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IR trip switch sensor? Answered

Hi all

I have been looking all over the internet for the answer but got stuck

I want to make a simple circuit to set up, so that when someone walks in between an IR beam or laser, and  a sensor, it triggers another circuit...

Is there a useful instructable or a circuit diagram...
I am really stuck.. please help



thanks for the replies.. hopefully my IR beams will now call in the hounds! actually it will just trigger a small camera...

Also of use might be https://www.instructables.com/pages/search/search.jsp?cx=partner-pub-1783560022203827%3Anpr2q7v5m6t&cof=FORID%3A11&ie=ISO-8859-1&q=laser+tripwire or http://www.acroname.com/robotics/info/articles/sharp/sharp.html. Most of the instructables or tutorials you find will probably use a microcontroller. If the device you are using has an analog output, you can avoid using a microcontroller by setting up a comparator to trigger when a certain threshold value is crossed.