RFID AC SWITCH

Final PresentationNovember 25, 2008

Team Members

Ricardo CalderonElectrical EngineeringTeam LeaderDimmer FunctionDebugging Website

Jonathan StanleyElectrical EngineeringResearch and DocumentationSoldering Parts on PCBWebsite Design

Jerome WalkerComputer EngineeringResearch and DocumentationEagle Schematic DesignWebsite Design

Corey TateElectrical EngineeringResearch and DocumentationEagle 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

Name DescriptionSwitching Voltage Must operate at 120 VAC.

Output Current Must have a maximum current of 15 amperes.

Read Distance Must have a read distance of at least 2”.

Authorized Tag Identification

Must read 125kHz tags.

Tag Quantity Must store at least 200 identification tags.

Technical Constraints Results

Switching VoltagePass

Output CurrentPass

Read DistancePass

Authorized Tag IdentificationPass

Tag QuantityPass

Practical Constraints

Type Name DescriptionManufacturability Size Must have dimensions of at most 4”

in length, 4” in width, and 2” in depth.

Health and Safety Safety Must 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 GuidelinesPass

Testing

• Format (Erase) - 0 0 0 0• Erase 1 Tag - 0 0 0 1• Write (Store) - 0 0 1 0• Read (Toggle) - 1 0 0 0• R (Timer 5s) - 1 0 0 1• R (Timer 10s) - 1 0 1 0• R (Dim Up/Down) - 1 1 0 0• R (Dim Up) - 1 1 0 1• R (Dim Down) - 1 1 1 0• R (Dim %) - 1 1 1 1

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

• 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 I Senior 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

Device CostRFID Reader $34.95AC/DC Converter $10.90TRIAC Circuit $2.99Microcontroller Circuit $9.55Dimmer Chip $0.53USB Input Circuit $15.96Total Cost: $74.88

Questions

Questions??