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.shtmlThanks ribs!!!!!!!!!!

old school: