Justincoty
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Zero w alternative power source

Mon Jan 15, 2018 2:43 am

I am making a camera to attach to my rc car and need help on an alternative power supply as I cannot remain tethered via usb otg. I have read numerous statements that one can use a ubec with battery li-on batteries but was wondering what would be the easiest way to power the zero w.

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Gavinmc42
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Re: Zero w alternative power source

Mon Jan 15, 2018 4:43 am

Small USB power bank?
Easy to use, easy to charge.
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HawaiianPi
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Re: Zero w alternative power source

Mon Jan 15, 2018 11:42 am

USB power bank.

Although a UBEC (DC-DC converter) to tap power from your RC car's battery would weigh less.
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Justincoty
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Re: Zero w alternative power source

Mon Jan 15, 2018 2:10 pm

Power banks seem to be the consensus on a lot of different forums. I'll have to look into that. However a drawback is that most powerbanks are fairly heavy.

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FTrevorGowen
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Re: Zero w alternative power source

Mon Jan 15, 2018 9:58 pm

Justincoty wrote: Power banks seem to be the consensus on a lot of different forums. I'll have to look into that. However a drawback is that most powerbanks are fairly heavy.
The weight will depend upon the powerbank's capacity (ie. how many mAh or "battery size") - that also determines how long the pi0w can remain powerd on for of course. Whilst I don't have any info. on their weights, FWIW, here is some info. on powerbanks I've used/tested:
http://www.cpmspectrepi.uk/raspberry_pi ... 2FChargers
Trev.
Edit: Link corrected to be the one "at the top of the list"
Usually running Raspbian Jessie on up to 9 of 13 Pi's (an A, B1, B2, B+, P2B, 3xP0, P0W) and Stretch on my P3B, B+, A+ and a B2. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Imperf3kt
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Re: Zero w alternative power source

Mon Jan 15, 2018 10:47 pm

You will need to make sure the RC car runs out of power, before the Pi, so you can cleanly shut down and avoid corruption.

One of these incredibly light, credit-card sized powerbanks should be ample for a Pi0W
https://www.ebay.com.au/itm/Eveready-25 ... 2144257311
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Gavinmc42
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Re: Zero w alternative power source

Tue Jan 16, 2018 1:48 am

I have yet to try it but Zero's can be powered direct from a LiPo.
5V is only needed for USB/HDMI.
Even a small 3.7V 180mahr cell should give you about an 1/2 hour.
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MarkTF
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Re: Zero w alternative power source

Wed Jan 17, 2018 10:39 pm

Gavinmc42 wrote:
Tue Jan 16, 2018 1:48 am
I have yet to try it but Zero's can be powered direct from a LiPo.
How so? Do you mean directly attaching a LiPo the "+3V3 OUT" pins bypassing a regulator or do you mean a LiPo to the "+5V" pins?

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Imperf3kt
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Re: Zero w alternative power source

Thu Jan 18, 2018 3:03 am

MarkTF wrote:
Wed Jan 17, 2018 10:39 pm
Gavinmc42 wrote:
Tue Jan 16, 2018 1:48 am
I have yet to try it but Zero's can be powered direct from a LiPo.
How so? Do you mean directly attaching a LiPo the "+3V3 OUT" pins bypassing a regulator or do you mean a LiPo to the "+5V" pins?
Connect it to the 5v pins and say goodbye to most USB devices and possibly HDMI as well, but otherwise it'll work just fine for a while.

Avoid button cell and similar batteries, they lack the output requirements. Stick with LiPo or LiIon
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Gavinmc42
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Re: Zero w alternative power source

Thu Jan 18, 2018 3:12 am

To the 5V on the header should be ok.
On old schematics this goes to Vbat on the BCM2835.

Never put battery on the 3V3
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