Relay to energize after 4 pulses

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cctyler

Member - Posts: 10

Joined: December 11, 2003

Posted: March 15, 2004 at 2:41 PM / IP Logged

Im trying to power a few extra sirens/peizos for my alarm, but I don't want the extra sirens to chirp when the regular siren chirps. I only want the extra sirens to go off when the alarm is triggered and the regular siren is going full tilt.

So I need a relay that can pass off 4 pulses (thats the maximum # of pulses my alarm gives off for any command, starter,warn away, arm) but once is sees a constant pulse, to stay energized.

Ex: when I disarm the alarm, I get 2 pulses from the siren output. When the alarm is triggered, I get a constant pulse from the siren output. The relay needs to ignore the pulses and only be activated when it sees the constant siren output.

Make sense? I was thinking about a timer relay, but I haven't seen many around. As long as the pulses weren't long enough that the relay counts them as seconds. Would using a cap and a resistor work just as well? I think it all depends on the length and interval of pulses correct?

Anyone than can help, much appreciated,

Thanks.

cctyler

Member - Posts: 10

Joined: December 11, 2003

Posted: March 19, 2004 at 3:44 AM / IP Logged

So I need something to delay the signal coming from the siren output. Can a cap and resistor do this?

NowYaKnow

Gold - Posts: 1,217

Joined: December 18, 2002

Posted: March 19, 2004 at 8:56 AM / IP Logged

You could try the diagram below. Basically if the alarm is armed and the door is open (ie: alarm going off) the extra sirens sounds. The first diagram assumes the door trigger in your car is positive. If your already using the ground out when armed for something else make sure to diode isolate it!

Relay to energize after 4 pulses -- posted image.

NowYaKnow

Gold - Posts: 1,217

Joined: December 18, 2002

Posted: March 19, 2004 at 8:59 AM / IP Logged

Here's the diagram if you are using a negative door trigger in the car.

Just an idea I have never actually tried this circuit but it should give you a starting point. It works in theory so give it a try and see what happens. Good luck,

Mike

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: March 19, 2004 at 10:18 AM / IP Logged

This last circuit will sound the sirens only when a door is opened while alarm is armed. I think cctyler wants the sirens to sound on a full trigger, not just only when a door is opened. For example, when the shock sensor triggers the alarm, this won't sound the sirens.

It is a good starting point. Just more triggers need to be connected as required(with isolation for each of course). If you have dual-zone sensors, you can connect the second zone of each sensor to the relay input, connecting to where you see the -ve door trigger input. This way only a "full-tilt" like you put it will sound the extra sirens. I will try to put up an pic supplementing what you see above if I get the time to draw it.

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: March 19, 2004 at 10:59 AM / IP Logged

easiest way I would think of.. program a microcontroller to ignore any input that doesnt last a certain length. You could also set a monostable timer up for longer than each pulse, have the pulse trigger it then when finished check again, if it is still active the alarm must not be chirping, It may be hard to calibrate to be just right though.... just some ideas...

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Relay to energize after 4 pulses

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