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by rpdom
Sat Feb 15, 2014 5:58 am
Forum: Troubleshooting
Topic: Pi won't connect to the internet
Replies: 5
Views: 1645

Re: Pi won't connect to the internet

Ok, for some reason your default gateway isn't set. That should have been provided by your DHCP server which is in your router. The output from route -n should have looked something like this: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 ...
by rpdom
Fri Feb 14, 2014 9:11 pm
Forum: Beginners
Topic: raspberry pi or arduino
Replies: 5
Views: 946

Re: raspberry pi or arduino

[quote="Kirk Fraser"]As Douglas6 wrote, the Pi is an embedable personal computer motherboard with input/output pins, which costs more than a low end laptop when you add SD card, monitor, keyboard, mouse, power supply, VGA converter, USB hub, and a Linux compatible wifi fob</quote> Why would you need...
by rpdom
Thu Feb 13, 2014 8:21 pm
Forum: Off topic discussion
Topic: Easy/Hard Programming Tasks
Replies: 18
Views: 2629

Re: Easy/Hard Programming Tasks

But remote technical support when it doesn't work for 1 person in 99 and you can't reproduce the error is VERY hard :) There's some of the description of my day job in there. Try doing it for major customers who can get an entry on the home page of http://bbc.co.uk/news when things go from bad to w...
by rpdom
Thu Feb 13, 2014 6:24 pm
Forum: Automation, sensing and robotics
Topic: 24v to 12v input 12v and 5v outputpower supply circuit
Replies: 10
Views: 3741

Re: 24v to 12v input 12v and 5v outputpower supply circuit

It does take DC input. The "11.1~30v" is a clumsy way of saying the input should be between 11.1V and 30V DC, typically supplied by a battery pack containing 3 to 8 LiPo cells connected Serially (3S-8S).
by rpdom
Thu Feb 13, 2014 4:47 pm
Forum: Troubleshooting
Topic: /etc/apt/sources.list
Replies: 9
Views: 8270

Re: /etc/apt/sources.list

That's just showing the first "hop" of the route. It seems to get as far as your router (192.168.1.1) and then stall.

That does suggest that your ISP is blocking mirrordirector.raspbian.org for some inexplicable reason.
by rpdom
Wed Feb 12, 2014 10:15 pm
Forum: General discussion
Topic: Heat Sinks, Do YOU need them.
Replies: 86
Views: 195292

Re: Heat Sinks, Do YOU need them.

I too have a V1.0 board that has the 1.8V problem. I have a tiny heatsink on the LAN chip to keep it a bit cooler, but that is just because I happened to have one lying around. I doubt it would be a problem without it, even though the chip does run a bit hot. I don't have a heatsink on the SoC/RAM s...
by rpdom
Wed Feb 12, 2014 8:24 pm
Forum: General discussion
Topic: Can't search on site for help!
Replies: 11
Views: 1356

Re: Can't search on site for help!

These forums (fora?) are mostly populated by Raspi owners like me who are keen and will help as much as they can.

The search function is part of the PHPBB software and not so easily changed.
by rpdom
Wed Feb 12, 2014 7:38 pm
Forum: General discussion
Topic: RaspBerry Pi(e) Model C (imaginations & wants)
Replies: 431
Views: 161817

Re: RaspBerry Pi(e) Model C (imaginations & wants)

AFAIK the LAN8512 chip does support WOL, but it is not enabled/connected to anything that will recognise it. It would probably need an additional GPIO line to be tied up and the firmware modified to listen to that GPIO. Not really worth it, considering the small amount of power that the Pi uses when...
by rpdom
Wed Feb 12, 2014 10:05 am
Forum: Raspberry Pi OS
Topic: Swap file/partition
Replies: 11
Views: 8318

Re: Swap file/partition

mcgyver83 wrote:Ok, but I want only to disable it, test the new solution and after remove the package if not need.
Ok, "sudo dphys-swapfile swapoff" will turn it off until the next boot, I believe.
by rpdom
Wed Feb 12, 2014 9:25 am
Forum: Raspberry Pi OS
Topic: Swap file/partition
Replies: 11
Views: 8318

Re: Swap file/partition

Remove the package dphys-swapfile. That will disable the swapfile method. You may need to delete the file manually after rebooting for the first time, I dunno, never tried it.
by rpdom
Wed Feb 12, 2014 8:28 am
Forum: General programming discussion
Topic: Editing Image file
Replies: 1
Views: 636

Re: Editing Image file

Search for "safe mode" or "recovery mode". There are a few ways of doing this, even in NOOBS from what I understand (haven't looked at that yet as my Raspis are running fine without it). As for doing it on a PC... forget windows, it is useless at this sort of thing. Download a Linux live image for C...
by rpdom
Wed Feb 12, 2014 6:23 am
Forum: Troubleshooting
Topic: tvservice -p not working on Dell monitor
Replies: 2
Views: 757

Re: tvservice -p not working on Dell monitor

Have you tried fbset to reset the frame buffer?

Something like:

Code: Select all

sudo tvservice -p
sudo fbset -depth 8
sudo fbset -depth 24
If you have a GUI (X) running, then add an "xrefresh" on the end of that to force a redraw of all windows.
by rpdom
Wed Feb 12, 2014 6:16 am
Forum: General discussion
Topic: Heat Sinks, Do YOU need them.
Replies: 86
Views: 195292

Re: Heat Sinks, Do YOU need them.

Enjoyed reading this discussion - I have overclocked and I do have heatsinks. I have been worried about heat and yes, you can find out the temp: vcgencmd measure_temp Mine were at 60c before I overclocked and 62 overclocked which I felt was too high. (I panic if my PCs CPUs - two Intel i7 3770K's -...
by rpdom
Wed Feb 12, 2014 6:07 am
Forum: General discussion
Topic: Can't search on site for help!
Replies: 11
Views: 1356

Re: Can't search on site for help!

The default search for the forums isn't good with such searches. You're better off using google. Try a google search on "site:raspberrypi.org wifi help", as that will limit the results to this site. Words other than the very generalised "help" might improve results, "config" or "setup" for example. ...
by rpdom
Tue Feb 11, 2014 7:28 am
Forum: Advanced users
Topic: How to lock SD card with the device
Replies: 42
Views: 13306

Re: How to lock SD card with the device

batrashish wrote:Please let me know how to use the mailbox command, which can bypass the OS.
I've only done it in assembler in a Bare Metal environment, but it should be fairly easy in C under Linux.

Here's a link that will help you http://www.raspberrypi.org/forum/viewto ... 31&t=18936
by rpdom
Tue Feb 11, 2014 7:21 am
Forum: Advanced users
Topic: How to lock SD card with the device
Replies: 42
Views: 13306

Re: How to lock SD card with the device

How about MAC ID instead of Serial number? It can be spoofed. And the model A Pi doesn't have one. Actually the model A Pi does have one. It just isn't used for anything. The default MAC address is the Raspberry Pi Foundation's ID B8:27:EB followed by the last 6 hex-digits of the serial number.
by rpdom
Tue Feb 11, 2014 7:12 am
Forum: Troubleshooting
Topic: Raspberry Pi doesn't connect to internet
Replies: 4
Views: 823

Re: Raspberry Pi doesn't connect to internet

So, your physical connection seems to be ok from your description of the LEDs (also you have a Rev. 1 board as it says "10M" instead of "100". But you don't have an IP address assigned. Without that the ping and other commands can't work. Could you show us the contents of the /etc/network/interfaces...
by rpdom
Tue Feb 11, 2014 7:04 am
Forum: General discussion
Topic: If you want a really fantastic product..
Replies: 3
Views: 941

Re: If you want a really fantastic product..

The wire in the cables is probably too thin. This happens a lot with cheap uUSB cables. No need to throw them away. If you are handy with a soldering iron and have a few lengths of decent twin cable around you can cut off the plugs from each end, leaving a short length of the original cable, and sol...
by rpdom
Tue Feb 11, 2014 6:32 am
Forum: Advanced users
Topic: How to lock SD card with the device
Replies: 42
Views: 13306

Re: How to lock SD card with the device

The first loophole is in step a). You are relying on the OS not to lie to you about the serial number. That isn't a real problem. It is fairly trivial to bypass the OS and get the serial number direct from the system using a mailbox call. However, it isn't hard to examine the code of a compiled C r...
by rpdom
Mon Feb 10, 2014 11:33 am
Forum: Advanced users
Topic: How ro start a script/application in background as root on b
Replies: 8
Views: 1774

Re: How ro start a script/application in background as root

2 ways [there are more] use @reboot in crontab use /etc/rc.local put full paths to everything both these run as root Actually the crontab method runs the script/programs as the user the crontab belongs to. If you use "crontab -e" as "pi", then it will edit the "pi" crontab and run under user pi. If...
by rpdom
Mon Feb 10, 2014 9:47 am
Forum: General discussion
Topic: Dual Boot of Linux.
Replies: 10
Views: 2764

Re: Dual Boot of Linux.

A slightly customised Debian system should do the job, as Raspbian is basically Debian optimised for the Raspi's CPU.

It should be quite easy, as Debian supports multi-boot on PCs.

[edit]A Debian Live CD (or USB) system is also a possibility.
by rpdom
Mon Feb 10, 2014 8:00 am
Forum: General discussion
Topic: power multiple pi
Replies: 3
Views: 871

Re: power multiple pi

I have a 5-Port USB charger that claims to be rated at 40W total, which should be plenty of power for five Raspis (or possibly eight if you use a splitter cable). I haven't got five, so have only (so far) used it to power one Pi and charge my phone and my wife's kindle at the same time. It seems to ...
by rpdom
Mon Feb 10, 2014 7:09 am
Forum: Advanced users
Topic: How to lock SD card with the device
Replies: 42
Views: 13306

Re: How to lock SD card with the device

To make sure what people can see in the card contents, I tried to read the card in the SD card reader to see the python files in the home directory of "pi". But I was not able to see these files in the SD Card when read in Windows machine. I believe that home directory is not Fat32 Partition that i...
by rpdom
Mon Feb 10, 2014 7:05 am
Forum: General discussion
Topic: power the usb
Replies: 1
Views: 356

Re: power the usb

All model B except the very early ones will pass power through to USB. But this power is limited by the F3 fuse on the Pi. The early Rev.1 versions don't have the two large "mounting" holes in the board, and they have green-coloured components (fuses) F1 and F2 between the USB socket and the LEDs. S...
by rpdom
Mon Feb 10, 2014 5:52 am
Forum: Troubleshooting
Topic: Raspberry Pi doesn't connect to internet
Replies: 4
Views: 823

Re: Raspberry Pi doesn't connect to internet

When you say that internet isn't working, what checks have you run and what exactly does/doesn't work?

Does your interface get an IP address?

Do the Link/100/FDX LEDs light up?

Does USB work?

Can you ping your router by IP address?

Can you ping 8.8.8.8?

That will help identify the real problem.

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