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[DISCUSSION] LattePanda in Car

Posted: Tue Jun 07, 2016 9:18 pm
by lextar
Hi all,
I want to install lattePanda in my car and create my own 2 din headunit.

I just need if it is possible to power on the board using the ignition switch (+12v).
It would be nice to power the board from the battery and use the ignition switch signal instead of the power button. Is it possible ?

Thank you
Alex

Re: lattePanda in car

Posted: Tue Jun 07, 2016 11:40 pm
by JimDrew
If you update the BIOS with the "auto-boot" version you could power the LP from the ignition source and it would boot when you turned the key to accessory/run. However, you would need to be careful about a brown-out condition while the starter was engaged. If you turned the key to accessory position for a few seconds, the LP would start to boot and when you engaged the starter it could interrupt the boot sequence which could corrupt Windows. You would probably need a big cap on the 12v line to the LP to prevent this problem.

Re: lattePanda in car

Posted: Wed Jun 08, 2016 8:21 am
by lextar
Thank you, I never thought about this problem! Another problem is that if I turn off the car, the LP will not shut down properly. I think that shutting down the LP in this way will also corrupt windows.

In the meanwhile I also found this raspberry pi module:
https://mausberry-circuits.myshopify.co ... ply-switch

maybe does it work with LP? It connects to the GPIO pins

Re: lattePanda in car

Posted: Wed Jun 08, 2016 5:40 pm
by schluej
Search for step down power supply on eBay or Amazon...

Re: lattePanda in car

Posted: Wed Jun 08, 2016 7:46 pm
by lextar
Do you mean something like this?
http://www.ebay.it/itm/DC-DC-CC-CV-Buck ... Sw5dNWlMm5

but it does not handle the shutdown of the machine!
I mean, if I switch off the keyswitch of the car, LP will be powered off without proper windows shutdown...

Re: lattePanda in car

Posted: Thu Jun 09, 2016 12:48 am
by barryn
Install a small rechargeable battery with charger. Will then be an "in-line" micro-UPS system, rather than just a power cable. This will give you time to power down. I don't know yet if the LP has a method to detect a power down signal and close down or hibernate the unit...

Re: lattePanda in car

Posted: Thu Jun 09, 2016 10:59 am
by itscervo
You could power on/off by setting the pc to sleep when you press the power button & use the latched on/off relay setup in the link, but don't reduce the voltage output :D .
http://www.the12volt.com/relays/page5.asp#lsp

Re: lattePanda in car

Posted: Thu Jun 09, 2016 10:58 pm
by 3kg
it's no easy quest to power and run the LP in car. and it's a straight though quest if you want it employed in the ignition circuitry.
# avoid c peaks and drops
# provide steady i
# cool it
# shield it
# provide power when ign is off / LP should be sleep, prob. somewhere 0.5W
# ensure proper sleep mode/booting/starting etc.
# in case certain car functions should be controlled by LP - no good idea really

there are some useful items on the market, special but available for power supply, see for inspiration:
http://www.mini-box.com/DCDC-USB?sc=8&category=981

Re: lattePanda in car

Posted: Sat Jun 11, 2016 4:07 pm
by schluej
Moin Moin,
I found only some thing like this
http://stest1.etnetera.cz/ad/current/co ... 004_en.pdf

And will this help u: http://www.mini-box.com/OpenUPS2

Re: lattePanda in car

Posted: Sun Jun 12, 2016 5:35 pm
by lextar
Thank you all for all the solutions posted!
I also found this:

http://www.mini-box.com/DCDC-USB?sc=8&category=981

Reading here i found that this device can send over USB the shutdown/standby signal:

http://driveshell.com/posts/t2076-NUC-Car-PC-build