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RFID-Based Access Human Transporter

Abstract

The undergraduate research paper documents the implementation and testing of a Segway-like scooter utilizing an MIT DIY Segway design, while adding passive RFID access. Additional features include an adjustable handle bar, lean steering using car struts, an IPOD holder and speakers. Our proposed approach is to base the overall design on the MIT DIY Segway. If a person steps onto the platform the scooter will have the capability to stay up-right. When the rider leans either forward or backward the scooter will accelerate in the correct direction to center itself. Steering will be controlled by leaning the handle bar to allow the rider to turn in the desired direction. The RFID reader will turn on the Transporter only when an authorized tag is placed near the antenna. This security feature will allow only an authorized user to ride the Transporter.

Introduction

The Transporter project will be utilizing the automatic identification method that makes Radio frequency identification (RFID) so unique. The components that enable RFID to be so useful are the exchange of data between a passive tag and reader. The passive tag requires no internal battery power but becomes active by being energized when a when a reader is near. A passive tag is powered is through radio waves that a reader outputs. For our purpose the read range is small so we do not require an active tag that can be read from farther away. Having the read range limited to a few centimeters protects the rider from accidentally turning the Transporter when the rider is not ready.

Using RFID for the power on switch for the Transporter our application allows for security and protection from harm. Since we are using passive tags our read range for our antenna is 3-5cm. This short distance allows the rider to turn the Transporter off and on only when the tag is close enough to be read. There is no danger of the tag being read from across the room and turning the Transporter off or on. On the security side, the Transporter will only be turned on when an authorized tag is place in the antenna field. A data base of authorized tags is stored on the RFID reader itself. Most vehicles like the Transporter will have a button or a key that toggles power on or off. A key or switch can be duplicated and overcome by an un-authorized person. That is why having keyless power-on is so unique. To overcome our security you would have to reprogram the reader and that takes time and requires several pieces of hardware. The Transporter database currently only allows two tags to have the authorization to turn it off or on.

The Transporter’s general requirement is to balance a single person on a two-wheeled platform. The rider will be able to balance themselves on the platform while holding a handle bar located directly in front of them for support. The motors will take in a PWM signal that is outputted by a PIC16F877 processor. The PIC runs a 4MHz clock that will poll the sensors at 100Hz. There are two sensors that allow a person to stay upright. Those sensors include two accelerometers and a single gyroscope. One of the accelerometers monitors acceleration. Measuring the acceleration helps us to know when the Transporter is tilted in a certain direction and adjust the motors to

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Sridharan, S., & Zoghi, B. (2009, June), Control System Project: Rfid Based Access Human Transporter Paper presented at 2009 Annual Conference & Exposition, Austin, Texas. 10.18260/1-2--4864