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Year 11 - Computing

Optical sensors for navigation

Using physical computing to create a robot buggy

Unit Summary

This unit introduces pupils to physical computing by building a robotic buggy. They will use a Raspberry Pi Pico microcontroller to explore inputs and outputs, and utilise a range of hardware components, including motors, reflective optical sensors, LEDs, and an ultrasonic sensor.

Lesson Summary

You will learn to describe and use optical reflective sensors to react to an environment.

Key Notes

  • Reflective optical sensors detect surface contrast.
  • Reflective optical sensors emit infrared light and measure how much is reflected back.
  • Light coloured surfaces like white reflect more infrared, while dark surfaces like black lines reflect less.

Vocabulary To Learn

  • environment: the surroundings or conditions something exists in or reacts to
  • optical: something that relates to light and vision
  • reflective: something that bounces back light or other waves like sound

Common Mistakes To Avoid

  • The sensor follows the line like a smart camera.

3 Quick Questions (With Answers)

1. Describe the system or process from this lesson in clear steps.

Reflective optical sensors detect surface contrast. Reflective optical sensors emit infrared light and measure how much is reflected back.

2. Define this computing term and give one practical example. 'environment'

the surroundings or conditions something exists in or reacts to. Add one real device or system example to prove understanding.

3. Correct this common computing misconception.

Mistake: The sensor follows the line like a smart camera. Correction: The sensor sends data back to the microcontroller to say whether light or dark is detected. The written code uses this data to decide how the buggy should respond.

More Lessons In This Unit

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