Using PhotoDiode as a lux meter

Thread Starter


Joined Jun 17, 2008
Hi All,

I have this project that I want to measure 5 specific points in a light reflecting mirror.

I am not able to use a lux meter since a lux meter would measure the whole area. its a small area around 5 x 5 cm. I want to measure the 4 corners and the center to see if the light is equally distributed. So the only way is to make a custom circuit using a photo diode to read the luminosity of the area.

Attached is the ckt. Please tell me what you think. Or if somebody can give me an idea, would be much appreciated.
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