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momentary to constant multiple con


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danton 
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Joined: August 08, 2014
Posted: August 14, 2014 at 10:18 AM / IP Logged  
Good afternoon.
Today I bought a Motorcycle alarm system with a remote engine ignition function. I find this function obsolete and want to use it as a remote key.
By pressing the button on the remote twice, the main unit sends a 12v signal for about 10ms.
I want to convert that momentary signal to a constant output of 12v to activate 3 NC relays (or 1 with 6 connections). These 3 NC relays will be connected to the 6 wires on my ignition.
I also would like to use that same signal to kill the remote key.
So in short
1. 12v (momentary) -> 12v (activate constant) -> activate 3 relays (NC)
2. 12v (momentary) -> 12v (deactivate constant) -> deactivate 3 relays (NC)
Thanks!
Danton
danton 
Member - Posts: 8
Member spacespace
Joined: August 08, 2014
Posted: August 14, 2014 at 12:13 PM / IP Logged  
I ordered five SPDT Relays and a few diodes to test the setups in the diagrams.
But if anyone has a suggestion please tell!
danton 
Member - Posts: 8
Member spacespace
Joined: August 08, 2014
Posted: August 16, 2014 at 10:05 AM / IP Logged  
Will the following work?
It's based upon the available schematics.
momentary to constant multiple con - Last Post -- posted image.
the12volt 
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Administrator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 07, 2002
Location: Louisiana, United States
Posted: August 17, 2014 at 8:01 AM / IP Logged  
The coils of the three relays you've added to the 12V+ output from the pulsed on/off setup need to be wired in parallel, not series, to work.
momentary to constant multiple con - Last Post -- posted image. the12volt • Support the12volt.com
danton 
Member - Posts: 8
Member spacespace
Joined: August 08, 2014
Posted: August 18, 2014 at 1:07 AM / IP Logged  
Oké thanks!
In a Dutch forum they are complaining that this has too many relays and will not work.
But they don't have any nice diagrams that are tested
oldspark 
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Joined: November 03, 2008
Location: Australia
Posted: August 21, 2014 at 6:34 AM / IP Logged  
Have a look at my "latching relay" circuit (a single relay) and have that drive the other relays you need.
It may be that 10mS is not enough to actuate the latching relay. In this case there are numerous solutions (RC-transistor or MOSFETs etc) but maybe using a 555 timer as a mono-shot that turns on a transistor or MOSFET or relay to drive the other relays is easy.
But there are so many "short pulsed" trigger circuits available (google).
I've always thought it ridiculous to use more than one or 2 relays for logic or state functions, but I'm not adverse to circuitry and I see the advantages for more [electrical types.
(FYI - I have often been extremely impressed buy the relay circuit presented hereon, and let's not forget the early computers that used relays - nor telephone exchanges. But size, power, wiring complexity etc is not for me.)
PS - see eg interlock / switchbreak
danton 
Member - Posts: 8
Member spacespace
Joined: August 08, 2014
Posted: October 12, 2014 at 11:37 AM / IP Logged  
I have the relays and the switch.
Today I managed to get everything to work except for one thing.
The pulse is too long so it immediately switches the circuit back on.
Is there a way to use the following diagram with an extra relay to switch the circuit off?
momentary to constant multiple con - Last Post -- posted image.
danton 
Member - Posts: 8
Member spacespace
Joined: August 08, 2014
Posted: October 13, 2014 at 7:03 AM / IP Logged  
Tested the diagram above and it's working perfect.
Need to add a switch or relay to brake the connection, but that won't be a problem.

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