Browsing by Author "Samarathunga, S.M.B.P.B."

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Two-Wheeled Self Balancing Robot
    (Uva Wellassa University of Sri Lanka, 2016) Samarathunga, S.M.B.P.B.; Wanniarachchi, W.K.I.L.
    This paper presents a method to design and control a two-wheeled self-balancing robot by focusing on hardware description, Complimentary filter algorithm, system modelling and Proportional-Integral-Derivative (PID) back stepping controller design. In the system, signals from the digital Gyro sensor are filtered by a Complimentary filter before being fed to the Proportional-Integral-Derivative back stepping controller. The objectives of the proposed controller is to stabilize the robot while trying to keep the motion of robot to any direction. By experimenting, the values of Proportional-Integral-Derivative parameters such as, Proportional Gain Constant, Derivative Gain Constant and Integral Gain Constant have been obtained and applied for the Arduino board. The special software was complied to convert the digital data from the accelerometer to an acceleration magnitude vector. The magnitude is then compared to a predetermined mathematical function to infer the angle of tilt of the platform. The angle of tilt is then converted to angle of rotation for the gear motors to act on. Complimentary filter is used to filter the gyro data in order to reduce noise, drift, and horizontal acceleration dependency, for the fast estimation of angle. It was noticed that this approach promises much less lag than the low-pass filter alone, and not very processor-intensive. Tuning for Proportional-Integral-Derivative controller is depending upon the physical properties of the robot and the battery power, due to those reasons tuning the controller becomes a difficult task. Experimental results shows that the platform performed as expected. The two-wheeled robot was able to move towards any direction while keeping its balance. Keywords: Complimentary filter, Gyro sensor, Arduino board, Accelerometer, Proportional gain constant
  • No Thumbnail Available
    Item
    Wireless gesture control vehicle
    (Uva Wellassa University of Sri Lanka, 2015) Samarathunga, S.M.B.P.B.; Wanniarachchi, W.K.I.L.
    Gesture is a movement of part of the body, especially a hand or head. Gesture has many properties which shows significant different from speech. There for gestures are being used for the creation of expressive forms. Interaction between human and computer is based on human gestures. Gesture is behaved as an input for the computer and it might make computer more accessible for the physical impaired and make interaction like more natural. In this project hand gestures are used to control a vehicle wirelessly. For that there are two modules are involved. One is the band and the other one is the vehicle. Band is consisting with gyro meter that gives the coordination according to the hand motion and RF module transmits the data that given by the gyro to the vehicle. The vehicle comprehends the signal sent by the gyro meter and it starts to move itself with respect to the signals that given by the hand gesture using gear motors.