MP3Car.com - View Single Post - AVR based laptop startup/shutdown controller

Shad0wca7 · 03-27-2008, 06:56 AM

Thanks for the input Rob, some great suggestions which I'm going to use so standby for a redesigned version using transistors. Although won't there be the risk of a massive transient going through the transistor which will be activating the laptop PSU relay?

The Mega16 is WAY overspecced for this I agree, there are 2 main reasons I am using it at the moment: 1) I have a few of them lying around 2) I have a Tiny84 which I will probably be using (even that is overkill) but I don't have an Eagle library for it.

I was going to use the internal pull-down resistor for ignition_sense, I also figured that D2 won't harm (and won't cost me anything) so any extra protection is worth a squirt.

03-27-2008, 06:56 AM	#3
Shad0wca7 Newbie Join Date: Sep 2006 Posts: 39 My Photos: ()	Thanks for the input Rob, some great suggestions which I'm going to use so standby for a redesigned version using transistors. Although won't there be the risk of a massive transient going through the transistor which will be activating the laptop PSU relay? The Mega16 is WAY overspecced for this I agree, there are 2 main reasons I am using it at the moment: 1) I have a few of them lying around 2) I have a Tiny84 which I will probably be using (even that is overkill) but I don't have an Eagle library for it. I was going to use the internal pull-down resistor for ignition_sense, I also figured that D2 won't harm (and won't cost me anything) so any extra protection is worth a squirt.