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by conundrum
Sun Dec 22, 2013 10:49 am
Forum: General discussion
Topic: SD slot broken
Replies: 16
Views: 14606

Re: SD slot broken

Hi, ran into a similar problem when trying my modified "sawn off SD" originally intended to use an rsMMC but this doesen't work. Luckily managed to fix it, the retaining pin inside the slot was just loose. Gently squeezed the slot near the pin and this fixed it fine. Re. guys with stuffed Pi's, feel...
by conundrum
Sun Feb 24, 2013 3:06 pm
Forum: Troubleshooting
Topic: Raspberry Pi doesn't stay powered up for long.
Replies: 254
Views: 64106

Re: Raspberry Pi doesn't stay powered up for long.

Sounds a bit like the problem I have with my Model B, where the 220uF capacitor has come loose. Best bet is to get a magnifying lens or scanner lens and look at the connections, if both are shiny all OK. If one looks like it is dull and crystalline or there is obvious detachment around the capacitor...
by conundrum
Sun Feb 24, 2013 2:58 pm
Forum: Troubleshooting
Topic: Broken capacitor 220uF
Replies: 2
Views: 438

Broken capacitor 220uF

Hi all. Looks like the "broken connector" fault on my Model B was in fact the capacitor. Noticed it seemed to be wobbling, upon examination one solder joint near the edge is cracked. It looks like the capacitor is detached from the board, is this something I should DIY with solder paste or send it b...
by conundrum
Sun Feb 10, 2013 2:36 pm
Forum: Off topic discussion
Topic: Pi drag racing
Replies: 3
Views: 897

Re: Pi drag racing

Hi, thanks for that 8-)

I wonder if the high speed Duracell cards (x10) 32GB are going to be enough?
Running 'Droid on my Pi might do the trick, might need to search around for a Pi with enough reserve capacity to run at 1GHz+

-A
by conundrum
Sun Feb 10, 2013 2:32 pm
Forum: Wanted
Topic: Used Pi Model B
Replies: 3
Views: 1686

Re: Used Pi Model B

Hi, yes ordering a Model A is likely to be cheaper :mrgreen: Also, does anyone happen to know what the lower limit for SD cards is on these, as in my drawer I found a 1GB eMMC which is not currently in use and otherwise fits in the Pi's port without sticking out at all. Its got the correct number of...
by conundrum
Sun Feb 10, 2013 2:25 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 840
Views: 385148

Re: I made a Raspberry PI Laptop

Hi, now the model A is out I might have a go at using my defunct Panasonic portable DVD as a PiTop (tm) :-) The problem is that despite having video input, FM transmitter, a 9 hour battery and a nice Pi-shaped hole where the defunct DVD mechanism used to fit the height is just a bit too short. :evil...
by conundrum
Sat Feb 09, 2013 11:21 am
Forum: Troubleshooting
Topic: Faulty Raspberries
Replies: 45
Views: 4902

Re: Faulty Raspberries

Hi, duff crystals sounds plausible. I have seen this happen before on another device and sometimes spot heating of the xtal will start it up again; seems that the problem is overheating of the xtal damaging the internal contacts which are similar to the ones found on piezo transformers and speakers....
by conundrum
Sat Feb 09, 2013 10:59 am
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 21471

Re: Model A: How low can you go? (Power consumption)

Hmm, thats worth a try. Maybe use an NCP3064 as that also has an enable pin and comes in a smaller package. I did wonder if adding a power off feature to the Pi and "wake up on x" ie when a USB is plugged in would be handy for the XBMC folks. Also adding something that turns the Pi on if it receives...
by conundrum
Sat Feb 09, 2013 10:47 am
Forum: General discussion
Topic: Cheap webcam good in low light?
Replies: 3
Views: 1794

Re: Cheap webcam good in low light?

I have an old PS2 "EyeToy" here..
Might try it to see if that works.

Re. USB problems, sounds to me like a timing issue.
Have you tried adding line filtering on the power, 2K2s to ground etc?
I found this often helps, at least it did on my stubborn 3G dongle.

-A
#include "OMGWTFRPIBBQ.h"
by conundrum
Sat Feb 09, 2013 10:44 am
Forum: Troubleshooting
Topic: Underpowered USB hard drive through powered USB hub
Replies: 7
Views: 1635

Re: Underpowered USB hard drive through powered USB hub

Had a similar problem here with my external 1TB in a caddy. The connector DOES matter, some cheaper 5 pin cables do not work. I think its the thickness of the wire which is the issue as during current peaks it drops below the motor failsafe voltage of 4.65V I am looking into making an external HDD c...
by conundrum
Sat Feb 09, 2013 10:39 am
Forum: Wanted
Topic: Used Pi Model B
Replies: 3
Views: 1686

Used Pi Model B

Hi all. Does anyone have a Model B with cosmetic problems which still works? ie soldered to, unstable, connector damage etc but still boots. If so I am interested as for my project it only has to work in an RC car which is likely not to survive very long due to aggressive cats, stupid drivers etc. T...
by conundrum
Tue Jan 01, 2013 2:39 am
Forum: Troubleshooting
Topic: Overheating problem with new 512MB model
Replies: 32
Views: 11717

Re: Overheating problem with new 512MB model

Hi, having seen this before with defective digiboxes, PC RAM and graphics cards, its almost certainly a microscopic break in one of the BGA pins between the CPU and RAM. I've also noticed that my Pi has glitches on the "rainbow screen" when it first turns on but these go away and don't show up on th...
by conundrum
Sat Oct 13, 2012 8:58 am
Forum: Automation, sensing and robotics
Topic: Getting started with robotics?
Replies: 26
Views: 10543

Re: Getting started with robotics?

Hi, I was planning to build a laser etcher as my first Pi project. The main annoyance is that all of my screens have far too low a resolution for sensible viewing. Mostly broken DVD players running in Vid In mode, and a few others. Has anyone had any luck implementing a user tweakable version of Cle...
by conundrum
Tue Oct 02, 2012 8:53 am
Forum: Other projects
Topic: retro txt display idea
Replies: 4
Views: 1118

Re: retro txt display idea

Its also worth making a shield using some tristate buffers.
That way if there is ever a short to Vel or Vpp it shouldn't blow the GPIO pins.

I have some fairly nice 2*20 displays here, sadly with screen burn.
Any suggestions or is this a terminal situation?

-A
by conundrum
Tue Oct 02, 2012 8:49 am
Forum: Other projects
Topic: Panasonic LS86 display
Replies: 0
Views: 447

Panasonic LS86 display

Hi all. Well I got it working despite having a few glitches with the non standard pinout on the video input. Has anyone got any ideas how to implement cleartype (tm) on such a small screen? It seems that the resolution is fine but the particular mode being used by the Panasonic only works correctly ...
by conundrum
Mon Oct 01, 2012 11:58 am
Forum: Advanced users
Topic: New Overclocking bricked my RasPi
Replies: 21
Views: 7800

Re: New Overclocking bricked my RasPi

Thats an intriguing fault, never heard anything like this apart from on some PIC/AVR open window (UV erase) MCUs where ambient light would fritz around with the memory. I did wonder about the possibility of munged code messing up the EDID data on some flat panels, seems that even though "officially"...
by conundrum
Mon Sep 24, 2012 5:27 am
Forum: Staffroom, classroom and projects
Topic: Donate 100 raspberry pi to a school in need.
Replies: 13
Views: 3328

Re: Donate 100 raspberry pi to a school in need.

Good idea. I was looking into using "thrown out" WEEE bin 15" monitors with a simple add-on board specifically for the Pi as the resolution is more than adequate. Another option is to purchase some small portable DVD type panels and bulk replace the backlight cathodes with LED strips (not many $) so...
by conundrum
Sat Sep 22, 2012 1:52 pm
Forum: Other projects
Topic: Using more than one Pi on one Screen
Replies: 10
Views: 2517

Re: Using more than one Pi on one Screen

If all else fails, there are multiplex VGA to 2*VGA chips available on sample from Maxim. They should work for low bandwidth HDMI, just add a single e2prom to fool the Pi into outputting video all the time. These can be obtained from a broken LCD panel or reprogrammed to support the screen being use...
by conundrum
Sat Sep 22, 2012 1:42 pm
Forum: Other projects
Topic: LVDS Boards for laptop Screen
Replies: 15
Views: 32743

Re: LVDS Boards for laptop Screen

Possible workaround:- Use a very thin PCB with the correct track pitch.
The connector is usually about 1mm inside and should happily accept a small board, as long as you don't force it.
If too thick carefully sand down until it fits.

This idea was contributed by Phil P.

Hope this helps, -A
by conundrum
Sat Sep 22, 2012 1:36 pm
Forum: Other projects
Topic: Stereoscopic 3D possible?
Replies: 7
Views: 3738

Re: Stereoscopic 3D possible?

An idea is to use the existing CVBS output and an LM1881 to generate the frame switch commands and transmit to 3D shutter glasses.

-A
by conundrum
Sat Sep 22, 2012 1:35 pm
Forum: Other projects
Topic: Touch Screen inversion
Replies: 6
Views: 2773

Re: Touch Screen inversion

Inverting the touch screen cable sometimes works, the DSi was prone to this. I did come up with a way to make custom touch screens by harvesting parts from a broken large touch screen, glass cutter, Dremel, silver demister paint and a stencil.. Watch for nasty sharp glass though! -A #include "Howman...
by conundrum
Sat Sep 22, 2012 1:14 pm
Forum: Other projects
Topic: Wearable computer
Replies: 8
Views: 2588

Re: Wearable computer

I have two non working ones here, seems that the flexi connector on the LCD panel set tends to degrade if used a lot so if you have one put a drop of Epoxy on the panel side before going a-tinkering :-) At some point I will make a replacement board which interfaces the PCB with the bare display, so ...
by conundrum
Sat Sep 22, 2012 1:07 pm
Forum: General discussion
Topic: Question about SMD fuses - Not the ones on the Pi
Replies: 4
Views: 2637

Re: Question about SMD fuses - Not the ones on the Pi

EEEEEK! Thats really bad, usually the cause is a damaged high voltage LCD inverter. Sometimes one transistor committs seppuku but sort of half works, drawing >2A but the inverter runs in blocking mode rather than Royer mode. This rarely lasts long, graduating to full on smoke mode in short order. He...
by conundrum
Sat Sep 22, 2012 12:49 pm
Forum: General discussion
Topic: Blueberry Pi?
Replies: 3
Views: 4615

Blueberry Pi?

Hi..
Can the makers of the RPi add Bluetooth and an SDR chipset to the Pi please :-)
Thanks!!!

-A

"Bother!" said Pooh, as the TSA had no sense of humour...
by conundrum
Sat Sep 22, 2012 12:47 pm
Forum: Off topic discussion
Topic: Mooncake's Error
Replies: 16
Views: 2903

Re: Mooncake's Error

Asimov's Fourth Law. "A robot must know it is a robot."

-A

"Bother!" said Pooh, as his keyboard dropped its W key...

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