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Pi powered Pi.....

Posted: Wed Jan 13, 2016 6:28 pm
by kghunt
:-)
https://www.dropbox.com/s/hu62ibo7dyljb ... 8.jpg?dl=0

They are becoming self sufficient.

I had better watch my back...

Re: Pi powered Pi.....

Posted: Wed Jan 13, 2016 6:47 pm
by fruitoftheloom
kghunt wrote::-)
https://www.dropbox.com/s/hu62ibo7dyljb ... 8.jpg?dl=0

They are becoming self sufficient.

I had better watch my back...
Even better is experimental "Gadget" Mode, just a OTG Cable needed:

viewtopic.php?f=63&t=130815#p874890

Re: Pi powered Pi.....

Posted: Thu Jan 14, 2016 3:01 am
by solar3000
I wouldn't do that. The second pi isn't getting enough energy. Either not enough voltage or not enough current. Also the pi zero won't complain if its not getting enough energy - it just acts strangely.

Yeah, don't do it.

Re: Pi powered Pi.....

Posted: Thu Jan 14, 2016 6:34 am
by kghunt
Seems to work fine for me. I have a good power supply and the pi zero only pulls around 200mah which is less than my 3g Dongle that I use with the pi2.

If my pi2 was maxed out or had loads plugged into it I could maybe see that. But all I have is the zero and a WiFi adapter and the 2 isn't doing anything taxing.

Re: Pi powered Pi.....

Posted: Thu Jan 14, 2016 6:36 pm
by solar3000
Wish I could explain it better. Well, good luck. Keep an eye on their uptimes.

Re: Pi powered Pi.....

Posted: Thu Jan 14, 2016 7:02 pm
by kghunt
You don't need to. I'm no noob. I'm a Linux system administrator I have over a dozen pi's and have had one since the initial batch in 2012. ( which is now in a data centre in Austria with 525 days uptime.)

I understand perfectly well how sensitive they are to voltage drop etc I have corrupted many SD cards and reflashed them in 5 minutes. That never stops me playing :-).

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 6:32 am
by pikaede
is that a DIY case ? or you bought is somewhere ?

looks retro and cool :lol:

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 6:38 am
by kghunt
It's pretty amazing. It's a 3d printed one. I brought it off a guy on Etsy for £13 plus delivery.

I got some stickers coming to put a Pitendo logo on the flap.

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 10:35 am
by DougieLawson
solar3000 wrote:I wouldn't do that. The second pi isn't getting enough energy. Either not enough voltage or not enough current. Also the pi zero won't complain if its not getting enough energy - it just acts strangely.

Yeah, don't do it.
Balderdash and poppycock. I ran my Zero like that for the first week with an ENC28J60 attached so that it could reach the network. The Zero was only cut loose from it's umbilical cord when the WiFi dongle and the USB-B / microUSB shim turned up.

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 2:14 pm
by solar3000
kghunt wrote:You don't need to. I'm no noob. I'm a Linux system administrator I have over a dozen pi's and have had one since the initial batch in 2012. ( which is now in a data centre in Austria with 525 days uptime.)

I understand perfectly well how sensitive they are to voltage drop etc I have corrupted many SD cards and reflashed them in 5 minutes. That never stops me playing :-).
Ah! Sorry, I thought you were. Your question was.

I had a 'footnote' I didn't post. And that is if properly wired it can be done. But I didn't want to complicate things. Many USB cables use cheap 28 gauge wiring.

But I still wouldn't do it. *

* without a good reason.

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 2:16 pm
by solar3000
DougieLawson wrote:
solar3000 wrote:I wouldn't do that. The second pi isn't getting enough energy. Either not enough voltage or not enough current. Also the pi zero won't complain if its not getting enough energy - it just acts strangely.

Yeah, don't do it.
Balderdash and poppycock. I ran my Zero like that for the first week with an ENC28J60 attached so that it could reach the network. The Zero was only cut loose from it's umbilical cord when the WiFi dongle and the USB-B / microUSB shim turned up.
Don't mean any harm, but:
Image

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 2:33 pm
by Heater
This is what I love about the internet.

One guy says a thing works because he's been doing it for ages without problem.

Another guy says "don't do that" because, well, no good reason.

Great.

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 3:46 pm
by Burngate
I was going to write "One guy's corner case is another guy's ..." but I don't know the antonym of corner case.

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 6:13 pm
by DougieLawson
My Zero was running from a 2B with max_usb_current=1, a good USB cable and the 2B powered with the official 2.1A power supply. I'll stick with my balderdash and poppycock assertion because it is balderdash and poppycock that is being emitted by the Solar3000 unit.

Re: Pi powered Pi.....

Posted: Fri Jan 15, 2016 6:45 pm
by solar3000
Alright. I'll halt before the admins:

Image

I won't be the one to cause it.

Re: Pi powered Pi.....

Posted: Mon Jan 18, 2016 2:01 pm
by kghunt
In case anyone is interested I have made a Pitendo logo for the front flap of my case. I have printed them onto clear laser sticker/decal paper.

I have attached the files in case anyone wants to print their own.