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Tripwire-Counter ================ This arduino sketch uses a photoresistor and a laser to detect objects passing between the laser and the sensor. A counter is incremented when the beam is broken and can be read using the serial port connection. The circuit diagram looks like this:   Images courtesy of [Lady Ada](http://www.ladyada.net/wiki/tutorials/learn/sensors/cds.html). I've also added a 47 ohm resistor between 3.3v and reset to prevent the board from reseting on serial port connectino. See [this thread](http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1213719666/28#28) for discussion.
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