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by Bigwol
Fri Jun 08, 2012 7:45 pm
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

Connected everything up - including the powered USB hub with attached Keyboard and Mouse, it fired up first time with no problems and a board voltage at tp1 and tp2 measured at 4.85V. logged in to debian, started the gui - all OK, Next question - would it work without the USB hub? Shut it down, disc...
by Bigwol
Fri Jun 08, 2012 3:00 pm
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

I got a bargain from Curry's today, they were selling off 'Old Stock' and I got a brand new Belkin 4 port USB 2.0 powered hub complete with 5V 2.6A power supply and USB A to mini usb cable for the astonishing price of £2.97 including VAT. http://img.photobucket.com/albums/v470/DaveWallisPics/belkin7...
by Bigwol
Fri Jun 08, 2012 8:19 am
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

I got my replacement Pi from RS - despite the 14 day turnround promised on the official RS returns form this took over a month. I Posted it to Corby by recorded delivery on 5th May, tracking confirmed that RS got it on 6th May, I received the replacement yesterday after many phone calls and gentle r...
by Bigwol
Wed May 30, 2012 12:24 am
Forum: General discussion
Topic: 24 hours on
Replies: 6
Views: 2457

Re: 24 hours on

rurwin

Thanks for that,

My pi's in RS hospital, having shown few signs of life on arrival, but your quest py prog was fun, and brought back Commodore PET / Sirius 1 (Pre IBM PC) memories from the dim and distant!

More power to your elbow

Cheers

Dave
by Bigwol
Mon May 21, 2012 12:27 am
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

This is a pic from my dead Pi - it confirms the F3 value - Mine's gone back to RS

Image
by Bigwol
Thu May 17, 2012 6:50 pm
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

Mine wouldn't even boot without a keyboard, which is why it's gone back to RS. Some of the other technical discussions elsewhere, and the measured resistance (7.5R) of the current limiting polyfuse fitted to my Raspberry pi's USB input, go some way to explaining why nothing worked, and I'm looking f...
by Bigwol
Wed May 16, 2012 12:56 am
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

Having had the voltage drop blamed on the cheap USB cable before the finger of blame started pointing towards other sources of high resistance, and since I needed to dismember a cheap USB cable for another project, I thought I'd measure the resistance of an 80p no-name Amazon USB 2.0 cable and see w...
by Bigwol
Tue May 15, 2012 9:08 am
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

My fuses measure a little differently F1 = 7.5 Ohms F2 = 5.0 Ohms F3 = 0.5 Ohms Those values seem high; if you draw 100 mA from the upper USB port (F1) you'd see a 0.75 V drop over the probably already-slightly-low "+5V" bus on the board, putting it outside the USB spec, and that's assuming F1 is s...
by Bigwol
Mon May 14, 2012 8:00 pm
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 125882

Re: Design flaw? Polyfuses for USB current limiting

My fuses measure a little differently

F1 = 7.5 Ohms
F2 = 5.0 Ohms
F3 = 0.5 Ohms
by Bigwol
Mon May 14, 2012 2:51 pm
Forum: Troubleshooting
Topic: Recommended USB power supplies?
Replies: 12
Views: 21321

Re: Recommended USB power supplies?

Excellent value and recommended - Nokia 5V 1200mA - £3.99 delivered from Amazon - rock solid 4.9V at test points

http://www.amazon.co.uk/gp/product/B007W3F6CA
by Bigwol
Mon May 14, 2012 1:12 pm
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

Over the weekend my new power supply arrived - Excellent value and recommended - Nokia 5V 1200mA - £3.99 delivered from Amazon http://www.amazon.co.uk/gp/product/B007W3F6CA My final SD Card purchase for now also arrived (Class 6 Transcend 8Gb). I therefore put it all together with the existing appro...
by Bigwol
Sun May 13, 2012 5:38 pm
Forum: Beginners
Topic: Pictures all squished
Replies: 0
Views: 768

Pictures all squished

The new forum layout looks great, apart from the pictures from existing posts, which appear to have been stretched to fit the width, and look vertically squashed, as if sat upon by a mammoth.
by Bigwol
Fri May 11, 2012 9:45 pm
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

Photos inside the SD Card Connector without a card in as requested







by Bigwol
Fri May 11, 2012 4:23 pm
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

<t>You're right about the barrel distortion, the SD card doesn't get bent, just the lugs on the outside of the card holder, the sprung contacts all look OK and seem to be operating OK, though I haven't tried excercising them individually - I'll try that when I get home after photographing them using...
by Bigwol
Fri May 11, 2012 1:13 am
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

<t>I bought a new SD Card this evening, having become paranoid about my allegedly compliant, but clearly non-functional SanDisk Class 2 2Gb and 8Gb cards.<br/> <br/> <br/> <br/> I formatted the new SD Card as advised in the Wiki using SDFormatter 3.1, which worked fine<br/> <br/> <br/> <br/> And the...
by Bigwol
Thu May 10, 2012 11:49 am
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

<t>The screenshot with the SD card error is from the 2Gb card -<br/> <br/> it states the capacity as 1.84 GiB on the screenshot,<br/> <br/> The 8Gb card doesn't give an SD card error and states the capacity as 7. something or other GiB, but still gives the Kernel panic error.<br/> <br/> I've now tri...
by Bigwol
Thu May 10, 2012 10:26 am
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

<t>Nope -<br/> <br/> Used an 8Gb Sandisk SD Card (15Mb / s)<br/> <br/> The image transferred fine to the card as with both the 2Gb cards (neither of which were microSD cards - they were both full size and both on the 'Good Cards' list in the wiki.<br/> <br/> I got the same error - Kernel panic - not...
by Bigwol
Wed May 09, 2012 9:15 pm
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

<t>Tried adjusting voltage on the supply so the voltage at the test point was 5.00V<br/> <br/> Also removed USB devices and rewrote a fresh debian image onto the SD Card.<br/> <br/> This made no difference - ir started up, got 30 lines in and stopped with the same Kernel panic - not syncing message ...
by Bigwol
Wed May 09, 2012 3:44 pm
Forum: Troubleshooting
Topic: Kernel panic - not syncing: Attempted to kill init!
Replies: 27
Views: 57243

Re: Kernel panic - not syncing: Attempted to kill init!

<t>My pi arrived today, and I get a problem on Boot<br/> <br/> I've used two different SD Cards, and the Debian and ArchLinux images including the one from the sig in Troubleshooting.  I checked the voltage between TP1 and TP2 which is 4.75V<br/> <br/> Thinking this was on the bottom end of the decl...
by Bigwol
Mon Mar 12, 2012 12:32 pm
Forum: General discussion
Topic: New logo?
Replies: 49
Views: 10437

Re: New logo?

I was going to start a new thread before searching for logo colour comments just in case there was one already, and found that I'm clearly not the only one who thinks that the logo is turning into a strawberry!

The original raspberry colour was much nicer.
by Bigwol
Fri Feb 24, 2012 1:10 pm
Forum: Off topic discussion
Topic: Woohoo!! It's Thursday in China!!!
Replies: 28
Views: 4225

Re: Woohoo!! It's Thursday in China!!!

wot! no Pi?

p.s. Sums before posting is too hard!!
by Bigwol
Thu Feb 09, 2012 12:56 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3764
Views: 240686

Re: Introduce yourself!

<t>Hi<br/> <br/> I'm Dave, and I work in software, my interests include photography I was considering looking at the Arduino for flash photography controlled by external triggers, but heard about the RaspberryPi project, and figured that it would be worth supporting a UK based (though chinese manufa...

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