Phototransistor-based Tripwire

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alexp

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Hello,

I'm thinking of using an IR laser and a phototransistor as a basic tripwire alarm using the Teensy 2.0 to do something on my computer after the alarm is tripped. Reading the documentation, it seems trivial to have a Windows event trigger after the voltage on an analog pin drops but I was wondering if anyone has any recommendation as to how I should configure the transistor and any tips towards interfacing with Windows events like screen locking and such. Thanks!
 
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