INTRODUCTION TO ROBOTICS Part 1: Overview Robotics and Automation Copyright © Texas Education...

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INTRODUCTION TO ROBOTICSPart 1: Overview

Robotics and AutomationCopyright © Texas Education Agency, 2012. All rights reserved.

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Early Robot History

• The word robot was introduced in 1920 in a play by Czech writer Karel Capek called R.U.R. , or Rossum's Universal Robots.

• Robot comes from the Czech word robota, meaning serf labor or drudgery.

• The term robotics was coined in the 1940s by science fiction writer Isaac Asimov. In a series of stories and novels, he imagined a world in which mechanical beings were mankind's devoted helpers.Copyright © Texas Education Agency, 2012. All rights reserved.

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Asimov's Laws of Robotics:

1. A robot may not injure a human being, or, through inaction, allow a human being to come to harm.

2. A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.

3. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.

Copyright © Texas Education Agency, 2012. All rights reserved.

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Name Robots You Know

What robots do you know about or have heard of ?

• Give a name and a brief description.


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The First Robot

• The first robot was called the Unimate

• Installed in a General Motors automobile manufacturing plant in 1961

• Used to move and weld die castings

• Basically a moving arm on a fixed base

• The first robots were expensive (more than $100,000) and not that useful

• These robots look nothing like the popular android concept used by fiction writers


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Three Common Robot Applications

• Industrial robots are used for jobs that are:

• Dirty

• Dangerous

• Repetitive


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Key factors in actual robot use

• Knowledge of manufacturing system dynamics, including:• materials handling

• manufacturing processes

• manufacturing economics

• human behavior in factories

• Each of these are Industrial Engineering field specialties


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Benefits of Robot Use

• Increased productivity

• Improved (and consistent) quality

• Reduction in cost of manufacturing

• Improved management control of process and productivity

• Operation in hostile environments


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Focus on Jobs

• Robots replace human workers• Primarily routine and labor intensive jobs

• Robots create different types of jobs• Robot technicians, operators, and repairmen

• Salesmen with technical knowledge

• Engineers

• Programmers

• Supervisors with technical process and workflow design expertise

• New jobs require more knowledge and skillCopyright © Texas Education Agency, 2012. All rights reserved.

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What is a Robot?

• A machine capable of carrying out a complex series of actions automatically, esp. one programmable by a computer.

• A robot is a mechanical contraption which can perform tasks on its own, or with guidance.

• In practice a robot is usually an electromechanical machine which is told what to do by computer and electronic programming.Copyright © Texas Education Agency, 2012. All rights reserved.

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Example Robots

• View example robots from the following internet websites:• Industry

• Student Competitions


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General Description

There is no consensus on which machines qualify as robots but there is general agreement among experts, and the public, that robots tend to do some or all of the following:

• move around

• operate a mechanical limb

• sense and manipulate their environment

• exhibit intelligent behavior• especially behavior which mimics humans or other

animals.


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Our Definition

For us, a robot will have 3 features:

• a mechanical device that can move around and manipulate its environment

• uses a microcontroller

• requires a computer program to operate

Some robots we build may not be technically considered true robots, primarily because they will be manually controlled by the user.


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Robot Systems

• Structural System• Physical system that provides support and stability

• Propulsion System (motion)• Drive system includes motors, wheels, and gears

• Sensor, Tool, and Feedback System• Perception, transducers

• Tools, arms, grippers, manipulators, actuators

• Control System• Microcontroller, electrical power, and joystick

• Programming• Operation and controlCopyright © Texas Education Agency, 2012. All rights reserved.

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Simple Robot Block Diagram

ExternalEnvironment

Sensors

InternalEnvironment

Sensors

Control Unit

Actuator External Action


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Robot Basics

• A robot is a device that can respond to and manipulate its environment.

• Sensors are used to gain information about the robot environment.• A robot can only respond to what it senses.

• Actuators are those devices which perform the physical operations of the robot.• Manipulators/arms/grippers

• Motors/propulsion/motion


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Types Of Control

• Remote Control• Wireless using some type of joystick• Uses radio frequencies to communicate

• Autonomous• Performs without human guidance• A computer program tells it what to do• Has sensors to respond to its environment

• Tethered• Wires physically connect controller to robot• Wires may also deliver powerCopyright © Texas Education Agency, 2012. All rights reserved.

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Power

• Our primary power source will be a battery• Portable (robot moves freely)

• Heavy (may need extra support and protection)

• Steady DC voltage

• Needs to be recharged or replaced

• May need multiple batteries with different voltages• One for propulsion (motors), one for the

controller (joystick), one for the microcontrollerCopyright © Texas Education Agency, 2012. All rights reserved.

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Control System

• Microcontroller (mc)• Runs the computer program

• Needs proper connections to make things work

• Needs proper signals to make things work

• Joystick• Sends user control signals to the mc

• Receives control signals from the mc

• Motor controller• Gets signals from the mc

• Sends power to the motorsCopyright © Texas Education Agency, 2012. All rights reserved.

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Robot Evolution

• A robot cannot understand what it is sensing in the traditional way that humans do.

• It can only understand in the way that a program can get information and make useful decisions as a result.

• What we think of as robot intelligence is simply the ability to handle an increased number of variables.• varieties of situations

• Newer robots are able to perform tasks that are non repetitive and non sequential, and in more and more complex environments.


INTRODUCTION TO ROBOTICS Part 1: Overview Robotics and Automation Copyright © Texas Education...

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