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:
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
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Getting Started guide. For more information and to order, click
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