TEAM 7: AUTOMATED RETRACTING COASTER (ARC)

SLIDEBME 4901 Final Presentation

By: Hillary Doucette, Stephen Kustra

& Sarmad Ahmad

National Science Foundation

Katrina Tocedjtkmt@cox.net(860) 621-8616

Overview

ARC Slide Platform

ARC Slide Car

ARC Slide Ramp

The Client•Client: Joey Toce

• Six years old.• 42” Tall.• 35 pounds.

•Condition: Cerebral Palsy

•Interests: Outdoor activities

•Car seat fitted for his body.•Needs multiple harnesses to help maintain upright posture.

Joey testing the car and slide.

Introduction: The Project•Purpose: To design and build a coaster slide that Joey can safely enjoy outdoors.

•Constraints:• Joey has limited

motor control.• Back strain for the

parents/operators.• The car must be

able to retract back to the top automatically.

Related ProductsStep 2 “Extreme Coaster”

US Patent # 5,505,663: Self-operable transfer system.

US patent #4,865,312: Recreational device for physically disabled children.

Features

Winch motor with free spooling setting

Lift motor and actuator Tower light indicator Wireless remote

control Photoelectric sensor Track on platform 10ft long ramp Emergency power

switch

Lift and Release Mechanisms

Ramp

Features con’t.

Automated winch hook release.

Battery powered (12V DC)

Car with three separate harnesses.

Winch Hook Release

Car Harnesses

The Electronics• Motors wirelessly controlled

using a 4 channel RF transmitter and receiver.

• 40 pin PIC (16F874A) is used as the controlling unit.

• Microcontroller has 6 inputs : 4 inputs from the wireless

receiver 1 input from the photoelectric

sensor 1 input from the position switch

4 Button Remote Control

Electrical system’s printed circuit board

The Electronics

Motors are powered by a 12V 30A-hr battery.

A 12V-24V DC step-up converter is used to power the 24V LED light using a 12V signal from the DC battery.

Transistor switches are used to amplify or stabilize the output signals.

Battery Box and plug

Red, Yellow, Green LED tower light.

Control box with motor drivers and wireless receiver.

The Photoelectric Sensor

Powered by 12V DC power supply. Sends signal to winch motor to stop

when the infrared light beam is blocked by car wheel.

Prevents car from being pulled back too far.

The Winch Motor

Purchased from TRAC ½ horse power, 12V

DC supply voltage. Free spooling ability. When the

photoelectric sensor is not triggered, winch can be powered in forward or reverse.

When the sensor is triggered, winch remains off.

Winch and spring hook attachment

The Lift Motor

½ horse power. 12V DC input. Controlled by the

wireless remote. Motor will turn on when

the photoelectric sensor is triggered.

It will turn off once the limit switch is triggered.

Lift motor attached to actuator to lift rear platform track.

Lift motor mounted on platform underside.

Lift Mechanism

The Car Modified frame of old gait

trainer. Carrie Seat obtained from

NEAT marketplace. Custom sewn navy vinyl seat

cover. Nylon harnesses included with

the seat. Foot harnesses with Velcro

straps. Side panels made of

polyurethane and covered with Plastic spray paint.

7 inch wheel diameter with plastic hub and outer rubber tread.

Padded arm rests covered with nylon.

The Platform 35inches high. Frame made of

pressure treated lumber and decking made of composite wood.

The front of the platform track is hinged with 2 10” T-hinges.

Side rails to prevent tipping off platform.

The Track

10ft long. Made of pressure treated

wood. Aluminum and wood

flares at the end to help guide wheels while retraction.

Able to detach from platform by removing ¾” pins.

Steel plate at platform interface to attach to platform.

Budget

Budget Initially: $1,385.00 Second Budget: $1,685.00

New motor controllers, PCB, wireless module. Total Expenditures: $1760.00 Remaining : -$74.32

(I will do this in the morning)

Car16%

Platform Mechanics

12%

Lumber15%

Electrical Components

53%

Hinges and Fasteners

3%

Acknowledgements Dr. John Enderle – UCONN BME Director James Paolino – UCONN BME Graduate Student The Toce Family National Science Foundation Serge Doyon, Pete Glaude, Rich Bonazza – Uconn Machine Shop Jennifer Desrosiers, Kerrie Wenzler, Lisa Ephriam Eric Leknes Ray Kustra Mike Doucette

Questions?