## Introduction to Robotics

## WELCOME EVERYBODY

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## What is “Robot” ?

## Let’s Google it

admin : OK Bot, show us what can you do …

bot : I can …

- Learn Skills ranging from electronics, mechanics, controls, programming, etc …
- Work in Industry assembly lines, like a robotic arm used for car-painting, parts assembling, etc…
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- Function as a mobile robot such as terrestial, aerial, aquatic or hybrid vehicle be it manually controlled or autonomous.
- Work in swarms to co-ordinate a task
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## So, what will you learn today ?

How about some robotics ?
Well, we guess you already knew that :)

- First we’ll talk about Manual Robotics, the ones controlled by human (yup, that’s you)

- Then, we’ll move on to autonomous bots, the ones which can perform simple tasks on their own. ( Remember Wall-E ? )

- If time permits, we’ll talk about robots with “eyes” (err.. cameras).

## Mechanical Constructionl

- Chassis, i.e. the basic body structure (generally rectangular)

  - Preferred Material : Flex Board (25 cm x 25 cm)

  - Others : Motor Clamps

## Wheels

- Normal Wheels , the ones you see in cars … toy cars.

- Castor Wheels , a non-drivable wheel that is mounted at the bottom of a vehicle (or robot, in our case), that can move in any direction. You can find them under the ( legs of ) movable tables.

## DC Motors

- Runs on DC input.
- Types
  - Geared Motor :
    - Pros:
      1. Used for bringing about a change in speed, by the use of gears.
      2. Also used to change axis and direction of motion
    - Cons:
      1. No feedback mechanism.

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## DC Motors (contd.)

- Types (contd.)
  - Servo Motors
    - Pros:
      - Used for high torque operations
    - Cons:
      - Costly

## Motion Direction Control

- H-Bridge Circuit
  - Simple electrical circuit using which you can change the polarity at the load.
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- Example:
  - DPDT Switch:
    Switching device that uses H-Bridge principle to change the polarity of load and hence the motion of the motor whenever needed.
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## Drives

- Types of drive we’ll be using:
  - 2 wheel drive, 2 gearbox with castor wheel
  - 4 wheel drive, 4 gearbox
- Others
  - N Wheel Drive
  - Tank Wheel Drive

## 2 wheel drive with castor wheel

It has

- 2 active wheels with gearboxes
- 1 castor wheel for balance and free movement
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## 4 wheel drive with 4 gearboxes

It has 4 wheels connected with 4 gearboxes for fast and agile movement

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## Locomotion using Differential Drive system

bot: I wanna move…
admin: How?
bot: Well now that you have asked so nicely…

- Differential Drive is one way to accomplish this
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- The simplest motions (shown above) occur when all of the wheels are moving
- Different motions are also possible if we keep one/many wheels static

SHOW TIME

We’re pretty sure that you are bored to hell.
So, here’s a little treat for you.

Sit back and enjoy :D

Question time

Now, Throw something at us

Just dont throw an error :P