9.2 Electronics: Building a Night Light

Build an automatic nightlight

Make a small house that lights up when its sensor is shaded. Build a little, test a little, then explain what you noticed.

Your build journey

1. Catch the darkness: try the model, collect your parts and set up safely.

2. Make a reliable connection: lay copper tape, check and solder the resistor.

3. Discover your light sensor: measure the LDR in bright light, room light and shade.

4. Predict and test: compare the changing sensor voltage with your predictions.

5. Switch automatically: fit the LED and transistor, then test their response.

6. Test, build and finish: find faults, get the circuit checked, fold and finish your house.

What success looks like

• The LED responds reliably when the sensor is covered and uncovered.

• Your connections stay secure before and after folding.

• The sensor is exposed and the battery switch is accessible.

• You can explain one test and one improvement.

Keep the template flat until your teacher approves folding. Read the build steps on each page; use optional help when you need it.

This circuit controls the light through its components. Later you will compare this with a system controlled by code.

Curriculum connections

Select suitable components and a safe supply; represent the circuit; diagnose electrical faults; record test evidence and improve a fit-for-purpose outcome.