Phobos313
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Raspberry pi 3b+ as a portable console/PC

Wed Dec 12, 2018 10:43 pm

hi. im about to buy RP 3b+ and this LCD: https://botland.com.pl/pl/wyswietlacze- ... npwH1a8nzk and 32gb SD card

and i want to make with this stuff portable PC for playing games. but i want to play on (bluetooth) mouse + keyboard and only this 8 games. and i want to avoid use emulators like retropie if it's possible.
Quake 1
Quake 2
Quake 3 arena
Doom 1
Doom 2
Duke Nukem 3D Megaton Edition
Diablo II - Lord of Destruction
Command and Conquer Red Alert 2

for a power supply i want to use 20 000mah powerbank with output
5V 2,4A

so. my questions are:
- it is even posible to make portable pc with this things? without breaking/taking apart powerbank
- do this powerbank will handle PI and LCD?
- would those games work on PI?
- if i need additional devices for that project what would it be?

llloyd
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 11:06 am

I am also wondering this as well. Different specs but similar idea, a Retro Arch build for old school game emulation but on the road, like while on a bus or something. My specs would be, once I pull the trigger and buy, be a 3B + and a SunFounder 7 " display ( https://smile.amazon.com/dp/B01J51CXU4/ ... R2A9I?th=1 ) . Is it possible or am I stuck tethered to a wall outlet?

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Imperf3kt
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 6:39 pm

Phobos313 wrote:
Wed Dec 12, 2018 10:43 pm
so. my questions are:
1 it is even posible to make portable pc with this things? without breaking/taking apart powerbank

2 do this powerbank will handle PI and LCD?

3 would those games work on PI?

4 if i need additional devices for that project what would it be?
1 yes, just plug it all together

2 probably not and I suspect the product you have is fake and not really 20,000mAh. Can you send a link to this powerbank?
There's a high chance it's either using recycled batteries or the capacity is entirely made up.
The regulator within will determine if it will run a Pi3b+ without voltage drop. So far, I haven't seen a single powerbank that can do this.

3 I have no experience in this matter, but those games are written about on this forum a lot, so maybe

4 speakers and an amplifier
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Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 6:55 pm

here is link: https://www.amazon.com/Trust-Primo-Ultr ... B01N9JU3EL
i can recharge my phone (iphone 6 16gb) lot of times (more than 6-7 times) with this power bank ( i always recharge from 20% to 100% and phone is still in use by me while it's beeing charge) but I never counted how many times i can recharge.

Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 6:58 pm

Imperf3kt wrote:
Thu Dec 13, 2018 6:39 pm
4 speakers and an amplifier
i think i will use 3.5mm jack headphones

W. H. Heydt
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 9:36 pm

Imperf3kt wrote:
Thu Dec 13, 2018 6:39 pm
2 probably not and I suspect the product you have is fake and not really 20,000mAh. Can you send a link to this powerbank?
They come in sizes in excess of 20Ah, such as this https://www.monoprice.com/product?p_id=13083 27.2Ah unit. The problem is that the Ah rating is at a nominal 3.7v and the Pi needs the step up 5v.

rexster
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 11:01 pm

Interesting project most I see is a pluggable portable PC it would be nice to have have it like a laptop thing.

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Imperf3kt
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 11:24 pm

W. H. Heydt wrote:
Thu Dec 13, 2018 9:36 pm
Imperf3kt wrote:
Thu Dec 13, 2018 6:39 pm
2 probably not and I suspect the product you have is fake and not really 20,000mAh. Can you send a link to this powerbank?
They come in sizes in excess of 20Ah, such as this https://www.monoprice.com/product?p_id=13083 27.2Ah unit. The problem is that the Ah rating is at a nominal 3.7v and the Pi needs the step up 5v.
I realise they do come in such sizes and yes, it's for the nominal 3.7v, but there are many fakes available.
https://www.phonearena.com/news/Fake-ca ... es_id78146

The only way to be sure, is to actually use one and fully charge it, then discharge it from a known current draw. Calculate the time and energy used, and you have the accurate density.
Anything can be printed on the label and people will believe it.
When you buy a jar of "1000 jelly beans", do you sit there counting to make sure you got exactly 1000 jelly beans and return it for a refund if there's only 999? Or do you look at the label, see it says "1000", look at the jar and say "looks about right" and just trust the manufacturer to be honest.
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Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Thu Dec 13, 2018 11:54 pm

Imperf3kt wrote:
Thu Dec 13, 2018 11:24 pm
W. H. Heydt wrote:
Thu Dec 13, 2018 9:36 pm
Imperf3kt wrote:
Thu Dec 13, 2018 6:39 pm
They come in sizes in excess of 20Ah, The problem is that the Ah rating is at a nominal 3.7v and the Pi needs the step up 5v.
The only way to be sure, is to actually use one and fully charge it, then discharge it from a known current draw. Calculate the time and energy used, and you have the accurate density.
in my opinion it would be easier to just try to use Pi with this powerbank... because i don't have any mesures to mesure current while discharging
and if this does not work give up portable and use phone charger (5V 2.5A) :(

rhubarbdog
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Re: Raspberry pi 3b+ as a portable console/PC

Fri Dec 14, 2018 12:46 am

I've had good success with a 7.2volt remote control car battery powering a 5 volt voltage regulator with a poly fuse in series connected to 5volt and ground gpio pins on a pi zero.
Don't omit the poly fuse if you are powering direct to gpio pins.

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Imperf3kt
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Re: Raspberry pi 3b+ as a portable console/PC

Fri Dec 14, 2018 12:56 am

You're not completely in the dark on that.
A Pi3b typicallyaverages 0.4 - 0.7A under general use.
Well use the mean of that and say 0.55A
Watt hours is more reliable than mAh so we'll convert that as well. 24,000mAh @ 3.7v comes to just under 89Wh. The Pi uses 5v, and it works out to 2.75Wh
Thr conversion from 3.7v to 5v will be about 80% efficient - you lose 20% of the power during the voltage step up.
Take 20% of 89Wh and you get about 71Wh

71/2.75=25.8 so from a fully charged battery your Pi should run for about 25 hours. Which funnily enough, is, about the same as 0.7a +20%
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HawaiianPi
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Re: Raspberry pi 3b+ as a portable console/PC

Fri Dec 14, 2018 7:53 am

Imperf3kt wrote:
Fri Dec 14, 2018 12:56 am
71/2.75=25.8 so from a fully charged battery your Pi should run for about 25 hours. Which funnily enough, is, about the same as 0.7a +20%
What about the screen ... and the fact that it will be used for gaming.

@OP,
For a portable gaming rig that will be run from batteries I'd recommend a smaller, lower resolutions screen. Fewer pixels to push for higher FPS and less power consumption for longer battery life.

The potential problem with using anything designed to charge phone batteries is that charging phones does not require precise voltage control, and because of that, some phone chargers have very poor regulation under load. I have tested 5V/2.4A chargers that dipped well below 5V at only a 1A load. That's not to say they are all that way. I have a power bank for my phone which is rated for 5V/2.4A that was able to deliver over 2.8A at 5V+ when I load tested it. Of course you'll never know what your phone charger can deliver util you load test it.
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?

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davidcoton
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Re: Raspberry pi 3b+ as a portable console/PC

Fri Dec 14, 2018 1:27 pm

Imperf3kt wrote:
Fri Dec 14, 2018 12:56 am
A Pi3b typicallyaverages 0.4 - 0.7A under general use.
Well use the mean of that and say 0.55A
Watt hours is more reliable than mAh so we'll convert that as well. 24,000mAh @ 3.7v comes to just under 89Wh. The Pi uses 5v, and it works out to 2.75Wh
FTFY (The Pi's consumption, 5V x 0.7A, is in Watts (W) not Watt-hours(Wh).
Thus when you divide the battery capacity (Wh) by the Pi's consumption (W) you get the run-time in hours).

Except, as noted above, you need to allow for the screen consumption as well.
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Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Mon Dec 17, 2018 5:34 pm

ohhh, too much math :D :D :D the thing is i want to use it for MAX 5h per day ON BATTERY (during boring lessons in school :D :D ) in home i will use it on regular phone charger. soo simply put, will it work with this power bank? without randomly PI shutting down or other issues?

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davidcoton
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Re: Raspberry pi 3b+ as a portable console/PC

Mon Dec 17, 2018 11:19 pm

Maybe if you concentrated on the "boring" lessons instead of playing games in class you would be able to cope with the maths.

But first you need to know the current (A) or power (W) used by your screen.

BTW, many "regular phoner chargers" do not work well with Pi computers, becausse they do not maintain 5V when the full current is being used. Better to get the "official" PSU which is of known good quality and is fit for purpose.
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Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Mon Dec 17, 2018 11:46 pm

davidcoton wrote:
Mon Dec 17, 2018 11:19 pm
Maybe if you concentrated on the "boring" lessons instead of playing games in class you would be able to cope with the maths.
it was a joke, i'm good at maths and calculating watts ampers etc...I am in an electrician school.... but. the thing is i don't have this screen physically
in my hands sooo i can't mesure (i bought one current meter(?) sinc my last post when i said that i don't have it) power consumption and i can't find any tech. specs. on internet about this screen. and i don't want to waste the money on buying this screen because it might be not usefull. and it's quite expensive for me

Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Mon Dec 17, 2018 11:48 pm

and i don't want 3,5 inch screen because it is too small

Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Mon Dec 17, 2018 11:55 pm

davidcoton wrote:
Mon Dec 17, 2018 11:19 pm
Better to get the "official" PSU which is of known good quality and is fit for purpose.
yes.. but in my country is nearly impossible to find offical rasp charger. or when you find one cost of offical charger is nearly half of rasperry cost. RPI costs 170PLN and charger (offical) costs 100PLN

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davidcoton
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Re: Raspberry pi 3b+ as a portable console/PC

Tue Dec 18, 2018 12:03 am

Phobos313 wrote:
Mon Dec 17, 2018 11:55 pm
davidcoton wrote:
Mon Dec 17, 2018 11:19 pm
Better to get the "official" PSU which is of known good quality and is fit for purpose.
yes.. but in my country is nearly impossible to find offical rasp charger. or when you find one cost of offical charger is nearly half of rasperry cost. RPI costs 170PLN and charger (offical) costs 100PLN
But since your country is unknown to most of us, you can expect to get inappropriate advice.
It is useful to put at least your country (and possibly your town) in the Location part of your profile.
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Phobos313
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Re: Raspberry pi 3b+ as a portable console/PC

Tue Dec 18, 2018 12:06 am

i didin't done that? i thought i did. gotta fix that

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Imperf3kt
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Re: Raspberry pi 3b+ as a portable console/PC

Tue Dec 18, 2018 12:43 am

A cheap 5 inch LCD screen is most likely using a CCFL backlight.
Generally, these consume around 300mA, from personal testing on several.

While not an exact figure, it is enough to gauge a guestimated run time from fully charged, fresh batteries. (old batteries lose capacity with age and use)

At this current, the screen will consume roughly 12 hours worth of the previously calculated battery life.

You should see around 13 hour of run time after adding the screen.
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aamir24
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Re: Raspberry pi 3b+ as a portable console/PC

Fri May 03, 2019 10:12 pm

Making a raspberry pi a portable pc or console is good idea , but there is a question how much time did the setup portable ??

Here i have made a nice portable setup to use raspberry pi as a portable desktop computer which runs up to 15 hours without electricity. I am using a portable monitor , wireless keyboard and mouse and a 20,000 mAh power bank.

Here is the build of my setup: https://youtu.be/YEpSIwa0XWQ

Hope you will like this , reply what you think :roll:

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