Datasheet

In this case, our 'bucket' is a 0.1uF ceramic capacitor. You can change the capacitor nearly any way you want but the

timing values will also change. 0.1uF seems to be an OK place to start for these photocells. If you want to measure

brighter ranges, use a 1uF capacitor. If you want to measure darker ranges, go down to 0.01uF.

/* Photocell simple testing sketch.

Connect one end of photocell to power, the other end to pin 2.

Then connect one end of a 0.1uF capacitor from pin 2 to ground

For more information see http://learn.adafruit.com/photocells */

int photocellPin = 2; // the LDR and cap are connected to pin2

int photocellReading; // the digital reading

int ledPin = 13; // you can just use the 'built in' LED

void setup(void) {

// We'll send debugging information via the Serial monitor

Serial.begin(9600);

pinMode(ledPin, OUTPUT); // have an LED for output

}