I'm currently using a photointerrupt which gives a high voltage when open, and low voltage when it is blocked. I'm using this schematic, with a OPB315 of TT Electronics:
My question is, is there anyway to have the photointerrupt give low voltage when open, and high voltage when blocked?
@yjoeyj
Yes, just swap the positions of the optoisolator and the 10K resistor
Why ?
You can also swap it in software; it doesn't cost you anything 
Connect emitter to GND, R1 between the collector and Vcc, and measure collector voltage.
All it needs in your code is an exclamation mark.
sensorValue = digitalRead(sensorPin); // maybe what you have now
sensorValue = !digitalRead(sensorPin); // logic result is the opposite now
Leo..
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