double pulse to single pulse how to do it

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dualsport

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Joined: September 27, 2005

Location: United States

Posted: May 22, 2007 at 11:58 PM / IP Logged

Big Dog wrote:

double pulse to single pulse how to do it - Page 2 -- posted image.

Does this rely on the pulse being a specific short duration to work?

Wouldn't the first pulse still make it through to the output if it were to remain active after the point that both relays closed?

dualsport

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Joined: September 27, 2005

Location: United States

Posted: May 23, 2007 at 12:41 AM / IP Logged

This is a modification of the above that should block the first pulse from getting through, and allow the second pulse to pass, if sent within the allowed window; take a look and see if it'll work out.

double pulse to single pulse how to do it - Page 2 -- posted image.

Big Dog

Gold - Posts: 1,265

This member consistently provides reliable information

Joined: May 02, 2002

Location: Quebec, Canada

Posted: May 23, 2007 at 7:21 AM / IP Logged

Hey dualsport, I like it although it might need a resistor across the cap. Mind if I borrow it? Do you use Eagle for your schematics?

Prepare your future. It wasn't the lack of stones that killed the stone age.

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: May 23, 2007 at 12:56 PM / IP Logged

No prob, borrow away! It was your idea anyway, with a twist. I may end up using it to honk my horn when locking my doors on my Caddy's factory RKE, which is oddly set up with no audible feedback. I'll double pulse it to honk the horn, and when a single pulse is issued, it'll stay silent for the times I want it to be silent and don't need the feedback.

I use Orcad for all the drawings; very easy to draw with it-

Why do you need a resistor across the cap though? The coil of the relay will drain down the cap in short order, so I didn't figure it'd need any extra resistance.

megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: May 28, 2007 at 1:26 AM / IP Logged

So anyone have try this design? Ist really can be done? Double Pulse to Single Pulse?

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: May 28, 2007 at 9:38 AM / IP Logged

This just adds a delay to the relay and causes it to lock out the second pulse.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: May 28, 2007 at 11:39 AM / IP Logged

There's not much to it, only variable is you have to select the right size cap based on the relay it's connected to. If you have a large current hungry relay, the amount of time you have to send the second pulse will be shorter compared to if you used a small low power relay.

I'd add a transistor driver to control the timing regardless of the relay selection, but most people want to keep it as simple as possible.

By the way, the first pulse is the one that gets blocked; the second one passes through.

megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: May 29, 2007 at 2:54 AM / IP Logged

My plan..double to single pulse..its for channel...since my alarm dont have any channel...

I found this module...450R

BIG DOG/Anyone :- Do you think 450R can be activate using output from unlock wire?

Once press Unlock Button - Activate Channel 1(Unlock the car )

Twice press Unlock Button-Activate Channel 2

3 times press Unlock Button-Activate Channel 3

4 times press Unlock button-Activate Channel 4

and so on....

Anyone think its possible to be done? Coz my alarm dont have any auxilary output? Really need advise...Coz plan to put autostart,window module,horn..

Thanks

Big Dog

Gold - Posts: 1,265

Joined: May 02, 2002

Location: Quebec, Canada

Posted: May 29, 2007 at 9:17 AM / IP Logged

Hey megatfauzi76, you're on to something good. However, you need the 450T not the 450R.

The 450T is controlled by a single wire whereas the 450R has an antenna and requires a DEI remote with multi-channels.

For the 450T to work, test your unlock output of your security system first to see if in fact it sends a pulse everytime you press the unlock consecutively because not all systems do.

I usually test this by temporarily connecting a relay to the output. If I can get it to activate consecutively within two seconds of each button press then the output is OK for the 450T.

Prepare your future. It wasn't the lack of stones that killed the stone age.

megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: June 05, 2007 at 4:27 AM / IP Logged

Anyone already try the BIG DOG design...double to single pulse? Is it succed? Can I know more specific about the capasitor specification? Thanks

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