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by rpdom
Sun Feb 23, 2014 2:35 pm
Forum: General discussion
Topic: Raspberry Pi with more RAM
Replies: 43
Views: 10413

Re: Raspberry Pi with more RAM

Agree with jamesh. You'd be better off configuring a swapfile/partition on a USB device - nowhere near as fast as main memory, but faster than any method using GPIO pins and fully supported by default in Linux. You could have many GB of virtual memory using that method.
by rpdom
Sun Feb 23, 2014 8:56 am
Forum: Other projects
Topic: PiFan - Fan on a case mod
Replies: 9
Views: 4515

Re: PiFan - Fan on a case mod

USB 2.0 Spec is 500mA and 3.0 is I believe 900mA, however the Rev1.0 Pi did not support current output that high, with a maximum output current of around 100mA across both ports. Rev 1.1 relieved this issue. Doing your mod on a 1.0 board would have tripped the polyfuse on the USB ports. Not arguing...
by rpdom
Sun Feb 23, 2014 8:36 am
Forum: Troubleshooting
Topic: Slow Data Transfer to External HDD Drive
Replies: 7
Views: 3476

Re: Slow Data Transfer to External HDD Drive

I'd recommend ext4 as the faster, more resilient file system.

The Linux NTFS drivers can be very cpu intensive and slow.
The network card is 100MBps
No, it is 100Mbps (Capitalisation is important), and you may get a bit more than half that on a good day, like all 100Mb ports.
by rpdom
Sun Feb 23, 2014 8:34 am
Forum: Other projects
Topic: PiFan - Fan on a case mod
Replies: 9
Views: 4515

Re: PiFan - Fan on a case mod

290mA is well within the USB spec of 500mA. Yes, it is within the max current spec that a USB port might supply. But the actual spec says that a USB port only needs to supply 100mA, which is what the Pi is designed to do. Anyway, ambient temp of 30°C isn't very high. The important figure is how hot...
by rpdom
Sun Feb 23, 2014 8:28 am
Forum: Python
Topic: GPIO help
Replies: 8
Views: 1827

Re: GPIO help

I haven't done it in gpio, or in python, but I have written a perl script that uses /dev/input to pretend it is a keyboard. Perl is already installed on the Pi, so it will take a few KBytes of card space for something like that to work. It is just a matter of interfacing to GPIO. But I recall there ...
by rpdom
Sun Feb 23, 2014 8:22 am
Forum: General discussion
Topic: run programs at CLI from web
Replies: 10
Views: 3502

Re: run programs at CLI from web

That is fairly easy in PHP. You need the php library for the webserver installed, then you just code pages with a .php extension instead of .html. Having fixed function buttons instead of a cmdline type interface is a lot safer, but you still need to look at security to make sure that the informatio...
by rpdom
Sun Feb 23, 2014 8:15 am
Forum: Beginners
Topic: HDMI to DVI and mode 68/69 issue [SOLVED]
Replies: 2
Views: 751

Re: HDMI to DVI and mode 68/69 issue

You could try what worked for me (on a different DVI-D monitor at a different res). Take the edid dumpfile and save it in /boot (as edid.dat, I think - can't get to my Pi to check right now), and use the hdmi_edid_file=1 option in config.txt to tell it not to probe for monitor settings, but to use t...
by rpdom
Sat Feb 22, 2014 8:11 pm
Forum: Troubleshooting
Topic: 2.61 Volt between TP1 and TP2. result: No boot
Replies: 13
Views: 2373

Re: 2.61 Volt between TP1 and TP2. result: No boot

As you say you have F1 and F2 fitted (fuses or links?), you probably have a very early model Pi.

On some of these it is normal for IC3 to get rather hot due to a slight design flaw. It shouldn't affect the running of the Pi though.
by rpdom
Sat Feb 22, 2014 7:20 pm
Forum: Troubleshooting
Topic: Strange filesystem corruptions on external usb disk
Replies: 2
Views: 575

Re: Strange filesystem corruptions on external usb disk

Some externally powered disks cheat. They use an external supply for the 12V supply, but still take all their 5V power from the USB port. Are you using an externally powered USB hub for the disk as well? I have a fully externally powered (ext4) USB disk and have never had any corruption on it other ...
by rpdom
Sat Feb 22, 2014 7:23 am
Forum: Advanced users
Topic: alternative version isc-dhcp-server
Replies: 18
Views: 5875

Re: alternative version isc-dhcp-server

The steps you list are the correct way to upgrade to Jessie.

Don't worry about F2FS, the partition type will not be changed unless you install from an image file (which overwrites everything).

Take a backup first, if possible.

I upgraded to jessie and didn't hit any problems.
by rpdom
Sat Feb 22, 2014 6:44 am
Forum: Troubleshooting
Topic: 2.61 Volt between TP1 and TP2. result: No boot
Replies: 13
Views: 2373

Re: 2.61 Volt between TP1 and TP2. result: No boot

It could be the voltage limiting diode (can't remember the ID off hand) near F3 at fault.
by rpdom
Sat Feb 22, 2014 6:08 am
Forum: Raspberry Pi OS
Topic: Error messages during boot
Replies: 5
Views: 1529

Re: Error messages during boot

I think there is a bug in some versions of fsck.vfat that doesn't clear the flag.

Either:

a) don't worry about it

or

b) shove it in a Linux PC that uses a later fsck.vfat and run the check from there. (Stupid Windows can't do it as it doesn't believe the partition exists)
by rpdom
Sat Feb 22, 2014 5:59 am
Forum: General discussion
Topic: RFID reader
Replies: 2
Views: 973

Re: RFID reader

I don't know enough to be able to give you any specific advice, but I've been studying RFID readers recently. Some will plug into USB and pretend they are a keyboard. This means that when a tag comes into range of the reader its serial number will be sent to your Pi as if it was typed in at the keyb...
by rpdom
Sat Feb 22, 2014 5:44 am
Forum: Other projects
Topic: PiFan - Fan on a case mod
Replies: 9
Views: 4515

Re: PiFan - Fan on a case mod

cause4concern wrote:No offense but why would one want to make a quiet thing noisy when it's unnecessary?
To cool down F3 to prevent it from "blowing" when trying to power a 290mA fan via the USB in addition to the power required by the Pi :lol:
by rpdom
Fri Feb 21, 2014 5:51 pm
Forum: General discussion
Topic: Get MAC address of connected client
Replies: 17
Views: 3948

Re: Get MAC address of connected client

MAC addresses only have to be unique to the local network. There is nothing to stop MAC addresses on two different networks from being identical. So the MAC address isn't very useful to identify anyone.
by rpdom
Thu Feb 20, 2014 12:09 pm
Forum: Beginners
Topic: Interesting Programming Language for the 'Pi? [SOLVED]
Replies: 7
Views: 1108

Re: Interesting Programming Language for the 'Pi?

I use (most common first): Bash, PHP, Perl, Assembler and C
by rpdom
Wed Feb 19, 2014 8:55 am
Forum: Beginners
Topic: HDMI to VGA converter, no video
Replies: 44
Views: 193472

Re: HDMI to VGA converter, no video

Getting USB powered is great if you have a powered USB multiport hub.. Remember the Rpi Model A has one USB port and the Model B has two USB ports.. so, not many. You'll need to use at least one for mouse/keyboard. If you are planning to use USB powered devices (other than a low current device like...
by rpdom
Wed Feb 19, 2014 7:56 am
Forum: Beginners
Topic: wheezy too big for card
Replies: 4
Views: 680

Re: wheezy too big for card

Richard: The OP's problem is that they only have a 4GB card, so installing the latest Raspbian wheezy on it shouldn't be a problem. The new maths package can be removed afterwards to recover space.
by rpdom
Wed Feb 19, 2014 7:07 am
Forum: Beginners
Topic: Raspberry Pi running hot?
Replies: 16
Views: 2672

Re: Raspberry Pi running hot?

neilgl wrote:I would get some heatsinks if I were you
Regards,
Because they look pretty? That's the only reason I can see for putting them on.
by rpdom
Wed Feb 19, 2014 6:56 am
Forum: Beginners
Topic: wheezy too big for card
Replies: 4
Views: 680

Re: wheezy too big for card

Only thing I can think of is to get an 8g card... Suggestions? Get an 8GB card ;) Or reformat, install NOOBS, delete all OS image files on the card except Raspbian, boot Pi and Raspbian should install automatically and have just enough space. Or install from a plain Raspbian image using the win32di...
by rpdom
Tue Feb 18, 2014 9:48 pm
Forum: Other projects
Topic: PS/2 keyboard interface
Replies: 13
Views: 5855

Re: PS/2 keyboard interface

redhawk wrote:Could I use this with a PS/2 mouse (obviously using appropriate drivers)??

Richard S.
I don't see why not. The physical interface is the same.
by rpdom
Mon Feb 17, 2014 8:47 pm
Forum: Troubleshooting
Topic: Little or no power to the Pi
Replies: 3
Views: 549

Re: Little or no power to the Pi

That could be the fuse, or there could be something shorted on the Pi side of the fuse which is causing it to stay in the blown state. It might be worth waiting a bit, then powering up with nothing connected to the Pi and the SD card removed. It won't boot, obviously, but you can measure the voltage...
by rpdom
Mon Feb 17, 2014 12:06 pm
Forum: Troubleshooting
Topic: Volume was not properly unmounted ...
Replies: 46
Views: 130824

Re: Volume was not properly unmounted ...

sharix: That's a tricky one. One of the File Allocation Tables is wrong, but you can't tell which. You'll just have to make a guess, I suppose.
by rpdom
Mon Feb 17, 2014 7:24 am
Forum: Troubleshooting
Topic: Little or no power to the Pi
Replies: 3
Views: 549

Re: Little or no power to the Pi

If you connected 5V to any of the GPIO pins other than the 5V ones (2 and 4), you probably have an ex-Pi :(

The GPIO pins are not protected against overvoltage or overcurrent like the USB power connector is. F3 doesn't come into it.

Sorry for your loss :(
by rpdom
Sun Feb 16, 2014 9:16 pm
Forum: Advanced users
Topic: alternative version isc-dhcp-server
Replies: 18
Views: 5875

Re: alternative version isc-dhcp-server

The URL is http://mirrordirector.raspbian.org/raspbian/pool/main/i/isc-dhcp/isc-dhcp-server_4.2.4-7_armhf.deb You can try and install it with dpkg -i but you may hit dependency problems. Try it and see. I can give you links to anything else it asks for. There are ways to use apt-preferences to say "...

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