Laptop automatic startup using a single shot relay

jonee · 04-21-2005, 01:59 AM

I've been looking for an automated way to startup my laptop upon ignition.
I didn't like the idea of having to push a button manually.

Therefore I thought of this solution which is a combination between wake on link (modem) and a single shot relay (http://controlsupply.com/a4121.htm).

Would it be possible if I would wire the ignition simply to my DC-DC laptop converter, and let the s-s relay 'sense' current on the same wire and pulse the single 'wake on link' signal to the modem?

ensjesse · 04-21-2005, 06:33 AM

I have been looking for a way to do this as well, however i dont think a "wake on" option would be the best idea, seems complex, what about maybe just simply having some kind of circuit that would jump the switch on the laptop directly?

Im not sure how to solve this with out modification.

Jesse

Quote: Originally Posted by jonee

I've been looking for an automated way to startup my laptop upon ignition.
I didn't like the idea of having to push a button manually.

Therefore I thought of this solution which is a combination between wake on link (modem) and a single shot relay (http://controlsupply.com/a4121.htm).

Would it be possible if I would wire the ignition simply to my DC-DC laptop converter, and let the s-s relay 'sense' current on the same wire and pulse the single 'wake on link' signal to the modem?

Scouse Monkey · 04-21-2005, 08:03 AM

its a pulse relay. It will dot he job you want yeah. they you set the PC to standy or hibernate after so many minutes after AC is turned off.

There is quite along thread about ti somewhere...
http://www.mp3car.com/vbulletin/laptops-tablets-upmcs-etc/34896-remote-laptop-startup.html
there is a circuit to build your own pulse relay there witha couple of components and some otehr stuff.

jonee · 04-21-2005, 08:57 AM

Jesse, As for the startup: I can't use the "pulse relay" to pulse the power button because, when the ignition is on and the laptop is working, it is possible that the ignition is switched off for a few secs/minutes and then restarted (eg after filling up at the gas station).
At that time the laptop will probably still be running, so when the car 'ignites' it will send a pulse to the power button, meaning to send the laptop to standby/hibernate.

I don't think that if the laptop is on and it receives a wake on ring/modem, that anything will happen, and that's what is supposed to happen.

Scouse, thanks for the link.

McFreak · 04-21-2005, 11:32 AM

What about telling windows to do nothing when the power button is pressed. That way the pulse will work when the laptop is hibernating, but if windows is running it shouldn't do anything if you stop for a short time. (Depending on what you have the hibernation time set when running on battery)

kuo · 04-21-2005, 11:40 AM

Quote: Originally Posted by McFreak

What about telling windows to do nothing when the power button is pressed. That way the pulse will work when the laptop is hibernating, but if windows is running it shouldn't do anything if you stop for a short time. (Depending on what you have the hibernation time set when running on battery)

wow, that is much better than what i did. i ended up using a 5v relay hooked up to a usb port to only allow 12v into the pulse relay if the computer was not powered on. i was concerned about the 5v relay burning up because of the 12v running through it... i like your way much better. time to make a change.

jonee · 04-22-2005, 01:38 AM

Quote:

What about telling windows to do nothing when the power button is pressed. That way the pulse will work when the laptop is hibernating, but if windows is running it shouldn't do anything if you stop for a short time. (Depending on what you have the hibernation time set when running on battery)

Well, that would work once windows is up and running, but have you tried pushing the power button before windows is loaded? Eg 5 seconds after booting. My laptop shuts down immediately in that case.

But maybe there might be a solution if we could 'tell' the pulse relay that after a pulse, it shouldn't pulse again for let's say 20 secs.
Anyone know of such a pulse relay?