delay activating PIR module (NE555) ?

Thread Starter


Joined Oct 21, 2010
hi guys...
I'm very beginner in electronics..
I'm experimenting with PIR module
I've also build a circuit and it works well, so there's a problem.
when ever a moments occurs the beep goes on (its ok ) but it re- activates in 5 seconds to recognize the next moment.
its very annoying... !
so my question is how to delay the re-activation from 5 seconds to 30 seconds.?
Is 555 timer is helpful here..?


Joined Nov 12, 2008
Welcome to AAC.

You can add a 555 in monostable mode to add a 30 second delay as you mentioned. The output of the PIR is fed to the trigger input of the 555, then your alarm, light, etc. is connected to the output of the 555. For some ideas, take a look at this thread.