Development of Self Balancing Arduino robot Table of content chapter



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Development of Self Balancing Arduino robot

INVERTED PENDULUM THEORY
To develop a reliable and capable control system for a two wheeled balancing robot, an understanding of the parameters within the system is essential. Representation of these can be achieved through a mathematical model. Inverted pendulum theory is more traditionally known as Pole and Cart theory and although the two wheeled balancing robot does not directly compare to the Pole and Cart, the same principles are in effect. Within the system model, the cart equates to the wheels whilst the pole equates to the robot’s chassis.
Friction coefficients have been neglected in this project as the robot will be expected to transverse across numerous types of terrains and surfaces. If the coefficients were to be considered during the control systems design and implementation, then additional sensors, circuitry and power consumption would be required to derive these new values whilst in operation. The time, effort and resources required to create this capability far exceed any benefits that could be expected with there inclusion.
It is necessary to generalize the effects of the left and right wheels and incorporate them together under the combined term “wheels”. This simplifies the calculations as both wheels will work in unison to maintain stability. For determining specific torque (forces) requirements for each individual wheel, the wheels value can be halved for an approximate single wheel value. This approach is considered acceptable as the terrain and surface will vary between the wheels on certain terrains. The aim of the inverted pendulum principle is to keep the wheels beneath the centre of the robot chassis mass. If the robot begins to tilt forward, then to maintain stability, the wheel will need to move forward to return beneath the chassis mass. If this is not maintained, the robot will simply fall over. The following system dynamics are associated with the mathematical problem.

1.2 Problem statements

Robotic mobility technology over the past few years have gained much more popularity in both government and commercial sectors. .In last few decades, the open source community has expanded to make it possible for people to build complex product at home. A quick look at the range of mobile robots in existence system reveals an enormous change diversity in shape, form, and modes of mobility. The most common is the passively balanceness (i.e. state of stable equilibrium). The main goal of our project is to design and implement a discrete control system that will provide robotic stability. There has been varieties of technique to increase the robotic stability on dynamic environments .One such popular technique used for mobile robots is an inverted pendulum based model. A robot that implements the inverted pendulum is usually a tower shaped structure, usually standing on two-wheels and autonomously commanding the motors such that it can keep itself upright while also travelling guided by the user input .Complementary are implemented which is associated with the noise of the signal .Thus the purpose of complementary filter if to simplify the noise by passing it to low pass and high pass filter. We are demonstrating a method which presents the stability by reading the robots tilt from sensors and computing commands for the motors and is analysed using different filter coefficients using PID algorithm as the control strategy. Self balancing robots are designed for variety of user types. The role of the self-balancing is to interpret small muscular activations and high level commands and execute them. Such platforms typically employee techniques from artificial intelligence, such as path-planning. The proposed system Self Balancing Robot is based on Artificial Intelligence domain of Robotics and is an efforts to provide complete automation of the activities involving in houses, restaurants, hospitals and companies. The system would use a Complementary filter and PID control algorithm for sensors and motor controller which provides integrated values and helps in maintaining stability. The inverted pendulum has been the most popular benchmark, among others, for teaching and research in control theory and robotics. The problem regarding 4 wheel or 4 legged robots is that it is more space consuming thus to overcome this problem we built two wheel self-balancing robot which consume less space and can be easily used for transportation(hospitals, companies, restaurants).Besides learning about the theoretical aspects, the project also incorporates the practical side. Complementary filter was also a motivation to develop the self-balancing robot which fuses the data from two sensors such that a better estimation of tilt angle is obtained. Hence, this system would also be designed in such a way that it optimizes the use of energy and satisfies human needs.




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