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      Lesson details

      Learning outcome

      I can identify and use different input components in control systems.

      Key learning points

      1. A switch controls the flow of current in a circuit or system by making or breaking a circuit.
      2. Input components may sense a specific condition such as light, moisture or temperature
      3. Actuators are used to create a mechanical action in various different systems.
      4. Sensors are input components that convert physical properties of the environment into digital signals for processing.
      5. Sensors can be on-board or off-board components.

      Keywords

      • Switch - controls the flow of current by making or breaking a circuit

      • Sensors - a component that can emit a signal depending on the environmental conditions

      • Flowchart - a diagram that shows the steps of a process from beginning to end

      • Actuator - a component that converts energy or a control signal into physical movement or action

      • Pseudocode - a way of writing out computer program instructions using plain English

      Common misconception

      Systems only use one input.

      Systems often have multiple inputs. These can be switches and sensors.

      Teacher tip

      Download the sample programs and test before the lesson.

      Equipment

      Access to tinkercad.

      Licence

      This content is © Oak National Academy Limited (2026), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      Button A and button B on a micro:bit are examples of ...

      Correct answer: onboard inputs.
      onboard outputs.
      offboard inputs.
      offboard outputs

      Q2.
      When designing a control system it is important to analyse the .

      Correct Answer: Design brief

      Q3.
      Which aspect of the systems approach would measuring the temperature in a greenhouse be?

      Correct Answer: input

      Q4.
      When planning a control system we can use ...

      a pie chart.
      Correct answer: a flow chart.
      a map.
      a pattern.
      a template.

      Q5.
      What is feedback in a control system?

      Correct answer: a signal that is sent back in a loop, depending upon a condition
      a signal that is sent back to the start
      a review of performance
      a signal that moves around the system

      Q6.
      Which of these are output components?

      Correct answer: LED
      microphone
      Correct answer: speaker
      light sensor

      4 Questions

      Q1.
      Inputs can be categorised as switches or .

      Correct Answer: sensors

      Q2.
      Switches can or break a circuit.

      Correct Answer: make

      Q3.
      Match the onboard micro:bit sensor to the definition.

      Correct Answer:microphone,measures sound levels

      measures sound levels

      Correct Answer:temperature sensor,measures how hot or cold it is

      measures how hot or cold it is

      Correct Answer:accelerometer,measures forces

      measures forces

      Correct Answer:compass,measures magnetic fields

      measures magnetic fields

      Correct Answer:light sensor,measures light levels

      measures light levels

      Q4.
      Which code blocks can give you two output options after measuring an input?

      Correct answer: if and else
      if or else
      if not else

      To help you plan your 10 design and technology lesson on: Input components, download all teaching resources for free and adapt to suit your pupils' needs...