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Sun Nov 04, 2012 5:16 pm

Ok, I am making a unit, that will contain my pi, A powered usb hub (converted from a cheap standard one), a keyboard/mouse combo and a screen, all in the one unit.

However, I really dont want to have to have 3 power cables trailing out of it. So what i want to know is how easy would it be to get/make a power PSU, so i can just have the one cable, and internally it powers everything?

any advice? or even just some pointers to get me started?
dan3008 wrote:Pays your money, takes your choice

Posts: 1172
Joined: Wed Aug 15, 2012 1:05 pm


Sun Nov 04, 2012 7:16 pm

Additional information.

3 required outputs are:
Screen - 12v DC
USB hub - 5v
and pi - 5v

Not sure on amps for the first 2, but the pi needs to be atleast 700 mA

for all 3 i have wires with exposed ends, that i can either solder straight onto a board, or I can attach to a plug.

Still searching for answers :/
dan3008 wrote:Pays your money, takes your choice

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Sun Nov 04, 2012 7:58 pm

I have parts on order to do something similar. I will have a toggle switch on the front of my chassis so I can select my 12V source to be either from a small sealed lead acid battery or a switching power supply. I am converting the 12V to 5V with a car cigarette lighter adapter from mediabridge; you could also use a DC to DC convertor. The adapter accepts 12V on its input and has two 5v outputs, one at 2.1 amps and the other at 1 amp. I will be using one of the outputs to power the pi and the other to power the coils of my 8 channel relay bank. You really need to know the power requirements of all your devices to make sure that your 12V source and the 5V outputs can handle the load.
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Sun Nov 04, 2012 8:00 pm

Hi Dan, sounds like my original goal (have since decided against a hard drive) I'm too lazy to write it all again so check out this link http://forum.stmlabs.com/showthread.php?tid=3918 Specifically the last halt of the post.

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Mon Nov 05, 2012 5:26 am

I've done something similar with my 'PiSU'
It uses the IEC power plug, wired into a 5v switch mode power supply which I've then wired to the Pi and Hub.
Dealextreme have both a 12v and 5v switch mode power supply available which could do what you need to do.
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Tue Nov 06, 2012 9:59 am

I've started work using a 12 v mains addaptor which plugs into this
I then take one feed for my 12v screen, and one feed into this to get 2 5v feeds for my pi and hub. I wanted all 4 ports on my hub, otherwise i'd have powerd my pi from the hub too.
dan3008 wrote:Pays your money, takes your choice

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