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by aoakley
Wed Sep 30, 2015 10:10 am
Forum: Raspbian
Topic: New install of Jessie but keeping home/pi directory?
Replies: 1
Views: 701

New install of Jessie but keeping home/pi directory?

Hi folks. Like many people I'm really excited about the new Jessie upgrade of Raspbian, espeically, for me, sudo-less GPIO which will make my Cotswold Raspberry Jam coding tutorials much easier. My plan is to do a clean install and then copy across the pi user's home directory. I'll remember to copy...
by aoakley
Wed Sep 30, 2015 10:00 am
Forum: Raspbian
Topic: STICKY: How to upgrade a Wheezy image to Jessie (both defunct and replaced versions of Raspbian)
Replies: 88
Views: 219949

Re: How to upgrade a Wheezy image to Jessie

I notice that the upgrade goes quite quickly until it gets to the place where it starts getting jessie/main wolfram-engine wolfram-engine was over 400MB last time I checked. It's going slow because that file is very big to download. There is no way to speed this up unless you can take your Pi to an...
by aoakley
Wed Sep 16, 2015 2:00 pm
Forum: Python
Topic: GPIO resistors in output ?
Replies: 3
Views: 1259

Re: GPIO resistors in output ?

rpdom wrote:I'm not sure what use a 220K Ohm resistor would be anywhere in an LED circuit
Well spotted. I did, of course, mean 220 Ohm. Thanks for the responses, everyone.
by aoakley
Mon Sep 14, 2015 4:27 pm
Forum: Python
Topic: GPIO resistors in output ?
Replies: 3
Views: 1259

GPIO resistors in output ?

On the Raspberry Pi, you can enable onboard pull-up or pull-down resistors for GPIO ***INPUT*** pins in code, for example: GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) Is it possible to use these internal resistors for ***OUTPUTS*** to provide sufficient resistance not to burn out a bog stan...
by aoakley
Fri Apr 24, 2015 8:53 am
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Since clocking down from 1000MHz to 700MHz, the Pi 2 has remained rock-solid stable.

I'll try a clock of 900MHz using the raspi-config tool.
by aoakley
Fri Apr 17, 2015 10:54 am
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Looking through: https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=103847#p717845 ...I am now considering whether this might be due to overclock. On checking /boot/config.txt, I realise I had the overclock set to the rpi-config 1000MHz settings. I have now dropped this to 700MHz and will see i...
by aoakley
Thu Apr 16, 2015 3:31 pm
Forum: Troubleshooting
Topic: How to perform RAM memory test check please?
Replies: 3
Views: 4481

Re: How to perform RAM memory test check please?

Thanks. Looking at that thread I'm also now wondering whether the "default" overclock of 900MHz might be at fault. I have now clocked mine back to the 700Mhz default and have set cron to run memtester overnight 700MB x 10. If that passes then I'll gradually work my way up the rpi-config overlocks ov...
by aoakley
Thu Apr 16, 2015 11:18 am
Forum: Troubleshooting
Topic: How to perform RAM memory test check please?
Replies: 3
Views: 4481

How to perform RAM memory test check please?

As per: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=104212 ...I'm having repeated freeze/crash problems with my Raspberry Pi 2. Having changed PSU to the official one, changed micro SD card, updated etc. I am now wondering whether my machine might have faulty RAM. How can I perform a RAM...
by aoakley
Thu Apr 16, 2015 11:13 am
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

And again: http://aoakley.com/misc/rpi-fault-20150412-full.jpg ----Sun Apr 12 22:35:01 BST 2015---- top - 22:35:01 up 7 days, 1:06, 4 users, load average: 0.10, 0.21, 0.30 Tasks: 121 total, 1 running, 120 sleeping, 0 stopped, 0 zombie %Cpu(s): 3.8 us, 0.2 sy, 0.0 ni, 96.0 id, 0.0 wa, 0.0 hi, 0.0 si,...
by aoakley
Mon Apr 13, 2015 12:46 pm
Forum: Troubleshooting
Topic: RPi 2 Model B Locking Up
Replies: 37
Views: 15016

Re: RPi 2 Model B Locking Up

Similar issue being tracked here, with screenshots and logs:

viewtopic.php?f=28&t=104212&p=736842
by aoakley
Mon Apr 13, 2015 12:35 pm
Forum: Troubleshooting
Topic: RPi freezes in about a week. Please HELP
Replies: 26
Views: 7661

Re: RPi freezes in about a week. Please HELP

I am tracking a similar problem here, only on a Pi 2:

viewtopic.php?f=28&t=104212&p=736842#p736842

There are logs and screenshots on that thread.
by aoakley
Thu Apr 09, 2015 11:22 am
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Sadly, the problem came back, even using the official branded Raspberry Pi Foundation power supply. So it's not the power supply, then. The machine froze just after 08:25BST on Fri 3 April. Here's the console screenshot: http://aoakley.com/misc/rpi-fault-20150405-full.jpg I don't know what to make o...
by aoakley
Thu Mar 26, 2015 4:08 pm
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Just to follow up, after a week of using the approved Foundation 2A PSU, the machine has been running 24/7 with no recurrence of the problem. With the old 1.2A unofficial PSU, its best uptime was 4 days. I am therefore putting this down to the RPi 2 being a lot more fussy about power supply , despit...
by aoakley
Fri Mar 20, 2015 10:24 am
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Sadly when I inspected the HDMI output of my most recent freeze, the display was blank, which suggests to me either a power problem, or an unscheduled/accidental shutdown (did I do shutdown -h now - halt - instead of shutdown -r now - reboot - after a kernel upgrade perhaps? Pretty sure I'd remember...
by aoakley
Wed Mar 18, 2015 12:54 pm
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Screen is running elinks and several SSH clients for me.

I could run a cron job to log free -m and top -bn 1 every 5 mins I suppose.
by aoakley
Wed Mar 18, 2015 12:03 pm
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

Awful cameraphone screenshot of previous freeze: http://aoakley.com/misc/rpi-fault-20150309-full.png Unhandled fault: alignment exception (0x001) at 0x73692065 Unable to handle kernel paging request at virtual address e3e00004 ... Process: screen (pid: 21891, stack limit = 0xb32a0238) ... note: scre...
by aoakley
Wed Mar 18, 2015 10:55 am
Forum: Troubleshooting
Topic: pi2 dead unexpectly
Replies: 31
Views: 8593

Re: pi2 dead unexpectly

I am seeing very similar behaviour. RPI2 acting as a server/text-only console. Constantly running with SSH, Lighttpd, ShellInABox, SMB mount to NAS, elinks ncurses browser and GNU Screen. The GNU screen session runs 24/7 as I use this as my go-to common terminal from a variety of locations. Running ...
by aoakley
Mon Mar 09, 2015 7:42 pm
Forum: Troubleshooting
Topic: RPi 2: Unhandled fault: Alignment exception
Replies: 1
Views: 918

RPi 2: Unhandled fault: Alignment exception

My Raspberry Pi 2 running Raspbian (last updated last week) froze today with the attached error screen (larger version at http://aoakley.com/misc/rpi-fault-20150309-full.png ). Please forgive the poor smartphone-camera-pointed-at-display quality. rpi-fault-20150309-800.png A similar problem happened...
by aoakley
Fri Feb 27, 2015 1:57 am
Forum: General discussion
Topic: RPi Birthday Party 28 Feb - 1 March
Replies: 7
Views: 1744

Re: RPi Birthday Party 28 Feb - 1 March

My completed GPIO LED & photoresistor Birthday Candles can now be seen at:

http://youtu.be/t2kleiERhC8
by aoakley
Thu Feb 12, 2015 11:53 am
Forum: Troubleshooting
Topic: Problem with micro SD cards
Replies: 7
Views: 925

Re: Problem with micro SD cards

Shrink the partition on the image. You'll need to have at least one SD card that you *can* successfully write to. Take this successful SD card and use GParted to shrink/resize the partition. If you have a spare Intel-architecture PC, you can run the GParted Live CD to resize it. http://gparted.sourc...
by aoakley
Thu Feb 12, 2015 11:27 am
Forum: Troubleshooting
Topic: Recent apt-get upgrade is scary if user != pi (pifacecommon)
Replies: 1
Views: 604

Recent apt-get upgrade is scary if user != pi (pifacecommon)

Hi folks. An apt-get dist-upgrade this morning (12 Feb 2015) showed a few scary bits. This is from a Raspberry Pi 2 using the 2015-01-31 Raspbian image. ... Setting up python-pifacecommon (4.1.2-1) ... Creating group 'spi' groupadd: group 'spi' already exists gpasswd: user 'pi' does not exist User "...
by aoakley
Mon Feb 09, 2015 2:59 pm
Forum: General discussion
Topic: Kapton tape on HDMI port?
Replies: 4
Views: 1603

Re: Kapton tape on HDMI port?

At the risk of reactivating a very old thread, my two Raspberry Pi 2s that arrived from RS Components last week, had more "solid" HDMI ports with fewer cutaways, and did not come with Kapton tape. However there are various photos of B2s that *do* have Kapton tape. My 5-year-old daughter considered t...
by aoakley
Mon Feb 09, 2015 2:51 pm
Forum: Troubleshooting
Topic: Why is the PI2 camera-shy ?
Replies: 162
Views: 264172

Re: Why is the PI2 camera-shy ?

So, in short: small lump of wall tack or snippet of black electrical insulating tape over the offending chip, identified in mikerrr's photo, and we're done, right? https://pbs.twimg.com/media/B9Ut_QwIQAACrp_.jpg My experiment for when I get home, is to discover whether using Kapton tape, pulled from...
by aoakley
Thu Jan 15, 2015 12:28 pm
Forum: General discussion
Topic: RPi Birthday Party 28 Feb - 1 March
Replies: 7
Views: 1744

RPi Birthday Party 28 Feb - 1 March

Okay, my tickets are booked for my eldest daughter (Annabel, 8) and myself, for the Saturday including the party. Have also put myself down for a show & tell. We are coming from Tewkesbury, Gloucestershire. Who else is coming and what are your plans? Our planned show & tell is a Raspberry Pi "birthd...
by aoakley
Tue Oct 21, 2014 9:40 pm
Forum: User groups and events
Topic: Raspberry Jam in Gloucestershire / Cheltenham / Gloucester
Replies: 6
Views: 1717

Re: Raspberry Jam in Gloucestershire / Cheltenham / Gloucest

Now fully live, date is Sat 22 Nov 1-4pm, free tickets now available.

More details on Andy's new thread:
http://www.raspberrypi.org/forums/viewt ... 09#p629309

or our website http://www.cotswoldjam.org

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