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by rpdom
Thu Aug 15, 2013 6:04 am
Forum: Other projects
Topic: How to use this?
Replies: 5
Views: 1126

Re: How to use this?

So just get a standard 12v power adaptor kinda like this one? http://static.musiciansfriend.com/derivates/19/001/339/446/DV020_Jpg_Jumbo_703407.jpg This is just a random one from google images. I want to plug it into the wall. Ideally one that says "OUTPUT : DC12V" on it, not "DC9V"! I'd wait until...
by rpdom
Thu Aug 15, 2013 5:58 am
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 113609

Re: Design flaw? Polyfuses for USB current limiting

Have you measured the Pi voltage (between TP1 and TP2) when running?

That will show if you are getting the 4.75V to 5.25V that is needed.
by rpdom
Thu Aug 15, 2013 5:43 am
Forum: General discussion
Topic: USB 3.0 is it ever going to be added?
Replies: 2
Views: 431

Re: USB 3.0 is it ever going to be added?

As the USB comes from the GPU (via the LAN/HUB chip on a model B), and that is USB 2.0, it cannot be changed without a complete redesign of the Pi.

So, the answer is "no".
by rpdom
Thu Aug 15, 2013 5:41 am
Forum: Troubleshooting
Topic: SD card write protected
Replies: 9
Views: 8214

Re: SD card write protected

Built it SD card slots are known to have problems. Sometimes it is because they don't support SDHC cards, which is basically any card over 2GB.

The best thing to do is to buy a cheap USB SD card reader from a "pound" shop or similar and use that. They usually work without any problems.
by rpdom
Wed Aug 14, 2013 2:46 pm
Forum: Beginners
Topic: How to check for USB on boot?
Replies: 2
Views: 433

Re: How to check for USB on boot?

Personally I would remove chromium from boot and add a script to the boot process. You can use a simple bash script, just run a grep on dmesg for the ID of the device you want to look for and run chromium if it returns an answer Yes, this would work :) Or you could use the output of lsusb to check ...
by rpdom
Wed Aug 14, 2013 1:43 pm
Forum: HATs and other add-ons
Topic: Asda £1.75 webcam works with the Raspberry Pi
Replies: 6
Views: 3745

Re: Asda £1.75 webcam works with the Raspberry Pi

I've been checking my local asda every time I go (last time was a couple of hours ago). The cheapest webcam I've seen is £10. A pity, because I have a project in mind that would use a couple of cheap low-res cameras to monitor something.
by rpdom
Wed Aug 14, 2013 1:16 pm
Forum: General discussion
Topic: Design flaw? Polyfuses for USB current limiting
Replies: 245
Views: 113609

Re: Design flaw? Polyfuses for USB current limiting

hfc wrote:no F1 or F3...but still the 47.5 C32 polyfuse
C23 is a 47uF capacitor, not a polyfuse. I can't see how that could be causing any problems.
by rpdom
Wed Aug 14, 2013 10:02 am
Forum: Troubleshooting
Topic: Getting audio out working on the Raspberry P
Replies: 1
Views: 367

Re: Getting audio out working on the Raspberry P

The command is "lsmod" with a lower-case "L", not "1smod" ('ls' for "list" and 'mod' for "modules")
by rpdom
Wed Aug 14, 2013 9:32 am
Forum: Other programming languages
Topic: SQL statement / PHP issues
Replies: 3
Views: 799

Re: SQL statement / PHP issues

It will return both echo's if the statement is true or false any ideas why? The query will always return a success status (unless it hits an error), even if it returns no data. You could try something like this to check the number of rows found: $sql4 = "SELECT * FROM ".$tablename." WHERE forward =...
by rpdom
Wed Aug 14, 2013 9:16 am
Forum: Beginners
Topic: Raspberry Pi A to B
Replies: 6
Views: 873

Re: Raspberry Pi A to B

sanjayd wrote:What is the difference between A and B besides LAN interface.
The A only has one USB socket and 256MB of RAM. It also uses less power because of the missing LAN/USB components.
by rpdom
Tue Aug 13, 2013 4:25 pm
Forum: Troubleshooting
Topic: SD Card Problems
Replies: 13
Views: 3082

Re: SD Card Problems

What itimpi said, except that the last command should be

Code: Select all

sudo rpi-update
not

Code: Select all

sudo apt-get rpi-update
by rpdom
Mon Aug 12, 2013 6:22 pm
Forum: Raspbian
Topic: How often does the Pi (Rasbian) update it's clock?
Replies: 21
Views: 4865

Re: How often does the Pi (Rasbian) update it's clock?

Joe Schmoe wrote:Check out the "-g" option (to ntpd).
The "-g" option is already set. It only works once per invocation. ie. at startup.

Restarting ntpd once the network is available again will set the clock correctly: sudo /etc/init.d/ntp restart
by rpdom
Mon Aug 12, 2013 4:34 pm
Forum: Raspbian
Topic: How often does the Pi (Rasbian) update it's clock?
Replies: 21
Views: 4865

Re: How often does the Pi (Rasbian) update it's clock?

If the time is more than a few minutes out when ntpd starts, it will set the time directly. After that it will only speed up or slow down the system clock slightly until the time is correct. If the Pi was without internet, but still running, for 48 hours, I'd expect the system clock to drift a bit, ...
by rpdom
Mon Aug 12, 2013 3:53 pm
Forum: Raspbian
Topic: How often does the Pi (Rasbian) update it's clock?
Replies: 21
Views: 4865

Re: How often does the Pi (Rasbian) update it's clock?

Very strange… So the 36 minute offset must have been due to faulty servers or Internet being down without the Pi being down? Was that offset when the Pi started up, or when it had been running for some time? At initial start up, the fake hardware clock software sets the time to that of the last shu...
by rpdom
Mon Aug 12, 2013 3:37 pm
Forum: Raspbian
Topic: How often does the Pi (Rasbian) update it's clock?
Replies: 21
Views: 4865

Re: How often does the Pi (Rasbian) update it's clock?

The Pi uses ntpd. The default for that is to sync every 5 minutes if possible.
by rpdom
Mon Aug 12, 2013 1:58 pm
Forum: Off topic discussion
Topic: Are microwave oven food healthy?
Replies: 57
Views: 9673

Re: Are microwave oven food healthy?

What about CDs and DVDs? They are very pretty if "cooked" for 3-4 seconds on full power, but don't smell too good. Also the likelihood of being able to read them afterwards is rather low. (Don't try this at home kids) [edit] A friend of mine tried to microwave an egg once. He managed to fix the door...
by rpdom
Mon Aug 12, 2013 10:26 am
Forum: General discussion
Topic: 7 port usb hub
Replies: 7
Views: 3064

Re: 7 port usb hub

I got a hub that looks like that, and it is rubbish. In the bin now. As RaTTus said, there are a few hubs that look like that. They have different chips inside. Some are good and some are bad. On mine the sockets were out of line and badly soldered. Four of the ports are only working as USB 1.1, eve...
by rpdom
Mon Aug 12, 2013 10:19 am
Forum: General discussion
Topic: embeded windows
Replies: 17
Views: 4266

Re: embeded windows

ric96 wrote:i know pi is a linux board
No. The Pi is an ARM board. It will run any OS that supports it.

Just like your PC can run Linux, or Windows, or anything else that supports that (intel/AMD) CPU and hardware.
by rpdom
Mon Aug 12, 2013 7:55 am
Forum: Beginners
Topic: How to see whats been installed in RPi?
Replies: 3
Views: 947

Re: How to see whats been installed in RPi?

The important bit is the "ii" at the beginning of the line from dpkg -l. The first "i" means "Install has been requested", and the second "i" means "Installed successfully".

You could do

Code: Select all

dpkg -l | grep "^ii"
To only show software that is currently installed. It will be a big list!
by rpdom
Mon Aug 12, 2013 6:16 am
Forum: Raspbian
Topic: Cannot check root file system ... not mounted read
Replies: 7
Views: 4446

Re: Cannot check root file system ... not mounted read

why would a machine be faster booting from an external USB hard drive ? That makes no sense to me, I would be very surprised if a pi could boot in less than 1 min booting from a USB disk. Pete Because the USB interface is faster than the SD card interface? As for how long it takes to boot, is that ...
by rpdom
Sun Aug 11, 2013 11:37 am
Forum: Troubleshooting
Topic: OverClock the RPI
Replies: 4
Views: 1456

Re: OverClock the RPI

Yes, it is safe. You cannot physically damage your Pi by overclocking, although you can void the warranty if you set certain things too high (I think it is force_overclock=1 and overvolt=something high). Not all Pi's are equal. Some will overclock higher than others. Try it and see :) I do advise yo...
by rpdom
Sun Aug 11, 2013 7:53 am
Forum: Python
Topic: GPIO No errors but not working
Replies: 7
Views: 2090

Re: GPIO No errors but not working

A bulb will take more power than the GPIO pins can supply. It may even damage the GPIO drivers inside the Pi! :-( When you use the 3.3V pin, you are connect directly to the 3.3V regulator and can take as much as that is able to supply, which is quite a bit more than the default 16mA or so that the G...
by rpdom
Sat Aug 10, 2013 4:27 pm
Forum: Bare metal, Assembly language
Topic: Bare Metal SD Card solution
Replies: 11
Views: 4876

Re: Bare Metal SD Card solution

I know at least one person has done this successfully in C. It's something that I keep meaning to look at and translate into assembler. Rather than me giving you a long list of possible links, you should google for site:raspberrypi.org bare metal sd card There are quite a few posts that should be he...
by rpdom
Sat Aug 10, 2013 4:21 pm
Forum: Troubleshooting
Topic: Trying to Remove OS + Install New
Replies: 7
Views: 1061

Re: Trying to Remove OS + Install New

I always knew it as "Pipped to the post", as in "only just beaten to the finish line"
by rpdom
Sat Aug 10, 2013 4:17 pm
Forum: General discussion
Topic: Status LED's
Replies: 2
Views: 450

Re: Status LED's

Sorry, but they aren't available on any of the connectors. Obviously the PWR LED is connected to the 3.3V power line, so that is easy to duplicate. The OK/ACT LED is connected to GPIO16, but that isn't connected to anything else. You might be able to do something in software to mirror it. The LAN LE...

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