I was wondering if I could use relays to convert a momentary output (such as trunk release) to a switched latch output so that when I activate the momentary output via remote, it turns something on, until I hit the remote again.

I've seen 2 relays used to convert momentary to constant, but it says you have to add some extra relays to turn it off via the same method, could someone help me figure out the rest of the wiring?

Thanks!

Heres the link that already shows how to convert momentary to constant, but WITHOUT turn off.
http://www.the12volt.com/images/momentconstant.gif


[Modified by o_Rage_o, 10:08 AM 2/6/2002]

 

Damn mang, you put my brain to smoke....I'm trying to do it by myself without recurring to a book or a search. I know it can be done. I printed the first diagram and I'm trying to figure it out. If you have any answer before me let me know. I need to see that.

 

http://www.the12volt.com/relays/page5.asp

To turn it off you just remove the ground or +12v off the relay on the right


There you go
good luck


[Modified by 99VTECex, 5:52 PM 2/6/2002]

 

Ok, but how do you disconnect the ground or the positive from the second relay when you pulse your ground output again from the remote. Those diagrams don't work for that purpose. Or in that case, how do you insert that circuit to the first one?

 

Now you see my problem )

Or, if any of you know a latching relay that has this feature (click on, click off) all built into one, by all means tell me.

Thanks!

 

Oh, now you're talking. I know there is a electromechanic latching relay. The thing is where to get it from. You migh try Radio Shack.

 

You could create a mealy state machine to do this. You would need soldering skills to put it together.

 

If i were to use a mealy state machine to solve the problem, which components would I use, assuming I have prior knowledge about the circuit (I made the xor gate circuit and tested it), and how will I convert my circuit or use the appropriate components for the 12 volt electrical supply in the car..?


[Modified by o_Rage_o, 4:50 AM 2/9/2002]

 

You need a D flip flop and yes a xor gate. You would also need a clock, all easily available parts from Radio Shack. If you know how to use this stuff it shouldn't be to hard to figure out how to lower the voltage down to IC levels. You need the parts first to know what voltage level you need to operate at. Usually its 5V. If you have any specific questions you can e-mail me.



[Modified by nsxxtreme, 9:00 AM 2/9/2002]

 

I see you've also finished taking digital design I finished the course last semester.

Would I have any problems with lowerng the current ? And would the use of the clock constantly cycling in the background be a significant drain on the battery *I'm guessing it'll be just like a 300ma Alarm LED or something*
?

 

Depending on what parts you use will determine home much current it will use. If you went with some surface mount parts I'm sure you could get the current down very low. I know there is a way to do this with transistors too. I will have to think about this one.

With the above mentioned process you will have to know how long off a pulse you have so you know what frequency to run the clock at.

What are you using to model with. I use P-Spice its free.



[Modified by nsxxtreme, 9:14 AM 2/9/2002]