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BirchJD
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Raspberry Pi Battery Powered Portable Hand Held MAME Console

Wed Jan 16, 2013 11:48 pm

Video demonstration of the project can be viewed here:
http://youtu.be/zHf1zekGfaE

I will post a link to a write up here in a few days, when I have had a chance to write it.
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BirchJD
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Sun Jan 20, 2013 11:29 pm

I have now written full details of the project and they can be found here:
http://www.newsdownload.co.uk/pages/RPi ... dHeld.html
http://www.newsdownload.co.uk/

alias_neo
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Tue Jan 29, 2013 1:47 pm

Just wanted to chime in when I saw this had had no replies yet to say, beautiful piece of work.

I love the way you've used the jack plugs, I assume one is passing power too from the battery pack?
http://2byt.es - Just my two bytes - RPi - Android - Arduino - Blog

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BirchJD
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Wed Jan 30, 2013 12:15 am

Thank you. Yes the power is powering the Raspberry Pi from the battery pack. It powers for 2.5 hours on 6 x AA 2400mAh Ni-MH rechargeable batteries.

The project is currently on hold until the Model A comes out, to reduce any rework. I have a switch mode regulator rather than the 7805 regulator. This is supposed to make a significant difference to power consumption, the 7805 is apparently about 55% efficient, the switch mode is apparently about 95% efficient. With the Model A drawing less current too, I am expecting significantly longer battery life.
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BirchJD
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Sat Feb 02, 2013 12:34 pm

I have now tried a switched mode regulator with this project and the project will now be powered for 3.17 as opposed to 2.5 hours just by using the alternate regulator.

Details can be found at the bottom of the project page:

http://www.newsdownload.co.uk/pages/RPi ... dHeld.html
http://www.newsdownload.co.uk/

alias_neo
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Sat Feb 02, 2013 12:44 pm

I suppose you get what you pay for, since the switching mode regulator is almost 7 pounds, as opposed to the sub-pound price of the 7805.

What's the display like? I was considering one for showing some stats on, but I imagine the S-Video only connections mean sharpness is unlikely.

I've been unable to find anything of similar size that is DVI compatible.
http://2byt.es - Just my two bytes - RPi - Android - Arduino - Blog

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BirchJD
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Sat Feb 02, 2013 1:11 pm

I've tried two displays, I purchased them both because they are low price, £15 and £20. They could not be described as sharp, and they are only any good at a very low resolution. Both purchased from eBay, search for "reverse LCD" and you'll find the kind of thing I am using:

http://www.ebay.co.uk/sch/i.html?LH_Ite ... c&LH_BIN=1
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Wasp_Box
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Location: UK

Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Sat Feb 02, 2013 6:37 pm

Excellent stuff. I ordered a 3.5" vga screen with something like this in mind but you've done it so much better than I could. Promptly nicking everything (if that's OK)

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BirchJD
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Re: Raspberry Pi Battery Powered Portable Hand Held MAME Con

Sat Feb 02, 2013 9:15 pm

Sure, I only came accross the switch mode regulator by reading forums like this. I have some more ideas for little updates to this project, once you get going there is a snowball effect.
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