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Museum alarm programming and fault finding

Lesson details

Learning outcome

I can program a micro:bit alarm system and test faults in a circuit.

Key learning points

  1. Micro:bit alarm systems can be programmed in many ways using Tinkercad.
  2. When testing circuits, one component should be tested at a time.
  3. There can be many reasons why a circuit does not work.
  4. Electrical components must have the correct current flow.

Keywords

  • Millisecond - one thousandth of a second

  • Accelerometer - a device that measures how quickly something is speeding up or slowing down

  • Fault finding - testing electrical equipment to check whether it's working safely and correctly

  • Logical - thinking in steps, using what you already know, and coming up with sensible solutions

Common misconception

Connected circuits will always work.

Circuits need to be checked that the connections are accurate and the components all work.

Teacher tip

Set up a circuit on each table that doesn't work for different reasons for pupils to explore and decide the reasons for them not working, have wires cut and stripped ready to be used instead of crocodile clips.

Equipment

Wire, wire strippers, micro:bit components, electrical tape, switches

Content guidance

Risk assessment required - equipment

Supervision

Adult supervision required

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.
Which of these is used to measure how bright it is?

Correct answer: light dependent resistor
speaker
buzzer

Q2.
What does a magnetometer in a micro:bit do?

measures sound
Correct answer: detects magnets and direction
lights up the screen
plays music

Q3.
What does LED stand for?

Light Energy Device
Correct answer: Light Emitting Diode
Long Electric Display
Laser Emission Detector

Q4.
Which of these is an input on a micro:bit?

LED light
buzzer
Correct answer: push button
speaker

Q5.
Match the word to the definition.

Correct Answer:input,something that goes into a system

something that goes into a system

Correct Answer:output,something that comes out of a system

something that comes out of a system

Correct Answer:push button,pressing this sends a signal to the micro:bit

pressing this sends a signal to the micro:bit

Correct Answer:magnetometer,a sensor that can detect direction or magnetic fields

a sensor that can detect direction or magnetic fields

Q6.
Put these steps for how a museum alarm can work in the correct order.

1 - the LDR senses how bright or dark the room is
2 - the light level is sent to the micro:bit as input
3 - the micro:bit uses code to decide what to do with the light level
4 - the LED lights up as an output to sound the alarm

4 Questions

Q1.
Which code should be replaced by repeat code to make the accelerometer code work?

An image in a quiz
on shake
clear screen
show leds
Correct answer: if button A pressed then

Q2.
What type of file is downloaded onto the micro:bit?

dex
Correct answer: hex
bex
nex

Q3.
What could be the fault in this circuit?

An image in a quiz
the bulb is broken
Correct answer: the buzzer wires need swapping
the green wire is only attached on one end
there are no cells

Q4.
What does it mean to fault find logically?

to guess where the problem might be
to blame the battery when something doesn’t work
to randomly replace wires until it works
Correct answer: to use clear steps to find what’s wrong in the circuit
Q1 Autodesk screen shots reprinted courtesy of Autodesk, Inc.

To help you plan your 6 design and technology lesson on: Museum alarm programming and fault finding, download all teaching resources for free and adapt to suit your pupils' needs...