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Old 11th May 2004, 08:12 PM   (permalink)
Default building a 4 zone timed alarm

I have a design challenge, i need to build an alarm with at least 4 zones, a waiting time before activation and has to run max with a 9 volts battery eficiently (no CMOS aparently), any help will be apriciated.
DeWilde is offline  
Old 11th May 2004, 08:56 PM   (permalink)
Default

No one here will do Your work for You but...................

CMOS is exactly what you need as it has a negligible quiescent current drain. The over all design needs a few things.
1) Sensors, what are you trying to detect and where?
2) a timer , for entry/exit delay.
3) a code pad or key switch for activation/deactivation.
4) logic that makes the whole thing work.
5) maybe optional... A real world output that is controlled by the logic. ( I.E. a relay or optocoupler to activate a siren,lights or dialer)
TillEulenspiegel is offline  
Old 13th May 2004, 10:08 AM   (permalink)
Default

what about this?
http://www.mitedu.freeserve.co.uk/Ci...arm/5zalm.html

now, for the CMOS, well, i think they are the best option in your case if you want low power. i don't really see a GOOD way to get around them.
bogdanfirst is offline  
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