As a possible form of altitude sensor or other detection device, Geoffrey Barrows has created an interesting analogue edge detector using an Arduino and a lot of light-dependent resistors. As light changes across the LDRs, the signals from each are measured and using an algorithm programmed into the Arduino a flow-direction can be determined. In the following video the concept and project are explained in more detail:
A fascinating use for light-dependent resistors. For more information visit Geoffrey's project page. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
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