Electronics > Electronics

photoresistor tutorial update

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**Admin**:

Thanks to the SoR member 'ribs', we got a nice welcome upgrade to the photoresistor tutorial.

Remember how we had to use the excel sheet with a graph to find the resistor to give the optimal voltage output?

Well ribs did some crazy calculus and derived an equation that gives the answer right away . . .

resistor = sqrt(R_dark*R_bright)

If you want to see the crazy math, I posted it on the tutorial:

http://www.societyofrobots.com/schematics_photoresistor.shtml

Thanks ribs!!!!!!!!!!

old school:

**sdk32285**:

Interesting..

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