To liven up your home or office consider making the car horn prank box devised by Randy Sarafan. It consists of a small enclosure holding an Arduino which controls a car horn via external circuitry - and a light-dependent resistor is used to detect the movement of an unsuspecting visitor. Thankfully there is a thirty second delay from being turned on to armed - so you have enough time to hide the device and take cover. The construction and operation has been summarised in the following video:
Although this project would be a lot of fun, please be mindful of the horn location and the ears of passers-by. Nevertheless, you can find complete instructions on the project page. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
Looking for a light sensor? Although it can be tempting to use a light-dependent resistor, they're fragile and can give varying results. Instead - consider our LIGHT: light sensor module based around the digital TEMT6000 sensor. It gives consistent and reliable readings, and is incredibly easy to use with our Getting Started guide. For more information and to order, click here!