Basic Robotic Movements - JSS 2 Digital Technologies

BASIC ROBOTIC MOVEMENTS

Subject: Digital Technologies

Class: JSS 2

Term: Third Term

Week: 3

Topic: Basic Robotic Movements

Duration: 80 Minutes (Double Period)

Learning Objectives

By the end of the lesson, students should be able to:

Explain basic robotic movements.
Describe how simple movements are programmed.
Explain the concept of automation.

1. Basic Robotic Movements

A robot moves when its controller sends instructions to its actuators, such as motors. Most robots can perform a few simple movements, which can be combined to complete bigger tasks.

Movement	Meaning	Example
Move forward	The robot moves in the direction it is facing.	A robot moves toward a table.
Move backward	The robot moves in the opposite direction.	A robot backs away from a wall.
Turn left	The robot rotates to its left.	A robot turns left at a corner.
Turn right	The robot rotates to its right.	A robot turns right to avoid an obstacle.
Stop	The robot stops all movement.	A robot stops when it reaches its destination.

Robots with arms can also perform movements such as raising and lowering the arm and opening and closing a gripper.

Note: The speed and the distance of a movement can also be controlled. For example, a robot can be told to move forward 10 steps or to turn 90 degrees.

2. Programming Simple Movements

Programming a robot's movement means writing a set of instructions that tells the robot how, where and when to move.

Instructions Are Followed in Order

A robot follows instructions one after another in the order in which they are written. This is called a sequence. If the order is changed, the robot may do something different.

Example 1: Moving Along a Path

Move forward 10 steps
Turn right 90 degrees
Move forward 10 steps
Stop

The robot moves forward, turns to the right, moves forward again and then stops.

Example 2: Moving in a Square Using a Loop

To move in a square, the robot must repeat the same two instructions four times. A repeat loop saves us from writing the same instructions again and again.

Repeat 4 times
  Move forward 10 steps
  Turn right 90 degrees
Stop

Steps for Programming a Simple Movement

Decide what movement or path the robot should follow.
Break the task into simple instructions, such as move forward and turn.
Arrange the instructions in the correct order.
Use a repeat loop where the same instructions are needed more than once.
Run the program, observe the robot's movement and correct any errors.

Remember: If the robot does not follow the path you expected, check the order of the instructions and the values used for the distance and the turn, correct them and test again, just as you learnt in debugging.

3. Concept of Automation

Automation is the use of machines, programs and technology to perform tasks automatically with little or no human help.

Robots are an important part of automation. Once a robot has been programmed, it can repeat a task many times without being instructed again each time.

Examples of Automation

Automatic doors open when a sensor detects a person approaching.
Washing machines follow a programmed cycle of washing, rinsing and spinning.
Traffic lights change automatically according to a program.
Factory robots assemble, weld or pack products on a production line.
Robot vacuum cleaners clean floors by themselves.

How Robots Automate Tasks

Sensor detects --> Program decides --> Robot acts automatically

Advantages of Automation

It saves time because tasks are completed quickly.
It improves accuracy and consistency.
It reduces repetitive work for people.
It can reduce the risk to people in dangerous tasks.
It can work for long periods without getting tired.

Limitations of Automation

Robots and automatic systems can be expensive to buy and maintain.
They need power and regular maintenance.
They follow their programs and may not handle unexpected situations properly.

4. Practical Activity: Program a Robot Movement in a Simulation

Objective: Students will program simple movements and observe the idea of automation using a simulation. Use a robotics simulation software where available. Scratch can also be used, with a sprite acting as the robot.

Activity A: Move the Robot Along a Path

Open the simulation software or Scratch and select the robot (or sprite).
Program the robot to move forward 10 steps, turn right 90 degrees and move forward 10 steps again.
Run the program and observe the movement.
Change the number of steps or the angle and observe the difference.

Activity B: Move the Robot in a Square

Create a new program using a repeat loop.
Place "move forward 10 steps" and "turn right 90 degrees" inside a loop that repeats 4 times.
Run the program and observe whether the robot moves in a square.
If it does not, check the instructions, correct them and run the program again.

Activity C: Automatic Action

Program the robot to keep moving forward.
Add a condition: if it touches the edge, turn around.
Run the program and observe how the robot acts automatically without further instruction.

Questions for the Activity

Which instructions did you use to make the robot move?
Why was a repeat loop useful in Activity B?
What happens when the order of the instructions is changed?
How does Activity C show the idea of automation?

5. Summary

Basic robotic movements include moving forward, moving backward, turning left, turning right and stopping.
Robots follow instructions in a sequence, so the order of instructions is important.
A repeat loop can be used to repeat movement instructions.
Automation is the use of machines and programs to perform tasks with little or no human help.
Programs can be tested and corrected using simulation software before a physical robot is used.

6. Evaluation Questions

List five basic robotic movements.
What is a sequence of instructions?
Write simple instructions that make a robot move forward, turn right and stop.
Why is a repeat loop useful in programming robot movements?
What is automation?
Give three examples of automation.
State three advantages of automation.
What should you do if a simulated robot does not follow the path you expected?

7. Assignment

Describe five basic robotic movements.
Write a simple program that makes a robot move in a square using a repeat loop.
Explain why the order of instructions is important when programming a robot.
Define automation and give four examples of automation.
State three advantages and two limitations of automation.

8. Interactive Revision Quiz

Select one answer for each question and click Mark Quiz to see your score.

1. Which of the following is a basic robotic movement?

Print Move forward Delete Zoom

2. Which instruction makes a robot change its direction?

Turn right Save Paste Close

3. Why is the order of instructions important in a robot program?

It is not important It only affects the colour The robot ignores the order A different order can make the robot do something different

4. To move a robot in a square, which instructions should be repeated 4 times?

Move forward only Turn only Move forward and turn 90 degrees Stop and start

5. Which programming idea saves us from writing the same instructions many times?

Stop Repeat loop Hide Say

6. What is automation?

Using machines and technology to perform tasks with little human help Doing every task by hand Switching off a machine Drawing a robot

7. Which of the following is an example of automation?

Washing clothes by hand Writing with a pen Walking to school An automatic door that opens when it detects a person

8. Which of the following is an advantage of automation?

It makes work less accurate It makes work slower It speeds up work and reduces repetitive tasks It removes the need for power

9. A simulated robot does not follow the expected path. What should you do?

Ignore the problem Check the instructions, correct them and test again Delete the software Change the monitor

10. Where can robot movement programs be tested without a physical robot?

In simulation software In a printer In a photocopier In a calculator only

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