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WIRELESS ELEVATOR REMOTE CONTROL
By
Patrick Goh
Hamed Asghari
ECE 445, SENIOR DESIGN PROJECT
Spring 2007
TA: Dwayne Hagerman
May 1, 2007
Project No. 16 ii
ABSTRACT
The Wireless Elevator Remote Control (WERC) is a device intended to help people in wheelchairs call
an elevator with ease without having to use the buttons on the wall which are often out of their reach.
The WERC will consist of a transmitter unit which will be mounted on a wheelchair and a receiver unit
which will be connected to the elevator call system.
The transmitter module is ergonomically designed to ensure that it can be easily operated even by people
with physical limitations. The simplicity of the controller assures a low learning curve which eliminates
the need for lengthy manuals or technical support. The main purpose of the transmitter is to enable the
user to send a signal to call the elevator to a particular floor.
The receiver module is engineered such that it can be connected to any existing elevator system without
altering the present components and functions of the elevator. Its main purpose will be to receive signals
sent from the transmitter and translate those signals into appropriate output that would control the
elevator. iii
TABLE OF CONTENTS
1.
INTRODUCTION ................................................................................................................... 1
1.1 Purpose............................................................................................................................... 1
1.2 Benefits and Features ......................................................................................................... 1
1.3 Specifications ..................................................................................................................... 1
1.4 Subprojects......................................................................................................................... 2
1.4.1 Transmitter System .................................................................................................... 3
1.4.1.1 Power Supply ..................................................................................................... 3
1.4.1.2 Joystick Controller ............................................................................................. 3
1.4.1.3 Seven-Segment Display ..................................................................................... 3
1.4.1.4 Transmitter ......................................................................................................... 3
1.4.1.5 Microcontroller .................................................................................................. 3
1.4.2 Receiver System......................................................................................................... 3
1.4.2.1 Receiver ............................................................................................................. 3
1.4.2.2 Elevator Process Controller ............................................................................... 3
2.
DESIGN PROCEDURE .......................................................................................................... 5
2.1 Power Supply Design......................................................................................................... 5
2.2 Data Transmitter and Receiver Design .............................................................................. 5
2.3 Joystick Design .................................................................................................................. 5
2.4 PCB Layout and Enclosure Design.................................................................................... 6
3.
DESIGN DETAILS ................................................................................................................. 8
3.1 Overall Circuit Functionality ............................................................................................. 8
3.2 Components ....................................................................................................................... 9
3.2.1 Transmitter ................................................................................................................. 9
3.2.1.1 PIC Microcontroller ......................................................................................... 10
3.2.1.2 Transmitter ....................................................................................................... 11
3.2.1.3 Clock Oscillator ............................................................................................... 11
3.2.1.4 Seven-Segment Display ................................................................................... 11
3.2.1.5 Power Supply ................................................................................................... 11
3.2.2 Receiver ................................................................................................................... 11
3.2.2.1 PIC Microcontroller ......................................................................................... 12
3.2.2.2 Clock Oscillator ............................................................................................... 12
3.1.2.3 Receiver ........................................................................................................... 12
3.1.2.4 Relays............................................................................................................... 13
4.
DESIGN VERIFICATION .................................................................................................... 14
4.1 Testing.............................................................................................................................. 14
4.1.1 Power Supply ........................................................................................................... 14
4.1.2 Oscillator.................................................................................................................. 14
4.1.3 Joystick and 7-Segment Display .............................................................................. 15
4.1.4 Transmitter and Receiver ......................................................................................... 15
4.2 Conclusions...................................................................................................................... 17
5.
COST ..................................................................................................................................... 18 iv
5.1 Parts.................................................................................................................................. 18
5.2 Labor ................................................................................................................................ 18
6.
CONCLUSIONS.................................................................................................................... 19
6.1 Accomplishments............................................................................................................. 19
6.2 Uncertainties .................................................................................................................... 19
6.3 Ethical Considerations ..................................................................................................... 19
6.4 Future Work/Alternatives ................................................................................................ 19
REFERENCES....................................................................................................................... 20
APPENDIX A PICTURES ............................................................................................... A.1
APPENDIX B TRANSMITTER PIC CODE ................................................................... A.2
APPENDIX C RECEIVER PIC CODE............................................................................ A.7 1
1. INTRODUCTION
1.1 Purpose
The goal of our project is to enable elevators to be controlled from a distance without using the elevator
control panels. We hope to use this device as an aid for people in wheelchairs. One of the main
components of the device will be a remote control which should be small enough to be mounted on
wheelchairs. It will contain all the necessary functions to control an elevator. Jeff Miller, an Elevator
Mechanic Foreman at the University of Illinois, suggested using small joystick controllers and limiting
the functions to the bare necessities of people in wheelchairs to avoid overcrowding the controller. Thus,
the controller would be designed to accommodate the three main elevator functions, namely the elevator
call function, a floor selector and a door open function. A separate receiver module will be designed to
receive signals sent from the transmitter and control the elevator as specified by the user.
1.2 Benefits and Features
The basic benefits and features of our device are outlined below:
Benefits:
Making elevators more wheelchair-friendly.
Ability to call the elevator from a distance.
Easy installation on elevators. No alterations to the elevator system.
Features:
User-friendly controllers.
Small and compact controllers.
Includes all the necessary functions to control an elevator.
Clear and bright seven-segment display for floor selection.
1.3 Specifications
The project was divided into two main components: the transmitter and the receiver as shown in the
block diagram below in Figure 1.1. For individual module specification, refer to section 1.4 2
Figure 1.1 Block diagram
The transmitter si