How Robots Work

Overview

Unit: Robots in Action (Lesson 4 of 14)
Duration: 60 minutes
Class Size: 19 students
Subject: Technology
Age Group: KS2 (Typically ages 9-11)
National Curriculum Link: Computing – Key Stage 2

• Understand computer networks, including the internet (Year 4)
• Use sequence, selection, and repetition in programs; work with variables and various forms of input and output (Years 5 and 6)
• Understand how computer networks can provide multiple services, such as the world wide web
• Design, write, and debug programs that accomplish specific goals

---

Learning Objectives

By the end of this lesson, students will be able to:

1. Explain the basic principles of how robots work, including sensors, actuators, and control systems.
2. Understand the role of programming and automation in robot operation.
3. Create a simple sequence of instructions (algorithm) to control a robot or virtual robot simulation.
4. Demonstrate hands-on programming of a robot or robot simulation to perform basic movements.

National Curriculum References:

• Computing programmes of study KS2: “Use logical reasoning to explain how simple algorithms work and to detect and correct errors in algorithms and programs.”
• Design and Technology: “Understand and use electrical systems in their products [for example, series circuits incorporating switches, bulbs, buzzers and motors].”

---

Resources Needed

• 2 programmable robots (e.g., Bee-Bots, Blue-Bots or simple LEGO Mindstorms/WeDo kits) for paired practical activity.
• Tablets or laptops with a simple programming environment such as Scratch or a robot-specific app (e.g., LEGO WeDo software).
• Printed worksheets with diagrams explaining robot components and steps to write a simple robot instruction sequence.
• Whiteboard and markers.
• Projector for demonstration.
• Timer/stopwatch for time-bound activities.

---

Lesson Structure

1. Starter (10 minutes)

Activity: Robot Brainstorm & Prior Knowledge Check

• Begin with an open question: "What do you think makes a robot ‘work’?"
• Students discuss in pairs then share with the whole class.
• Teacher records ideas visually around terms like sensors, commands, movements, automation.
• Briefly introduce key components: sensors (inputs), processor (brain), and actuators (outputs).
• Link to previous lessons on robots, reinforcing vocabulary and understanding.

2. Teaching Input (10 minutes)

Activity: Teacher Explanation & Demonstration

• Use projector to display diagram of a robot’s internal components: sensor, processor, actuator.
• Explain programming as giving commands that the robot follows precisely.
• Demonstrate a simple program on a robot or virtual simulation (e.g., move forward 2 steps, turn right).
• Highlight automation’s role in robots: they follow instructions without needing constant human control.

3. Main Activity (25 minutes)

Activity: Hands-On Programming Task (Paired Work)

• Students split into pairs; each pair receives one robot and a tablet/laptop.
• Distribute worksheet outlining a challenge: “Program your robot to move from the start to the finish line avoiding obstacles.”
• Encourage them to:
  • Write down their algorithm (step-by-step instructions) before programming.
  • Code the program using block-based coding or direct robot controls.
  • Test and debug their program to ensure the robot completes the course.
• Teacher circulates, offering support, asking probing questions to guide logical thinking, debugging, and understanding robot inputs/outputs.

4. Plenary (10 minutes)

Activity: Reflect and Share

• Invite volunteers to demonstrate their robot’s programmed movement.
• Discuss as a class:
  • What challenges did you face when programming your robot?
  • How did you fix errors in your instructions?
  • How does automation help robots perform tasks efficiently?
• Summarise key points and highlight progress toward understanding programming and automation.

5. Assessment (During and Post-Lesson)

• Formative: Observations of students working on programming tasks, comprehension through questioning, and reviewing their written algorithms for logical sequence and clarity.
• Summative: Completed worksheet algorithms plus successful programming of robot movements demonstrate achievement of learning goals.
• Optional: quick exit quiz with 3 questions on robot basics and programming principles.

---

Differentiation

• Support: Provide pre-written command cards or a simplified programming interface for students who require scaffolding.
• Challenge: Encourage more able learners to include conditions (e.g., “If obstacle ahead, turn left”) or loops to repeat actions.

---

Cross-Curricular Links

• Maths: Coordinates, direction, measuring steps/distance.
• English: Writing clear, sequential instructions (algorithm design).
• Science: Understanding sensors and automation in everyday life.

---

Extension Ideas

• Research famous robots and their programming complexities.
• Create a storyboard for a robot performing a real-world task.
• Explore ethical considerations around robot automation in society.

---

This lesson supports deep conceptual understanding of how robots operate through an engaging, hands-on approach firmly rooted in the National Curriculum Computing and Design & Technology requirements for KS2 pupils. It inspires logical thinking, problem-solving, and teamwork—essential skills for future digital citizens.