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by solanum
Sun Apr 01, 2018 5:13 am
Forum: Advanced users
Topic: Current best way to use iSCSI as root disk in 2018?
Replies: 2
Views: 1320

Re: Current best way to use iSCSI as root disk in 2018?

If you set up pxe it ends up to be a lot like this: https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/net_tutorial.md Most low level developers use this method because it is -easy-. You screw up, and it doesn't boot, no biggie switch kernels, or whatever on the network and reb...
by solanum
Sat Mar 31, 2018 5:34 pm
Forum: Advanced users
Topic: New RT (Real Time) kernel branch
Replies: 40
Views: 11594

Re: New RT (Real Time) kernel branch

On the RPI B, it initially hung on usb otg line. I got it to boot by adding to my cmdline.txt the following:
dwc_otg.fiq_fsm_enable=0 dwc_otg.fiq_enable=0 dwc_otg.nak_holdoff=0

I should add that is with kernel 4.14.27-rt21+ and the default config.
by solanum
Sun Mar 05, 2017 1:29 am
Forum: Automation, sensing and robotics
Topic: PWM High Power LED Dimmer - Help!
Replies: 13
Views: 14744

Re: PWM High Power LED Dimmer - Help!

The chinese knockoff the the Adafruit 16channel i2c pwm module is like 3-4 USD, and they are stackable. It is hard to imagine wanting to use a software solution.
by solanum
Sat Mar 04, 2017 7:59 pm
Forum: Raspbian
Topic: Raspbian Package Contribution
Replies: 12
Views: 1925

Re: Raspbian Package Contribution

Valgrind is a lot older then circa 2014. Memcheck is Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al. Valgrind is Copyright (C) 2000-2011, and GNU GPL'd, by Julian Seward et al. LibVEX is Copyright (C) 2004-2011, and GNU GPL'd, by OpenWorks LLP et al. --- I am also getting this error ...
by solanum
Tue Dec 27, 2016 12:07 am
Forum: Other projects
Topic: Hacking the Code-a-pillar?
Replies: 21
Views: 14500

Re: Hacking the Code-a-pillar?

Franck, What part of the sequencing is that? I would expect it query looking for the last module. ie if something isn't connected to the last position, then the modules responds with a direction signal, then turns itself off (until it receives a clear bus signal) so the 2nd to last one doesn't know ...
by solanum
Mon Dec 26, 2016 11:47 pm
Forum: Other projects
Topic: Hacking the Code-a-pillar?
Replies: 21
Views: 14500

Re: Hacking the Code-a-pillar?

I think that is the reaction when it does when it can't move. So I would check to make sure it doesn't work on like a wood floor or berber carpet.
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by solanum
Tue Jun 02, 2015 3:50 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C clock stretching
Replies: 67
Views: 62486

Re: I2C clock stretching

@Gert, since you are the hardware guy. How do we get more detailed specs? Is there a process? Is this the standard ARM implementation of i2c? If so, which version? There is a possibility this isn't a hardware bug, or if it is a hardware bug, potentially it can be worked around in software. But just ...
by solanum
Tue Feb 24, 2015 4:56 am
Forum: Troubleshooting
Topic: Unable to upload sketches to arduino
Replies: 2
Views: 810

Re: Unable to upload sketches to arduino

You need to add yourself to the dialout group if it is greyed out. It is a permissions issue. ie

sudo gpasswd -a <yourusername> dialout

This may not be the only group you need but chances are it is a permissions issue and your user is not in the right group.
by solanum
Fri Jul 12, 2013 6:28 pm
Forum: General discussion
Topic: Raspberry Pi as a lambda sensor controller / display
Replies: 10
Views: 10606

Re: Raspberry Pi as a lambda sensor controller / display

The bosch 4.9 is a better sensor. I'm actually interested in knowing if anyone got this working, yet. I am just looking for a gauge/logger right now, or if anyone can get the lamba/afr values read.
by solanum
Fri Feb 17, 2012 3:34 pm
Forum: General discussion
Topic: educational/distribution./ordering/...
Replies: 6
Views: 1024

Re: educational/distribution./ordering/...

<t>someone else has thought of this already or it is irrelevent and you can delete this thread..<br/> <br/> Can this be bundled with a "book"? The issue -i- see, is that scholarships in the US and I assume everywhere else cover books and supplies but they don't cover computers. Also K12 edu in the U...
by solanum
Sun Nov 06, 2011 6:20 pm
Forum: Staffroom, classroom and projects
Topic: Classroom Setup
Replies: 64
Views: 11197

Re: Classroom Setup

<t>Quote from Skygod on November 6, 2011, 02:22<br/> <br/> If the kids can be taught more planning, then the existing processes may become more efficient and thereby generate extra income, but money per se is not a driving force for most of the community.<br/> <br/> Computers are mainly used by farm...
by solanum
Sun Nov 06, 2011 4:34 pm
Forum: Staffroom, classroom and projects
Topic: Classroom Setup
Replies: 64
Views: 11197

Re: Classroom Setup

<r>Quote from liz on November 3, 2011, 22:40<br/> This sort of bureaucratic stuff is why we've been suggesting that interested teachers and parents might like to look at after-school clubs as a way to reach the kids who may be interested in this sort of thing. We agree; it's a massive hurdle, and we...
by solanum
Thu Nov 03, 2011 10:31 pm
Forum: Staffroom, classroom and projects
Topic: Classroom Setup
Replies: 64
Views: 11197

Re: Classroom Setup

<t>For computer lab or workstation purposes, most people (in the states) have to deal with the bureaucracy and existing infrastructures and educational applications. Without a myriad of already being used applications. One of the best bets is to set it up to netboot, and launch into linux or windows...

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