Have you ever noticed that street lamps and security lights turn on automatically at night? How do they do that? The answer is surprisingly simple, they have light sensors in them to work out how dark it is. If the sensor doesn’t detect enough light, it will turn the lamp on.

Now you can make your own automatic light with CodeBug and a light dependant resistor (LDR).

	CodeBug
	Micro USB cable
	Computer
	Crocclips
	Light dependant resistor
	10k ohm resistor