darkaragon
Posts: 3
Joined: Thu May 07, 2015 3:03 pm

Project idea from a beginner.

Thu May 07, 2015 8:29 pm

Hello all,

I am thinking of getting into the Raspberry Pi world and as the person I am, I don't like to start small. I learn quicker when I run.

I would like to build 2 RPi's in my car, but both powered on if possible within the same electric circuit. Each having a screen and WiFi of its own. Only the main screen (center dash) would have Bluetooth keyboard/mouse. Screen 2 would be on passenger side, reading my OBDII and log all events (yes, track day car). I have a attached a little paint diagram to make things clearer.

I am aware that there are ready made solutions out there, but not for the price of RPi. Also, we prefer to do everything on the car ourselves.

I would appreciate any suggestions regarding the power supply for this project (and any improvements to the idea).

Regards,

Red

toxibunny
Posts: 1382
Joined: Thu Aug 18, 2011 9:21 pm

Re: Project idea from a beginner.

Fri May 08, 2015 7:12 am

No need for 2 Pis - you can just attach 2 screens to 1 pi...
note: I may or may not know what I'm talking about...

BMS Doug
Posts: 3824
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Project idea from a beginner.

Fri May 08, 2015 7:13 am

Your paint drawing didn't attach, maybe the file size was too large, try saving it as a GIF.

this may help with OBDII, adding a separate display should be simple.

Any 5V 5A UBEC will work as a power supply for 2 Pi's.
Doug.
Building Management Systems Engineer.

darkaragon
Posts: 3
Joined: Thu May 07, 2015 3:03 pm

Re: Project idea from a beginner.

Fri May 08, 2015 11:58 am

toxibunny wrote:No need for 2 Pis - you can just attach 2 screens to 1 pi...
Both screens running separate software at the same time without interference?

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kusti8
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Location: USA

Re: Project idea from a beginner.

Fri May 08, 2015 11:59 am

darkaragon wrote:
toxibunny wrote:No need for 2 Pis - you can just attach 2 screens to 1 pi...
Both screens running separate software at the same time without interference?
That you cannot do. You can only use a splitter to have the same picture on both screens.
There are 10 types of people: those who understand binary and those who don't.

ame
Posts: 3172
Joined: Sat Aug 18, 2012 1:21 am
Location: Korea

Re: Project idea from a beginner.

Fri May 08, 2015 12:02 pm

darkaragon wrote:
toxibunny wrote:No need for 2 Pis - you can just attach 2 screens to 1 pi...
Both screens running separate software at the same time without interference?
Linux is a multi-user, multi-processing system. If the hardware is powerful enough it can service many users, with a display each, without them interfering with each other.

Maybe you are most familiar with Windows, which actively prevents more than one user using the system at the same time.

Anyway, you could have two displays, and each one is a different Linux device. Just configure your software to output to the desired device and it will work as you expect.

Ignore kusti8.

BMS Doug
Posts: 3824
Joined: Thu Mar 27, 2014 2:42 pm
Location: London, UK

Re: Project idea from a beginner.

Fri May 08, 2015 12:16 pm

ame wrote:
darkaragon wrote:
toxibunny wrote:No need for 2 Pis - you can just attach 2 screens to 1 pi...
Both screens running separate software at the same time without interference?
Linux is a multi-user, multi-processing system. If the hardware is powerful enough it can service many users, with a display each, without them interfering with each other.

Maybe you are most familiar with Windows, which actively prevents more than one user using the system at the same time.

Anyway, you could have two displays, and each one is a different Linux device. Just configure your software to output to the desired device and it will work as you expect.

Ignore kusti8.
You will need to choose your displays carefully but a Pi 2 could easily output to two screens for your application.
Doug.
Building Management Systems Engineer.

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kusti8
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Location: USA

Re: Project idea from a beginner.

Fri May 08, 2015 12:30 pm

ame wrote:
darkaragon wrote:
toxibunny wrote:No need for 2 Pis - you can just attach 2 screens to 1 pi...
Both screens running separate software at the same time without interference?
Linux is a multi-user, multi-processing system. If the hardware is powerful enough it can service many users, with a display each, without them interfering with each other.

Maybe you are most familiar with Windows, which actively prevents more than one user using the system at the same time.

Anyway, you could have two displays, and each one is a different Linux device. Just configure your software to output to the desired device and it will work as you expect.

Ignore kusti8.

"each one is a different Linux device?"

AFAIK you cannot output on both AV and HDMI. There is no DSI and as far as I have seen Gert's VGA666 has the possibilty, but it hasn't been done.

I'm confused. What are you saying?
There are 10 types of people: those who understand binary and those who don't.

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ragnarjensen
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Re: Project idea from a beginner.

Fri May 08, 2015 4:32 pm

There are a plethora of SPI and USB displays available. Each has its own framebuffer.
I have a lowly RPiBv2 that handles four displays, HDMI + PiTFT + 2xUSB DisplayLink, quite nicely.

There was a thread about multi-display in a mobile home a while ago: viewtopic.php?p=664766
--
Ragnar

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kusti8
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Location: USA

Re: Project idea from a beginner.

Fri May 08, 2015 7:10 pm

Ah...

Forgot about that. :oops:
There are 10 types of people: those who understand binary and those who don't.

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