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by rpdom
Thu Apr 25, 2013 5:03 am
Forum: Beginners
Topic: NTP Again
Replies: 11
Views: 8084

Re: NTP Again

Bizarre..... It still just works out of the box for almost everyone but you it seems. If it didn't have ntpd built in and pre-configured to fudge over the lack of an hardware clock, I'd favour ntpdate (sudo apt-get install ntpdate) and running it from a cron a few times a day. Which is what I've do...
by rpdom
Thu Apr 25, 2013 4:58 am
Forum: Beginners
Topic: Where is the official documentation?
Replies: 11
Views: 1618

Re: Where is the official documentation?

Do they not even have an official pinout of the breakout header? Or specify which MCU pins each breakout header pin goes to? There is no need, as the pinouts on elinux are correct. They are based on information provided by the Foundation and the official schematic http://www.raspberrypi.org/wp-cont...
by rpdom
Wed Apr 24, 2013 7:39 pm
Forum: General discussion
Topic: Moving to larger SD
Replies: 5
Views: 11640

Re: Moving to larger SD

What size is your current SD card?

If larger than 2GB, did you use the raspi-config option to expand the system to use the whole card?
by rpdom
Wed Apr 24, 2013 6:01 pm
Forum: Beginners
Topic: SD card "shrunk" after writing Raspbian image to it?
Replies: 9
Views: 12162

Re: SD card "shrunk" after writing Raspbian image to it?

hi im really worried i have a 16gb sd card and after writing the image it says i have a maximum sd card space of 55mb instead of the previous 16gb. i can understand the total amount of space free decreasing but not the maximum of memory on the sd card decreasing. plz help :( Have you read the repli...
by rpdom
Wed Apr 24, 2013 5:02 pm
Forum: General programming discussion
Topic: Determine if connected TV is on during boot
Replies: 1
Views: 698

Re: Determine if connected TV is on during boot

/opt/vc/bin/tvservice -s will show the current state of the video output.

Unless you have overridden it with force/ignore hotplug in config.txt, it will mention HDMI when the TV is connected and powered on, and PAL or NTSC if it is off (when defaulting to composite output)
by rpdom
Wed Apr 24, 2013 4:57 pm
Forum: Beginners
Topic: Cannot resolve host name
Replies: 19
Views: 6984

Re: Cannot resolve host name

Something is very odd if you can't ping 8.8.8.8. Pings could be blocked by your network, I suppose.

198.248.36.36 is a public IP address. Did your network admin allocate that for you?

Most people will be behind a NATed firewall/router and get 192.168.x.y, 172.16.x.y or 10.x.y.z addresses.
by rpdom
Wed Apr 24, 2013 4:08 pm
Forum: Beginners
Topic: persistent Wrong Hash value
Replies: 3
Views: 716

Re: persistent Wrong Hash value

The "3613d5c1c29e9c1f17e274dfe9444bf8b9b3682" value is very similar to the value I get from checking an unzipped image. So close, in fact, that I could quite believe that the above sum had been typed by hand with typos, rather than copy/paste. Compare the two... 3613d5c1c29e9c1f17e274dfe9444bf8b9b36...
by rpdom
Wed Apr 24, 2013 3:35 pm
Forum: Beginners
Topic: Cannot resolve host name
Replies: 19
Views: 6984

Re: Cannot resolve host name

Please post the output from the following commands:

ip route

ip addr
by rpdom
Wed Apr 24, 2013 2:12 pm
Forum: Networking and servers
Topic: Computer Science Networking
Replies: 43
Views: 9654

Re: Computer Science Networking

This is the sort of thing that dnsmasq is good at. You set it up as the DHCP/DNS server for your local subnet. Add your local machine names to /etc/hosts on the machine it is running on. When some one queries a hostname, it will first check its local cache, then the local /etc/hosts, then the extern...
by rpdom
Wed Apr 24, 2013 1:22 pm
Forum: General discussion
Topic: Raspberry Pi B will not boot.
Replies: 1
Views: 303

Re: Raspberry Pi B will not boot.

Firstly, forget the pre-loaded image. Many of them are out of date and will not work with a lot of recent Pis. Download the latest version of Raspbian Wheezy and install that onto the card as per the instructions on the Downloads link from the main Raspberry Pi page. If that doesn't boot either, che...
by rpdom
Tue Apr 23, 2013 7:05 pm
Forum: Bare metal, Assembly language
Topic: screen04 from the bare metal programing articles
Replies: 8
Views: 1791

Re: screen04 from the bare metal programing articles

This version of kernel.ld seems to work well for all my code so far :) /****************************************************************************** * kernel.ld * by Alex Chadwick * * A linker script for generation of raspberry pi kernel images. ****************************************************...
by rpdom
Tue Apr 23, 2013 6:54 pm
Forum: Raspbian
Topic: Lost new files after power off
Replies: 5
Views: 1199

Re: Lost new files after power off

Ok, a proper shutdown switch is your best bet, but otherwise you could always put a "sync" in your script after every file update. That will reduce the probability of damage..
by rpdom
Tue Apr 23, 2013 6:11 pm
Forum: Raspbian
Topic: Lost new files after power off
Replies: 5
Views: 1199

Re: Lost new files after power off

1. Don't pull the power without doing a proper shutdown first. Either from GUI or from command line. Recently written data is held in memory before it is written to the card because it makes the system quite a lot faster. 2. You can force all files to be written to the card by opening a terminal and...
by rpdom
Tue Apr 23, 2013 5:59 pm
Forum: Beginners
Topic: Installing at, atq and atrm
Replies: 2
Views: 1680

Re: Installing at, atq and atrm

Install the "at" package.

sudo apt-get update
sudo apt-get install at
by rpdom
Tue Apr 23, 2013 4:22 pm
Forum: Beginners
Topic: How good webrowser will the Raspberry give me ?
Replies: 15
Views: 2331

Re: How good webrowser will the Raspberry give me ?

Flash exists for some Linux. Not for the Pi.

Gnash is available and will run some Flash apps, but is slow on Pi.
by rpdom
Tue Apr 23, 2013 2:25 pm
Forum: HATs and other add-ons
Topic: Heatsinks Really Needed?
Replies: 2
Views: 1588

Re: Heatsinks Really Needed?

Unless operating in extreme conditions, no heatsink is needed. Some people say "But the chip is *hot* when I touch it". Yes, it will feel hot. It's warmer than your finger. To put it in perspective, my Pi's CPU rarely gets above 50 degrees C. My old Pentium-4M laptop idles at 47C, and the cooling fa...
by rpdom
Tue Apr 23, 2013 7:00 am
Forum: Beginners
Topic: HD to DVI-D
Replies: 2
Views: 479

Re: HD to DVI-D

Your Pi might not be detecting that it is connected to a monitor when using a HDMI to DVI-D cable. It is possible you may need to set "hdmi_force_hotplug=1" in the config.txt file in the /boot directory. This will disable the auto-detect and force the Pi to use the HDMI output.
by rpdom
Tue Apr 23, 2013 6:25 am
Forum: Beginners
Topic: Determining IP address and getting started
Replies: 7
Views: 8900

Re: Determining IP address and getting started

So, what you're trying to do, if I got it right is: [internet]---[wifi-router]~~~~~~~~(wlan0)[ubuntu-laptop](eth0)---------(eth0)[Pi] The WiFi is running on a 192.168.x.x subnet and the ethernet connection is on a 10.x.x.x subnet. Right? The Ubuntu laptop should have two network addresses then. 192....
by rpdom
Tue Apr 23, 2013 4:57 am
Forum: Beginners
Topic: USA keyboard setup, @ vs"
Replies: 2
Views: 1766

Re: USA keyboard setup, @ vs"

Use raspi-config (sudo raspi-config) and look at the options for setting keyboard, location and timezone. There is a setting for US in there somewhere.
by rpdom
Tue Apr 23, 2013 4:54 am
Forum: Beginners
Topic: Determining IP address and getting started
Replies: 7
Views: 8900

Re: Determining IP address and getting started

I am wondering whether it is possible to install Ubuntu OSes on Pi ( as its ARM11 and ubuntu suports ARM7 and up) No. Ubuntu will not run on a Pi. You are right to say that the CPU on the Pi is an ARM11 chip, but that's just the chip number, not what type of ARM architecture it is. The Pi uses ARMv...
by rpdom
Mon Apr 22, 2013 1:11 pm
Forum: Troubleshooting
Topic: How to check output of power supply (Nokia phone charger)
Replies: 18
Views: 3335

Re: How to check output of power supply (Nokia phone charger

drgeoff wrote:
rpdom wrote:I think it would be possible to make a bargraph display with (up to) 10 LEDs on a 4017 chip.
Which "4017 chip" are you thinking about?
Oh bother. Been thinking about other projects.

I mean LM3914, of course!
by rpdom
Mon Apr 22, 2013 12:26 pm
Forum: Troubleshooting
Topic: How to check output of power supply (Nokia phone charger)
Replies: 18
Views: 3335

Re: How to check output of power supply (Nokia phone charger

I think it would be possible to make a bargraph display with (up to) 10 LEDs on a 4017 chip. Use a 3.3v reg to make sure the chip gets a fixed voltage, a couple of resistors to divide the input voltage by 2, to get it under 3.3v. A chain of resistors to set the hi/lo reference voltages for the 4017 ...
by rpdom
Sun Apr 21, 2013 7:37 pm
Forum: General discussion
Topic: Backup SD card using Pi
Replies: 3
Views: 693

Re: Backup SD card using Pi

If you have another Linux box to use for backup, that would most likely be a faster way to do it. My idea was for people who only have Windows systems and use the disk imager program that can't cope with restoring to a smaller card, or for people who only have a Pi. I haven't done any accurate timin...
by rpdom
Sun Apr 21, 2013 6:50 pm
Forum: Troubleshooting
Topic: Simultaneous HDMI and Analog Video
Replies: 5
Views: 1166

Re: Simultaneous HDMI and Analog Video

No. You can use HDMI or composite/RCA, not both at once.
by rpdom
Sun Apr 21, 2013 4:58 pm
Forum: General discussion
Topic: Windows Compatiability
Replies: 39
Views: 4558

Re: Windows Compatiability

Quite. Some years back, someone asked me if I could advise them on how to fix the wireless on their Win98 box (I said it was a while ago). I told them that I don't run windows, so couldn't help them (actually, I used to run W98 before that, but telling someone in a pub how to set up wifi is pretty m...

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