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MPX.3 powering Raspberry Pi ?

Posted by DaHai8 
MPX.3 powering Raspberry Pi ?
July 27, 2016 01:24AM
I have an MPX.3 3D Printer Controller board:

I know very little about it but believe it is a MKS Base 1.x clone:

MKS Base 1.x

There are connectors on this board that I THINK are 5v out, but I can't find any documentation on them.

What I'd like to do is power my Raspberry Pi 3B off the 3D Printer board. It's running OctoPi and I thought it would be nice if I could fully integrate it into the printer and not run an addition power cord/psu to it. I know this may be a stupid idea.

Does anyone know if any of the 'unused' pins on my HicTop board supply 5v @ at least 2.5Amp? Or does anyone have schematics/pinouts of this board that I can use?
Or is this just a really dumb idea?

Re: MPX.3 powering Raspberry Pi ?
July 27, 2016 01:57AM
Sorry its the latter

Most controller boards have voltage regulators for less than 1amp, cannot run a Raspberry Pi from them.

The voltage regulator is probably the 5 pin package to the right of the mosfets, see if you can read any numbers off of that

Edited 1 time(s). Last edit at 07/27/2016 02:00AM by Dust.
Re: MPX.3 powering Raspberry Pi ?
July 27, 2016 02:49AM
Wow! Thanks for the quick reply!
The 5-pin regulator says:

-5.0 P

Pretty sure that's what's written on it.

The Datasheet on it says "Guaranteed 1.0 A Output Current", so looks like you're right, its not enough to power a PI. Bummer.

But thanks for telling me where to look for what I needed to know!!!!

Re: MPX.3 powering Raspberry Pi ?
July 27, 2016 05:40PM
Get a 12V to 5V switching regulator and run the Pi off of the 12V supply.

Re: MPX.3 powering Raspberry Pi ?
July 28, 2016 01:14AM
I found something similar:


And had already ordered it. Bummer. Your's has the mini usb connector and the UBEC doesn't.
Oh well, just a little soldering....
Re: MPX.3 powering Raspberry Pi ?
July 28, 2016 07:01AM
That will work also. If you don't want to cut up a USB cable Adafruit has a micro USB DIY connector with solder pads and a plastic shell.
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