Alpha/Delta as CarPC

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Andy_Mac
Posts: 2
Joined: Sat May 25, 2019 8:17 am

Tue May 28, 2019 11:12 am

Hey guys,

Tossing up getting one of these for a CarPC setup. Have seen another thread on here about it but not much of a conclusion was drawn on the best way to go about it.
Currently running a Nexus 7 with the Timur ROM which works well but have got a new aftermarket ECU that doesn't play nice with Android so very little information can be pulled out of it without heaps and heaps of work. A solution using Windows would be ideal as it'll allow me to run the ECU makers own software for drama free compatibility.

My initial thoughts were to use a UPS power supply from mini-box as it can provide power to the DC in pins on the board and has a USB connection which allows it to appear as a battery in windows. I imagined this would allow me to set the power configuration in windows to hibernate/shutdown after say 1min when the power supply from the ACC circuit is disconnected.

I've been thinking about it some more and I'm no longer sure that will work as I think the power supply will show up as a battery at all times and not just when supply power is disconnected (had been picturing it would behave as a laptop battery does).

The other way would be to have it fed off an always live circuit and use one of their other power supplies that can give an on/off pulse and use that attached to the on/off switch on the board instead.

Does anyone have any insights or experience with this? I'm super keen to start making some progress on the transition to windows and the power supply seems to be the biggest hurdle so far.

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ccs_hello
Posts: 440
Joined: Sat Oct 13, 2018 9:16 pm

Wed May 29, 2019 9:01 am

Standard Car-PC design has
1. a proper power conditioning unit (e.g., DC 12V to DC 12V synchronous buck-boost inverter with large filter capacitor) plus
OV/OC (and under voltage lockout) should be in the power path
2. a small secondary 12V battery or a very large array of super-capacitor bank to supply-augment power when cranking the engine
3. a PC-power sequencing state machine that knows the proper moment to power-on, sleep/shutdown the PC
4. a part of the above sections is always_on

There are commercial products specifically designed for such purpose. Know you own requirements!!
Certainly one can DIY so long as enough study is part of the process.
(Some nice vendors release good user manuals. Quite a bit of information is buried there.)

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Andy_Mac
Posts: 2
Joined: Sat May 25, 2019 8:17 am

Wed May 29, 2019 10:27 am

Any links/sites/brands that will help with further research?

From what I'd researched so far the OpenUPS seemed like a solid solution with the buck/boost regulated output.
Others seem to do ok with much simpler dc-dc atx supplies on more traditional motherboards.

http://www.mini-box.com/OpenUPS

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ccs_hello
Posts: 440
Joined: Sat Oct 13, 2018 9:16 pm

Wed May 29, 2019 9:55 pm

Please check its PICO-PSU series of products.
(Basically the timing and sequencing features...)

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Torn
Posts: 15
Joined: Sat May 19, 2018 9:45 am

Sat Nov 30, 2019 12:51 pm

Css - you make it sound more complex then it is. On my carpc i used a pico power supply, with a delay trigger to power on/hibernate. (I will have to go look to get ya name of the auto trigger) it is set on a 7 second delay for power on. I am not sure if this will work well for the lattepanda boards because of the need to hold the power button for several seconds. It does work to shut it down though. Have to use windows settings and setup what happens when the power button is pressed. I have not updated my alpha bios to auto on yet so have nit tested that theory. I have a week off work coming up and I plan on testing my ideas to see if/how well they work. Should they work well I will build a guide on solving the auto on/off problems these have for CarPc usage (manual auto on / off is easy, but meh who wants to turn the pc on and off everytime you get in the car..)

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