I accidentially got two SF313. They are phototransistors, here is a datasheet: http://pdf1.alldatasheet.com/datasheet-pdf/view/45649/SIEMENS/SFH313-2.html As far as I understand it if I apply +5V to it's collector-emmiter, the current running throw it will be proportional to the ammount of light (…

NPN Phototransistor SF313 and ADC

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