Institut Farmaseutikal & Nutraseutikal Malaysia - Tesis

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Model of speed control electric wheelchair
(2009-03-01)
Lim, Ching Chin
The main objective of this project was to design and develop a speed control electric wheelchair’s model. The wheelchair’s model will be used to investigate the characteristic of a speed control electric wheelchair. The project consists of building the wheelchair’s model body, designing the electronic print circuit boards (PCBs), and writing the control system coding. The body consists of a wooden strip board that holds the motor gearbox and PCB boards. The embedded electronics consists of two microcontrollers, which are connected by an I2C bus. A pair of optical encoder was used for speed or position feedback and a LCD was used for user’s display and guidance. One ultrasonic sensor added for obstacle or object sensing. The user will control the wheelchair’s model through a RF wireless remote control. The system is designed for expandability, additional I2C device can be added to the I2C bus and additional sensor can be added to the unused pins of the microcontroller. The system works as expected; we are able to control the wheelchair’s model navigation properly. Through the encoder feedback, we are able to get the running speed in RPM or the distance run in cm for both drive wheels. The encoder readings were proved to be accurate by comparison with tachometer’s readings. As a conclusion, all objectives in this project are successfully achieved.