relay order

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noctorum

Member - Posts: 17

Joined: June 26, 2008

Location: Minnesota, United States

Posted: July 02, 2008 at 10:37 PM / IP Logged

I have three relays that I need to activate in a certain order. Should these be wired in series? Parallel? Some combination thereof? I need to make sure that Relay 1 switches before Relay 2, and Relay 2 before Relay 3.

i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 02, 2008 at 10:44 PM / IP Logged

What are you using to trip the relays? What exactly are you trying to do?

noctorum

Member - Posts: 17

Joined: June 26, 2008

Location: Minnesota, United States

Posted: July 02, 2008 at 11:00 PM / IP Logged

i am an idiot wrote:

What are you using to trip the relays? What exactly are you trying to do?

Building a type of remote starter. Relay 1 activates bypass, Relay 2 starts ignition and Relay 3 cranks starter. I have a momentary pulse of 5v that is put through a reed relay to have 1 12v+ available to drive the 3 relays.

noctorum

Member - Posts: 17

Joined: June 26, 2008

Location: Minnesota, United States

Posted: July 02, 2008 at 11:01 PM / IP Logged

Edit: Relay 1 and 2 will be double coil latching relays, relay 3 is SPST

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 02, 2008 at 11:15 PM / IP Logged

I have never worked with a double coil latching relay before, I have a few questions. How many connections are there on the relay? How many for the coils and how many for the actual switching mechanism? Can you post a link to the relays? I can draw you a diagram that actually looks like the relay.

Will the cycle be Bypass, ignition, start, and then off? Is there a negative pulse for off or will it too be a positive?

Are these latching relays available in DPDT format?

noctorum

Member - Posts: 17

Joined: June 26, 2008

Location: Minnesota, United States

Posted: July 03, 2008 at 12:03 AM / IP Logged

i am an idiot wrote:

Will the cycle be Bypass, ignition, start, and then off? Is there a negative pulse for off or will it too be a positive?

Are these latching relays available in DPDT format?

I'm having trouble sourcing bistable relays for a price I'm willing to pay, so I'm just going to use SPDT set up to latch. I spent a few minutes in paint and have a diagram:

I need R1 to activate first, bypass has to be active for the other two to work.

R2 has to activate second, accessories needs to be hot to crank.

R3 is last, and cranks starter.

The 12v pulsed is going to be hot for 2 seconds (when I start the car). This will activate R1, R2 and crank the engine for 2 seconds.

It's easy for me to extend the duration if that would help?

noctorum

Member - Posts: 17

Joined: June 26, 2008

Location: Minnesota, United States

Posted: July 03, 2008 at 12:05 AM / IP Logged

Link is broken somehow. Direct link:

https://img371.imageshack.us/img371/7987/relaycircuitwp5.png

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 03, 2008 at 5:58 AM / IP Logged

I think we can do this with a lot less relays, if of course this situation will work for you. It is very easy to delay the triggering of a relay. How about this, touch the switch = bypass. Touch and hold 1 second = bypass then ignition. Touch the switch 2 seconds = bypass, Ign and then start. If this will work let me know. If ignition is already on, you will still have to hold for 2 seconds to start. All off will be a but of a task, but I am going to sleep on it.

Hyperlink to your pic

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: July 03, 2008 at 9:54 AM / IP Logged

http://www.avr-asm-tutorial.net/avr_en/index.html

Your best bet here would be to use a programmable microcontroller. It will be more initial work, but a much cleaner system and much more reliable over the life of the car. It will also be stable in extreme temps (RC circuits won't be). This type of microcontroller is what the remote start manufacturers use for their timing and control. Using a programmable logic controller will also give you the ability to incorporate much better features in to the entire system (like push to stop, automatic cranking, etc.)

If you are going for a completely keyless operation system I would strongly recomend not using 20 relays to control the thing - it would be a nightmare to troubleshoot in 12 months when a relay fails or something else happens.

Kevin Pierson

noctorum

Member - Posts: 17

Joined: June 26, 2008

Location: Minnesota, United States

Posted: July 03, 2008 at 10:41 AM / IP Logged

The activation circuit already uses two STAMP2's, I'll see about incorporating another. I hate coding assembly heh. Worst case I'll just use two switches to activate the bypass.

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