bowen73 wrote:ok, getting a little closer...
the laser triggeris giving out .06v according to the tester, so thats why it appears to be triggering constantly. when it triggers it sends a 12v signal.
so what wouldbe the next step?? i was thinking a 12v relay so it wont allow it to pass the .06v as a non triggered current the maybe a resistor to set it down to 5v from 12v once the relay has triggered??
any idea which relay/resistor i would need?
You'll need to look into setting up a little pull-down-resistor to hold the voltage at 0V when its not triggered. - http://playground.arduino.cc/CommonTopi ... wnResistor
Look into a voltage divider to convert that 12v down to 3v3, do not use 5v, that will damage your Pi as well! - https://learn.sparkfun.com/tutorials/voltage-dividers
If you've already put 12v onto one of the GPIO pins of the Pi, I wouldn't be surprised if you've damaged that pin, and if not others.