Vairetz
Posts: 32
Joined: Wed Apr 27, 2016 4:54 pm

Power up Raspberry Pi from GPIO pins

Sat Apr 21, 2018 2:25 pm

Hi guys, I've made a little circuit that can power my Raspberry Pi through GPIO from a 3.7V litium battery. I have 5V in output and I connect the power at 2nd pin and ground at pin 6 but my Raspberry turns on only without SD card and I don't understand why. I missed a configuration on Raspbian?
I made a site with a raspi projects' collection, my idea is sharing my projects with other person.
My web site is https://raspiproject.altervista.org/ I hope you like it and you want work with me

drgeoff
Posts: 8343
Joined: Wed Jan 25, 2012 6:39 pm

Re: Power up Raspberry Pi from GPIO pins

Sat Apr 21, 2018 2:41 pm

No, there is no extra configuration needed (or even existing) to power via the GPIO header. Sounds like your power circuit is not able to provide sufficient current.

Have you measured the voltage when the RPi with SD card is connected to the power circuit?

alphanumeric
Posts: 1515
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Power up Raspberry Pi from GPIO pins

Sun Apr 22, 2018 12:38 pm

As mentioned, nothing needs to be done in Raspbian. I have several Pi's powered that way. The Pi should boot up just like it does when powered via the Micro USB port.

Vairetz
Posts: 32
Joined: Wed Apr 27, 2016 4:54 pm

Re: Power up Raspberry Pi from GPIO pins

Sun Apr 22, 2018 2:22 pm

Minimum current to power up Raspberry Pi from GPIO is 1A or more?
I made a site with a raspi projects' collection, my idea is sharing my projects with other person.
My web site is https://raspiproject.altervista.org/ I hope you like it and you want work with me

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bensimmo
Posts: 2986
Joined: Sun Dec 28, 2014 3:02 pm
Location: East Yorkshire

Re: Power up Raspberry Pi from GPIO pins

Sun Apr 22, 2018 4:04 pm

Which Pi?
PiZero and A+ will be fine
Pi2B iirc from mine is fine.
Pi3B is pushing it with 1A, but should do it.
Pi3B+ probably wouldn't.

Also your cables may be dropping the voltage, check what Voltage is at the actual GPIO pins try moving it to 5.1V, but no higher than 5.2V.

What convertor are you using ?

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bensimmo
Posts: 2986
Joined: Sun Dec 28, 2014 3:02 pm
Location: East Yorkshire

Re: Power up Raspberry Pi from GPIO pins

Sun Apr 22, 2018 4:05 pm

Also does the SD card work when powered normally?

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Imperf3kt
Posts: 1116
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: Power up Raspberry Pi from GPIO pins

Mon Apr 23, 2018 12:46 am

My Pi3B works just fine from ~0.6A
1A should be enough in most cases.
User experiencing technical difficulties.

alphanumeric
Posts: 1515
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Power up Raspberry Pi from GPIO pins

Mon Apr 23, 2018 8:49 am

Imperf3kt wrote:
Mon Apr 23, 2018 12:46 am
My Pi3B works just fine from ~0.6A
1A should be enough in most cases.
If you don't have anything other than a keyboard mouse connected. ;) Start adding GPIO displays and or other Hats and that all changes.

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