ZacharyIgielman
Posts: 101
Joined: Sun Dec 08, 2013 11:27 am
Location: London

UBEC: What is what?

Tue Dec 10, 2013 6:19 pm

I need to battery power my Pi with 4 AA batteries each one rated at 1.5V. I have been told not to risk powering my pi with 6V, so I have got myself this: http://r.ebay.com/mDRtEV

When it arrived, I discovered they have not labelled which are the input and which are the output connectors, and it does not have a simple red and black connector for each (positive and negative).

I want to know which group of connectors are input (5.5V-26V) and which are output (5V)? I want to know what each connector does (orange, red and brown?)? I want to know which is input positive (to be connected to the battery pack +), which is input negative (to be connected to the battery pack -), which is output positive (to be connected to the Pi's 5V pin) and which is output negative (to be connected to one of the Pi's GND pins)? Thanks for your help! Below is a link to a picture of the UBEC:

http://t.co/6iZHpGqIg6
Don't be mean, I'm only fifteen :D

Dilligaf
Posts: 283
Joined: Wed May 23, 2012 6:48 pm

Re: UBEC: What is what?

Tue Dec 10, 2013 6:54 pm

I can tell you that the bare wires are most likely input and the wires with a connector are output but am unsure why there are 3 rather than 2 wires, best to contact the seller.

EDIT You could remove the shrink wrap and trace the wires.

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rpdom
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Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: UBEC: What is what?

Tue Dec 10, 2013 7:07 pm

Dilligaf wrote:I can tell you that the bare wires are most likely input and the wires with a connector are output but am unsure why there are 3 rather than 2 wires, best to contact the seller.

EDIT You could remove the shrink wrap and trace the wires.
I think you are right about the wires.

The three-wire output is something to do with the connectors on RC devices typically being 3-pin. 0V, +V and servo-control. The third wire is probably not used on the UBEC.

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joan
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Location: UK

Re: UBEC: What is what?

Tue Dec 10, 2013 7:09 pm

The loose wires are the inputs. Red is +ve, black is -ve.

The orange wire is the control signal and is fed straight through as a convenience for ESC users (the principal market). You can ignore the orange wire.

ZacharyIgielman
Posts: 101
Joined: Sun Dec 08, 2013 11:27 am
Location: London

Re: UBEC: What is what?

Tue Dec 10, 2013 7:40 pm

joan wrote:The loose wires are the inputs. Red is +ve, black is -ve.

The orange wire is the control signal and is fed straight through as a convenience for ESC users (the principal market). You can ignore the orange wire.
Thank you very much. I made the assumption that the brown is the black wire, as it is not orange or red! So the red is + like usual, and brown is - like black is usually.
Don't be mean, I'm only fifteen :D

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joan
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Location: UK

Re: UBEC: What is what?

Tue Dec 10, 2013 7:47 pm

ZacharyIgielman wrote:
joan wrote:The loose wires are the inputs. Red is +ve, black is -ve.

The orange wire is the control signal and is fed straight through as a convenience for ESC users (the principal market). You can ignore the orange wire.
Thank you very much. I made the assumption that the brown is the black wire, as it is not orange or red! So the red is + like usual, and brown is - like black is usually.
Correct.

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Offcenter
Posts: 182
Joined: Wed Jul 31, 2013 4:57 pm
Location: Northwestern New Jersey USA

Re: UBEC: What is what?

Tue Dec 10, 2013 8:40 pm

Guys, I have been using this UBEC:
http://www.ebay.com/itm/Free-Shipping-H ... 0919605635?
In fact, the first one worked so well that I bought a second one for my second Pi.
My webserver Pi has been running 24/7 off the first one for over a month now.
I've been feeding it with 12 to 15 volts and getting a rock steady 5 volts out.
Easy to hook up, and it IS marked IN and OUT.
George in New Jersey.
(learning a little bit every day.)
(and darned confused most of the time!)

realworldnumbers
Posts: 5
Joined: Mon Dec 02, 2013 2:28 am

Re: UBEC: What is what?

Fri Dec 13, 2013 7:50 pm

I have succesfully powered my Pi and done a test on how long it can survive using only 4AA batteries :D
http://realworldnumbers.com/how-to-test ... batteries/. I got about 8.5 hours and there was no damage when pushing 6.52Volts until fully drained.

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joan
Posts: 14578
Joined: Thu Jul 05, 2012 5:09 pm
Location: UK

Re: UBEC: What is what?

Fri Dec 13, 2013 7:55 pm

realworldnumbers wrote:I have succesfully powered my Pi and done a test on how long it can survive using only 4AA batteries :D
http://realworldnumbers.com/how-to-test ... batteries/. I got about 8.5 hours and there was no damage when pushing 6.52Volts until fully drained.
AA or AAA?

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