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(OP)
I need a 5 second logic delay but I need it to work like this....
If my logic signal goes from High to Low, I need to delay the Low for 5 seconds then be able to reset when the alarm that caused my signal to go Low clears...
Basically I have several alarm inputs, when one of these inputs goes low this will energise a relay through a relay driver, but these alarm inputs can be only momentary bounces so I need to delay the relay at least 5 seconds to make sure the alarm is real. This is all done with logic gates and a UDN2596A driver....
Any ideas??
If my logic signal goes from High to Low, I need to delay the Low for 5 seconds then be able to reset when the alarm that caused my signal to go Low clears...
Basically I have several alarm inputs, when one of these inputs goes low this will energise a relay through a relay driver, but these alarm inputs can be only momentary bounces so I need to delay the relay at least 5 seconds to make sure the alarm is real. This is all done with logic gates and a UDN2596A driver....
Any ideas??





RE: Help
Just a few more quesitons. Are there any unique enviornmental requirements for this circuit (Temperature, Vibration, Humidity, etc.). Are there any space requirements? Cost requirements? Life expenctance requirements? etc...
Hope this helps!
RE: Help
Thanks for your idea, but I have a question.
Let me see if I understand this....
when my logic signal goes Low into my relay driver, this enables the relay, but I want a 5 second delay before the relay driver so when my logic goes low, the relay driver basically does not see it for 5 seconds but I also need it to stay low until my alarm condition clears and the logic line goes high again and you think I can do this with a 555 timer.
So basically I can set a timer to trigger on high/low wait 5 seconds then the output of the 555 goes low and stays low until I reset the timer?
Is this correct?
RE: Help
Hope this helps.
RE: Help
I look foward to seeing it.
RE: Help
RE: Help
Mark_Melone@yahoo.com
RE: Help
If not, please send to Travler64@yahoo.com
Thank you.
Jeff