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(Hack A Day)   Raspberry-pi array, the kind you find in an online store. Raspberry-pi array, and if it was warm you need to cool it some more   (hackaday.com) divider line
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1056 clicks; posted to STEM » on 26 Oct 2020 at 3:46 PM (4 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



17 Comments     (+0 »)
 
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2020-10-26 1:46:19 PM  
*spins up 96 docker instances*

Cluster what now?
 
2020-10-26 2:51:19 PM  
I'd be happy to get just one Raspberry Pi 4 right now.  Really want to play with one.
 
2020-10-26 3:53:21 PM  
Imagine a Beowulf cluster of those.
 
2020-10-26 3:56:28 PM  

vrax: I'd be happy to get just one Raspberry Pi 4 right now.  Really want to play with one.


You're in luck. They are sold and they are pretty cheap. They'll even mail them to you. https://www.raspberrypi.org/prod​ucts/r​aspberry-pi-4-model-b/?variant=raspber​ry-pi-4-model-b-8gb&resellerType=home
 
2020-10-26 3:57:29 PM  

vrax: I'd be happy to get just one Raspberry Pi 4 right now.  Really want to play with one.


Do you live anywhere near a Microcenter?  My local one has plenty in stock, but you can only buy them in store.  Looks like they will also ship some of the bundles.
 
2020-10-26 4:47:01 PM  
Too bad they couldn't put it in a case with sides all of equal length... then you'd have Pi "r" squared.

You're welcome.
 
2020-10-26 5:02:47 PM  
They could almost run Crysis in EMACs on that thing and maybe still have room to install VI for an editor.
 
2020-10-26 5:08:23 PM  

elaw: Too bad they couldn't put it in a case with sides all of equal length... then you'd have Pi "r" squared.

You're welcome.


Too bad they didn't make the case a circle because even an engineer knows Pi r round.
 
2020-10-26 7:08:12 PM  
I'm barely good enough for simple Pi projects, no way I'm going to make it to a cluster.
 
2020-10-26 8:01:36 PM  
I pay for half a rack at a local datacenter. I don't use the top 1U that's technically mine, and there's a Pi3 sitting on top of my systems that has a full customer badge on it, plus three 2.5" HDDs. I'm dying to know what that thing is doing. Somebody is paying $75/month to keep a sluggish phone-worth of web server on a 1Gbps connection. It's my favorite mystery.
 
2020-10-26 10:02:01 PM  
That's an awful fancy setup he's got there.  The Pi's got 4 mounting holes... whatever happen to just stacking with standoffs?
 
2020-10-26 10:03:08 PM  

vrax: I'd be happy to get just one Raspberry Pi 4 right now.  Really want to play with one.


They're in stock at Amazon and elsewhere.

You need me to buy one for you?
 
2020-10-26 11:15:04 PM  

SansNeural: That's an awful fancy setup he's got there.  The Pi's got 4 mounting holes... whatever happen to just stacking with standoffs?


I mean 4 is an array, but I have to admit to being disappointed that is only 4. I can make an array of 4 of them and engineer a way to hold them. I was hoping for like 64 of them in a cluster.
 
2020-10-27 2:51:34 AM  

SansNeural: That's an awful fancy setup he's got there.  The Pi's got 4 mounting holes... whatever happen to just stacking with standoffs?


The RPis tend to short out taking out all the USB and ethernet ports when it does.
 
2020-10-27 1:56:52 PM  

DON.MAC: SansNeural: That's an awful fancy setup he's got there.  The Pi's got 4 mounting holes... whatever happen to just stacking with standoffs?

The RPis tend to short out taking out all the USB and ethernet ports when it does.


You sure?

Only if they didn't set proper keep out zones around the mount holes when routing the PCB. (checks...)  Nope, looks fine.  Must be user error -  standoffs that are too short.
 
2020-10-27 8:04:18 PM  

SansNeural: DON.MAC: SansNeural: That's an awful fancy setup he's got there.  The Pi's got 4 mounting holes... whatever happen to just stacking with standoffs?

The RPis tend to short out taking out all the USB and ethernet ports when it does.

You sure?

Only if they didn't set proper keep out zones around the mount holes when routing the PCB. (checks...)  Nope, looks fine.  Must be user error -  standoffs that are too short.


They also make insulating plastic standoffs of various lengths. The main problem I see is getting passive airflow around the heatsinks. I haven't played with RPI 4's yet, but I've found you need heatsinks on the SOC and wireless module on 3's.
 
2020-10-27 9:20:42 PM  

SansNeural: You sure?

Only if they didn't set proper keep out zones around the mount holes when routing the PCB. (checks...)  Nope, looks fine.  Must be user error -  standoffs that are too short.


It isn't the standoffs causing the shorting.  Boards that aren't protected top and bottom often end up getting shorted which kills the USB power limiting switch.  There is a jumper hack to get it back working again but I don't know how many dead boards I've seen because of it.  I've got two in my box of stuff to fix the next time I bring out the soldering iron and I know the lab at work has fixed a few.  All that work to save a few cheap plastic cases...
 
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