PIR sensor

[Xenobius1]

Hello I was at the local electronics shop and I bought a PIR (like a transistor with 3 leads and a smal screen on it's head.

I would like to build a sensor so that when my neighbours cat jumps inside the house from the window, I would know with the help of an led and a small beep.

Could anyone help me please?

thanks a lot

 

[ante1]

Here is an example.

View attachment 35813

 

[Xenobius1]

Thanks mate. Now I want to make an LED flash 5 times for 1 second or 2 when someone passes from inforont the PIR. How can I do that with a Low output (lowoutput from the schematic in the thread above) also Is it possible to make an optional piezo buzzer just in case I find the system not good in the morning and I need sound? I think this would be usefull to everyone knowing you can make an led, (maybe a relay) , and a piezo buzer with it.

thanks