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by Graymalk
Fri Sep 23, 2016 11:34 pm
Forum: General discussion
Topic: Have experience with Raspberry Pi? Interested in IoT?
Replies: 23
Views: 4737

Re: Have experience with Raspberry Pi? Interested in IoT?

Hi, I don't mind participating, but I have mostly only used my Pis for standard IT things, not IoT. I use small microcontrollers for IoT. I have used my Pis for:
- basic camera box
- web server*
- handy dandy development platform*
- cluster*

*still in use
by Graymalk
Thu Sep 22, 2016 2:30 am
Forum: General discussion
Topic: What is Kaiten? Virus?
Replies: 7
Views: 1650

Re: What is Kaiten? Virus?

Heh, I've always wondered what would get installed on my web serving Pi if I ever let the constant onslaught of daily attacks succeed.
by Graymalk
Wed Sep 14, 2016 2:15 am
Forum: General discussion
Topic: Why use a resistor across IO pins?
Replies: 4
Views: 758

Re: Why use a resistor across IO pins?

I honestly think a lot of people just don't know there's a built-in resistor.
by Graymalk
Wed Sep 14, 2016 2:01 am
Forum: General discussion
Topic: SSH Auto-login/Without Password
Replies: 11
Views: 2808

Re: SSH Auto-login/Without Password

But I should add that I control all the devices that log in. If I had multiple human users then they would have to create their own key pair. And good luck to them since I turned password auth off. ;-)
by Graymalk
Wed Sep 14, 2016 1:58 am
Forum: General discussion
Topic: SSH Auto-login/Without Password
Replies: 11
Views: 2808

Re: SSH Auto-login/Without Password

I solved a similar problem by copying the private key to all the devices that needed to log in.
by Graymalk
Fri Jun 10, 2016 2:51 am
Forum: General discussion
Topic: Voltage limits
Replies: 5
Views: 637

Re: Voltage limits

I can't seem to quote. :-(

Yes, your DAC will be affected as the voltage drops if you are running off unregulated battery. Make sure it is running off regulated power and that it has a really good quality voltage reference ( not sure if the Pi has one - you may have to buy one).
by Graymalk
Tue Jun 07, 2016 2:24 pm
Forum: General discussion
Topic: how to comunicate with pi on 2 different networks
Replies: 6
Views: 1125

Re: how to comunicate with pi on 2 different networks

I basically have the setup you seem to want, and I did it with VLANs and a nice Cisco router with built in switch. You can configure Ciscos to allow traffic across vlans if you want. Or you can port forward between them to keep some stronger separation. I don't work for them though so I strongly sug...
by Graymalk
Thu May 26, 2016 2:18 am
Forum: General discussion
Topic: Isolating Public server on local network
Replies: 8
Views: 1994

Re: Isolating Public server on local network

I accomplish this via my router. I port forward ssh, http, and https to the front facing Pi. The rest have nothing forwarded to them.
by Graymalk
Wed May 25, 2016 9:53 pm
Forum: General discussion
Topic: apt-get update fails after upgrade
Replies: 6
Views: 1577

Re: apt-get update fails after upgrade

Did you try apt-get clean? There is at least one other trick but I forget how it works. I had to use it once on a PC running Ubuntu after an oopsie power loss while it was updating. I'm sure it will come up via google or something. IIRC it's a three fingered salute approach that deletes the whole ap...
by Graymalk
Sun May 22, 2016 12:43 pm
Forum: General discussion
Topic: Hot SD cards
Replies: 36
Views: 20768

Re: Hot SD card raspberry Pi 3

Different philosphy. One of the beauties of the Pi is that, by merely swapping the Sd card, you can have a pristine machine - all your past mistakes have gone. If there were on-board storage, you could never be sure that yesterday's errors won't come back to haunt you. That would be great in a perf...
by Graymalk
Sun May 22, 2016 12:37 pm
Forum: General discussion
Topic: Power bank for pi 3 ?
Replies: 7
Views: 2605

Re: Power bank for pi 3 ?

The question should be whether your Pi is safe for that thing you want to buy, not the other way around. How much power your Pi will need will depend entirely on how you use it and what you have plugged into it. That 2.5A is a maximum suggested to keep the supply safe. Read this: https://www.raspber...
by Graymalk
Sat May 21, 2016 5:06 pm
Forum: General discussion
Topic: Hot SD cards
Replies: 36
Views: 20768

Re: Hot SD card raspberry Pi 3

I have had several do this, but mostly USB sticks. All of my USB 3.0 sticks have done this in various machines. They stop working afterwards. Really annoying. I've stopped buying them. I just use the cloud now. I've been having good luck with Transcend Ultra 600x devices in my Pi's so far. It's hard...
by Graymalk
Thu May 05, 2016 1:46 am
Forum: General discussion
Topic: Provisioning Multiple SD Cards
Replies: 7
Views: 1310

Re: Provisioning Multiple SD Cards

ghans wrote:dd should work on Mac OS.


ghans
It does! It works perfectly.
by Graymalk
Thu May 05, 2016 12:54 am
Forum: General discussion
Topic: Performance difference between RPi3 Made in UK and PRC
Replies: 2
Views: 1340

Re: Performance difference between RPi3 Made in UK and PRC

I own Pis from both sources. The only time there is a performance difference is when the SD cards differ. The cheap ones can perform quite poorly. I've been replacing them as a result.
by Graymalk
Sun Apr 17, 2016 12:19 am
Forum: General discussion
Topic: Worth it?
Replies: 19
Views: 4348

Re: Worth it?

Q: Should I buy a Pi or not?
A: Projects in mind = you keep buying Pi's and rescuing them from others. No projects = you become a source of Pi's that need rescuing. ;-)

In my experience, it's really that simple.
by Graymalk
Sat Apr 16, 2016 4:21 am
Forum: Advanced users
Topic: USB sticks dying
Replies: 1
Views: 479

Re: USB sticks dying

I haven't been able to keep a USB 3.0 stick alive. Drives me nuts. I'm not buying them anymore.
by Graymalk
Wed Mar 23, 2016 4:10 am
Forum: Raspbian
Topic: having trouble contacting mirrors
Replies: 4
Views: 895

Re: having trouble contacting mirrors

Well then. I fixed it by changing mirrors. Except I had to go pretty far down the list of Raspbian mirrors before I found one that worked, which is a little surprising.
by Graymalk
Wed Mar 23, 2016 3:43 am
Forum: Raspbian
Topic: having trouble contacting mirrors
Replies: 4
Views: 895

having trouble contacting mirrors

I've been trying to install some software via apt-get and it chokes when it tries to contact mirrordirector.raspbian.org/ . On one Pi (a Pi B), it just eventually gives up and errors out. On another (Pi 2B), it waits a super long time but eventually installs. I've done apt-get clean several times. I...
by Graymalk
Tue Jan 26, 2016 2:06 am
Forum: Troubleshooting
Topic: jessie won't boot when fstab entries not found
Replies: 20
Views: 51858

Re: jessie won't boot when fstab entries not found

Just ran into this today. Googled, found this thread and no solutions elsewhere. Decided to try the steps here: http://www.raspberrypi-spy.co.uk/2014/08/how-to-reset-a-forgotten-raspberry-pi-password/ It works. Just skip the password reset part. You can just edit the fstab file directly (normal shel...
by Graymalk
Tue Dec 15, 2015 2:50 am
Forum: Beginners
Topic: Parallelism
Replies: 10
Views: 1662

Re: Parallelism

seriously if you want to play with parallelism then http://www.parallella.org/ http://uk.rs-online.com/web/c/semiconductors/semiconductor-development-kits/processor-microcontroller-development-kits/ is what you want to play with raspberry pi's are not suited for this task - you can however start wi...
by Graymalk
Sun Dec 13, 2015 10:00 pm
Forum: Beginners
Topic: Parallelism
Replies: 10
Views: 1662

Re: Parallelism

Also I've been wondering if we can use the GPU in these Pis.
by Graymalk
Sun Dec 13, 2015 9:32 pm
Forum: Beginners
Topic: Parallelism
Replies: 10
Views: 1662

Re: Parallelism

I am strongly in favour of multi-core setups. Although they have to share memory, bus, and comms, they still benefit in being able to at least put the operating system on its own core. In my analyses so far, I have noticed, basically, that if you try to oversubscribe a single core (i.e. run more tha...
by Graymalk
Sun Dec 13, 2015 6:27 pm
Forum: Beginners
Topic: Parallelism
Replies: 10
Views: 1662

Re: Parallelism

Oh goodie! Someone else who is making a cluster! I've been slowly working on one, too, and I keep wanting to post about it but I keep not having much opportunity. :lol: OK, my thoughts on your questions: I was hoping to gain a couple of the rpi zero's but they flew off the shelf before I could get m...
by Graymalk
Thu Nov 12, 2015 6:26 am
Forum: Advanced users
Topic: MPI on Raspberry Pi - problem with logging into devices
Replies: 9
Views: 1697

Re: MPI on Raspberry Pi - problem with logging into devices

It is now time to calculate pi on my raspberry pi cluster. :lol: :lol: :lol:
by Graymalk
Thu Nov 12, 2015 6:23 am
Forum: Advanced users
Topic: MPI on Raspberry Pi - problem with logging into devices
Replies: 9
Views: 1697

Re: MPI on Raspberry Pi - problem with logging into devices

Provided I run these two lines each and every time I log in: exec ssh-agent bash ssh-add $HOME/.ssh/<private key file> And then run MPI after that, it works, provably. I prove it to myself thusly: mpirun -nooversubscribe -n 2 -H <the two raspberry pi addresses here> <program linked below> Sample pro...

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