# Circuit stuff

**URL:** <https://forum.kirupa.com/t/circuit-stuff/167425>\
**Category:** random\
**Created:** [October 28, 2005, 2:33am UTC](https://forum.kirupa.com/t/circuit-stuff/167425 "2005-10-28T02:33:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cholin](https://avatars.discourse-cdn.com/v4/letter/c/8edcca/32.png) [@cholin](https://forum.kirupa.com/u/cholin)\
**Post date:** [October 28, 2005, 2:33am UTC](https://forum.kirupa.com/t/circuit-stuff/167425/1 "2005-10-28T02:33:26Z")

</div>

Alright, this is a hardware question about circuits and chips:

Im making motion detectors right, well, so far, you get a + whatever voltage when somebody breaks my beam thingy. Thing is, if someone quickly runs by, it triggers for like 1/10 of a second and thats not long enough to notice!

What can I use to set something off for at least 5 seconds or so…

I was thinking of using 555 timers and using the input voltage as the trigger and using a potentiometer to adjust the length of time, but then I need one 555 for each input I have… wanted to know if theres an easier way…

[![](http://img459.imageshack.us/img459/5861/schematic9vg.jpg)](http://imageshack.us)