IR trip switch sensor?

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


IllegalFun (author) 7 years ago
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 or 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.
NachoMahma7 years ago