply ID-12 RFID READERPIC18F2620 TRIAC Design Approach 5VDC Tag Information 0 or 5VDC 120 VAC AC Device 0 or 120VAC

Hardware Tests Power Supply TRIAC RFID Reader

Power Supply Test Power Supply CircuitPower Supply Circuit Output Voltage 5VDC

TRIAC Test TRIAC Circuit 0VDC Sent to Gate TRIAC Output 0VAC 0VAC Output Wave

TRIAC Test 5VDC Sent to Gate 120VAC TRIAC Output 120VAC, 60Hz Output Wave

Voltage/Current Tests Voltage/Current Test Results Expected Value Measured Value%Diff Voltage (VDC) % Operating Current (mA) Passive Mode % Operating Current (mA) Active Mode % Output VAC (VAC) %

RFID Reader Test LED on when tag Present ID-12 Reader RFID Tag RFID Tag Code on Hyperterminal

RFID Reader Test Results TestPass/Fail (Max Distance) 2” Distance From ReaderFAIL (1.50”) Reader Inside of WalletPASS (1.25”) 0.25” Thick Plastic EnclosurePASS (1.25”) 1” Thick Plastic EnclosurePASS (1.00”) 0.25” Metal EnclosureFAIL (NONE)

Other Tests Constraint Expected ValueActual Value%Diff Tag Storage Quantity % Dimmer Modes330%

Software Tests Format (Erase) Erase 1 Tag Write (Store) Read (Toggle) Read (Timer 5s) Read (Timer 10s) Read (Dimmer) Good Tag LED Erase Mode Bad Tag LED Mode Switches Reset Write Mode Read Mode

Format/Erase Test

Write/Store Tag Test

Erase 1 Tag Test

Toggle - Sunny Day Test

Toggle - Rainy Day Test

Timer 5s & 10s Test

Dimmer Test

Completed Prototype TRIAC Circuit AC/DC Circuit Serial Data Circuit RFID & Microcontroller Circuit

Dimmer Stages

Future Work Meet read range constraint of 2” Design PCB to meet size constraint Design enclosure to meet safety constraint Improve dimmer functionality

Bill of Materials DeviceCost RFID Reader$29.95 AC/DC Converter$8.50 TRIAC Circuit$2.99 Microcontroller$5.60 Dimmer Circuit$2.66 Serial Input Circuit$2.43 Total Cost:$52.13

Questions Questions??