hey there! i want to build a very basic light sensor, as sort of a substitute for real distance sensing with ultrasonic i want to put my hand above it and have higher (or lower) values if my hands covering it than if its more far away from it, so why not use a simple light sensor first... i'll try…

phototransistor sensor

Grumpy_Mike April 22, 2011, 8:57pm 5

They come in different range values and are very simple to use.

But they don't work very well.

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