Powering Raspberry Pi from Ultimaker 2 main board

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damfal003 Level 1 - Starter Points: 4
Posts: 9

Posted by
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damfal003

Posted May 2, 2015 - 3:06 PM  

I'm considering buying a raspberry pi and camera module, and installing OctoPrint, or more possibly 3DPrinterOS (due to its support for UltiGCode and access anywhere, not just on the LAN), and am wondering whether it's possible to power the Pi directly from the Arduino board of the UM2. (which I believe is an arduino Mega, right?)

Could I just power it off the 5V/GND pins (using a splitter or breadboard) if they are already in use? Or would this draw too much current from the circuit and affect the function of the printer itself?

It would be great if I could, so I can just glue the Pi onto the inside/underside of the printer and not worry about it or know it's there.

thanks

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swordriff Feel free to ask me Level: 36 Points: 1087
Posts: 543
Location: Oslo, Norway Printers: Ultimaker 2, Ultimaker 2 Go, Ultimaker 2+, Ultimaker 3
Posted by
swordriff

Posted May 2, 2015 - 3:51 PM • Edited 4:25 PM

Yes you can.

EXP 1 Pin 10, also marked TP22.

EXP 2 Pin 10 also has +5V

How much mah are you planning to sink?

Here is +5V

image1.PNG

xisle I know my way around here Level: 22 Points: 414
Posts: 135
Location: Anchorage, United States Printers: Ultimaker Original
Posted by
xisle

Posted May 2, 2015 - 9:21 PM

The Raspberry Pi has a 1.1 amp poly fuse, the Pi 2 has a 2 amp. I had my Pi 2 crash with a 700 mA supply when I added a BT USB adapter while running; I now have a 2 amp supply.

swordriff Feel free to ask me Level: 36 Points: 1087
Posts: 543
Location: Oslo, Norway Printers: Ultimaker 2, Ultimaker 2 Go, Ultimaker 2+, Ultimaker 3
Posted by
swordriff

Posted May 3, 2015 - 3:27 AM • Edited 4:08 AM

PI from UM2 PCB

Oops, maybe take it from 24V and use a blockdown converter then.http://www.dx.com/p/dc-5-36v-to-dc-1-5-32v-converter-step-down-power-module-142531#.VUXXCXBHmrU

meduza Feel free to ask me Level: 38 Points: 1208
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Location: Stockholm, Sweden Printers: Ultimaker 2, Ultimaker 2+, Ultimaker 3
Posted by
meduza

Posted May 4, 2015 - 11:27 AM

I have also been thinking about this, and since i do not have the power budget for the UM2 and cant be bothered with doing all the calculations i have been looking at using a LM2596 step-down module of the kind that costs about 1€ at eBay and connect it directly to the 24V rail from the power supply.

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fuzzhao Level 1 - Starter Points: 5
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Posted by
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fuzzhao

Posted May 8, 2015 - 4:09 PM

I've done this, I just hopped over to digi-key, picked out something that met the specs, plus a USB type-A port

Works like a charm

A DC/DC step-down from 24V should work fine, much better than using the 5V from the UM2 directly

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damfal003 Level 1 - Starter Points: 4
Posts: 9
Posted by
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damfal003

Posted May 16, 2015 - 5:50 AM

Fine, I'll do that then.

Something like this maybe: http://www.amazon.co.uk/...e-Step/dp/B00E5VGWT8

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dmolina 3D printing enthusiast Level: 11 Points: 67
Posts: 34
Location: Tbilisi, Georgia Printers: Ultimaker 2
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dmolina

Posted Jun 24, 2015 - 4:47 AM • Edited 4:57 AM

I´m kinda ashamed asking this, but here it goes...

Could somebody please point me to where can I find the correlations of pins like swordriff just posted above?

I mean, PIN 8 from EXP2 is X on the board, and then Y on Marlin, etc...

As in here for the Ultimaker v1.5.7 PCB.

I need to reassign some pins and am having a hard time finding this info...

ultiarjan Ultimaker family Level: 84 Points: 6666
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Location: Netherlands Printers: Ultimaker 2, Ultimaker 2 Go, Ultimaker 2+, Ultimaker 3
Posted by
ultiarjan

Posted Jun 24, 2015 - 6:59 AM • Edited 7:03 AM

http://tinyurl.com/q2pfzlj

maybe this will help ?

I think there have been a few changes on the board (option to turn of heater fan) but I haven't seen it on github ...

(had to use tinyurl as the forum did not accept the long url correctly, think because of the brackets in it...)

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dmolina 3D printing enthusiast Level: 11 Points: 67
Posts: 34
Location: Tbilisi, Georgia Printers: Ultimaker 2
Posted by
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dmolina

Posted Jun 24, 2015 - 7:20 AM

Quote by ultiarjan

http://tinyurl.com/q2pfzlj

maybe this will help ?

I think there have been a few changes on the board (option to turn of heater fan) but I haven't seen it on github ...

(had to use tinyurl as the forum did not accept the long url correctly, think because of the brackets in it...)

Yeah, it helps, ty. I thought it should be there somewhere. But what to the abbreviations mean? TP23, ADC0, PD7? How do I know where I can connect a thermistor, for example?

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