quarta-feira, dezembro 26, 2012

Misterio desvendado #irobot #aspirador #roomba



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segunda-feira, dezembro 24, 2012

terça-feira, dezembro 11, 2012

Race time #neon #fish #aqua



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How to enable and configure Group Policy setting in Windows RT

Along with the recent release of Windows 8 Microsoft also released Windows RT which is pretty much Windows 8 designed to operate on ARM based processors. For consumers the most obvious difference of this OS is the lack of ability to run legacy software. In enterprises however the biggest missing feature is that this OS is not joinable to a domain and thus cannot be configured using Group Policy.


HOWEVER…. It is still possible with a very minor configuration changes to enable a Windows RT device to be configured via Local Group Policy.


To begin with, you might remember my blog post What’s changed with the Group Policy Client Service in Windows 8 where I explain that the Group Policy service will shutdown after a period of 10 minutes when not in use. Well, with Windows RT there are no Local Group Policy settings configured out of the box so by default the Group Policy Client service is as always disabled. Therefore before we configure the local group policy on a Windows RT device we first need to enable the local group policy service which you can get into via the Computer Management option from the system menu (See image below).



Once you are into the Computer Management tool navigate to the Services section and find the Group Policy Client Service.


Note: As mention before this service is disabled by default in Windows RT.



Now configure the Group Policy Service start up type to be Automatic and then manually start the service.



Now that the services is started you will be able to modify any of the Local Group Policy as per normal by setting by running “MMC” from the start menu then loading the Local Computer Policy snap in. As you can see in the image below I have used the Local Policy to configure the Default Lock Screen image as I mention in my previous blog post How to use Group Policy to change the Default Lock Screen image in Windows 8



That is pretty much it… ]While it is still disappointing that these devices cannot be managed via Group Policy at least you can still configure the policy settings on these device when you just want to make some minor tweaks.


Side Note: This blog post was completely written using on a Windows RT, for those of you who are lamenting the fact that there is no Windows Live Writer for Windows RT the blogging feature in Word 2013 is pretty much an exact replacement for this application (see image below).








via Group Policy Central http://www.grouppolicy.biz/2012/12/how-to-enable-and-configure-group-policy-settings-in-windows-rt/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+GroupPolicyCenter+%28Group+Policy+Central%29

How to use Group Policy to change the Default Lock Screen image in Windows 8

image Microsoft recently release the November 2012 Cumulative Update for Windows 8/2012 that enables you to configure the default lock screen image for Windows 8 (See quote below).



Enable enterprise customers to customize the default lock screen.



You may have thought that this image was customisable by the users in the control panel already however this would only configure the image of the lock screen after the user had logged on to the computer. Meaning you were always presented with the Seattle Space Needle cartoon image every time you logged off or rebooted your computer. This image is nice to look at but this is definitely something the would be changed in most corporate environment to display their own corporate logo or a perhaps some disclaimer text.


The new setting is called “Force a specific default lock screen image” it can be found under Computer Configuration > Policies > Administrative Templates > Control Panel > Personalization.


Note: It will only appear after you November 2012 update is installed on the computer you are editing the group policy object from but you must ALSO apply it to the workstation/server that the setting is being applied.


Before


image


After


image


After you have installed it you can then configure the setting to use a different default lock image.


Below is an example that I have configured to use the default wallpaper as also the default lock screen image.


image


As you can see the default lock screen image is now configured to be the default wallpaper but you can specify it to be any image file you like on the local HDD or the network.


image


Below is an image of the GP Results report that has the setting applied successfully…


image


Note: If you apply this to a computer setting to computer without the November 2012 update installed it will do nothing and you will get an “Extra Registry Key” setting when you run a GP Results report on that computer (see image below).


image


More info see: http://support.microsoft.com/kb/2770917







via Group Policy Central http://www.grouppolicy.biz/2012/11/how-to-use-group-policy-to-change-the-default-lock-screen-image-in-windows-8/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+GroupPolicyCenter+%28Group+Policy+Central%29

segunda-feira, dezembro 10, 2012

Plan 9 operating system for the Raspberry Pi – demonstration by Richard Miller

There’s not much I can say about this except that it’s tremendously impressive – if you’re a bit of a geek (like me). If you think computers are all about fancy-pants graphics and visual effects, this one might not be for you. Wink


Richard Miller demonstrated his recently finished Raspberry Pi port of the Plan 9 operating system at the Oxford Raspberry Jam in November 2012. I caught most of it on film.


Plan 9 is a very lightweight and powerful operating system that is written for software developers. I find it very impressive indeed. Hope you like it. At the end Richard recompiles the kernel in a little over a minute.



One of the things Richard said while I was not filming was that the hardest part was writing the USB driver.






via RasPi.tv http://raspi.tv/2012/plan-9-operating-system-for-the-raspberry-pi-demonstration-by-richard-miller

Review of ModMyPi case for the Raspberry Pi

I was looking for a Rev 2 Pi, as I wanted one to see if the revision checker function of the Python Gertboard programs worked properly.


Farnell was quoting up to 3 weeks lead time, RS are out of stock. Frown Nobody else seemed to have it in stock, but over at ModMyPi, they said they would have some in within a few days. Sold to the man in a hurry Razz It turned out that it was with me within 48 hours, which was excellent.


If you buy a Raspberry Pi from ModMyPi you have to buy a case as well (it comes out at around £40 delivered – with a case). But the cases looked interesting and you can mix and match the colours for top and bottom section. So I bought one with a black base and a white top. I know – boring! They offer some lovely bright colours, but I wanted to stick a RasPi.TV label on the top – so white seemed like a good choice to go with the RasPi.TV logo. And black seemed practical for the base.



The whole case with RasPi inside.



Looking at the case, I have to say I think it’s really well thought through and cleverly designed. I like it. Yes


The base makes use of the Rev 2 board’s holes so you can attach the RasPi board to the base with two small screw bolts (provided).



Underneath the base – optional rubber feet are provided too



The top or ‘lid’ has holes so you can see the LEDS. There are also holes for all the ports, and ventilation holes top and bottom (I’ve covered the top ones with my label ROTFL)



Holes for LEDs to shine through



The ‘lid’ also has a small perforated section over the GPIO ports where you can punch out a slot for easy ‘lid on’ GPIO access.



Closer look at optional GPIO “punch-out” slot



I haven’t punched mine out because I prefer option 2, which is simply to remove the lid, which you do easily by gently squeezing the “springy thing” on the side. If you don’t squeeze it, the lid is hard to remove – so it won’t come off by accident.



“Springy thing” you press to remove the lid



It’s a beautiful piece of design work. A simple thing – a box, that does its job very, very well.


Most of the time I leave the lid off. The base is invaluable to me for protection against shorting the underside of the board – for example, by putting the Pi down on coins, or keys, or other little bits of wire that seem to follow me around since I got interested in electronics. Grin


If you’re in the market for a case, I can heartily recommend this one as robust, practical and versatile. And the price is right at £5.99. You can view the ModMyPi case selection here.






via RasPi.tv http://raspi.tv/2012/review-modmypi-case

How to Run Raspberry Pi with No Monitor or Network

I went to the 4th Milton Keynes Raspberry Jam on Sunday. Now the thing with Raspberry Jams, is that you never know whether there’s going to be enough monitors to go round (some don’t have any at all). Last time I got one, this time there were not many laid out. I expect I could have had one if I’d have asked, but there was no need. I was prepared.


I had one of these…



USB to ttl serial interface (with 3V3 logic)



This is a USB to serial adaptor, which enables you to connect your Raspberry Pi serial port Tx (white) and Rx (green) pins to the USB port of another computer and login using the Pi’s serial interface.


It also has red (5V) and black (GND) leads. If the 5V lead is connected to the 5V pin on the RasPi, you can actually power the RasPi through your computer’s USB port – if it’s capable of providing enough output. But if you’re powering the RasPi separately, omit the red lead (but still attach the black one).



How to connect the serial-USB adaptor




A closer look



I bought this one from ModMyPi.com and it arrived very promptly. I’ve made another purchase from them recently that went equally well. Yes


If the right settings are configured on the Pi, (and they are by default on Raspbian) this means you can get a command line login console directly on your laptop. You will need to install drivers for the USB interface if you’re using windows. You can download those here.



USB-serial login on Raspberry Pi



Since none of my demos for this Jam involved the GUI (Graphical User Interface – Windows-like interface) this was more than sufficient for me.


What’s the catch?


There isn’t one really, but there are a couple of quirks. You need to unplug the USB dongle if you want to start a new session (in Putty, at least. This is a good reason not to power your Pi with it if you’re likely to need to reset the connection.) You do also have to install drivers on your other computer to run the USB-RS232 adaptor – but that’s normal for any device.


Another Gotcha! (If you have a Gertboard)


If you’ve installed the Arduino IDE for Gertboard using Gordon’s script, you’ll need to uncomment the second line below at the bottom of /etc/inittab


#Spawn a getty on Raspberry Pi serial line

#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100


sudo nano /etc/inittab


and change…


#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

to

T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100


then CTRL+o, Enter, CTRL+x to save and exit. It should look like this…



Edit the last line of /etc/inittab if needed



If you’re running an older version of Debian or Raspbian, you might need to disable the kernel log output on /dev/ttyAMA0 by removing the line “console=ttyAMA0,115200 kgdboc=ttyAMA0,115200″ from /boot/cmdline.txt

But if you’re using a linux distribution (distro) newer than July 2012, you probably won’t need to.


How to do the actual serial port login



  • If using Windows, you’ll need to install the drivers You can download those here.

  • You’ll need a client application, like Putty, which can handle a serial login.

  • You’ll need to configure it, but that’s quite simple.

  • You’ll need to make sure your wires are hooked up correctly (as in the photos above).


You can download Putty from here


Configure Putty for a serial connection:



Settings you need to tweak on Putty




  • choose the virtual COM port that your computer allocates to the USB device (Mine is on COM7). You should be able to find this in “Devices and Printers” if you are a Windows user.

  • select serial connection

  • set the speed to 115200

  • save settings (if you want to)


If your wires are hooked up right, it should now just be a question of clicking Open to start a connection.


When you are faced with this screen (minus the yellow text I’ve added)…



Logging into your Pi with Putty through serial port





…just press enter and you should get a login prompt.

You can only use this as a terminal. You can’t view LXDE through it. But if a terminal is what you want, this does the job very nicely indeed. And since you can power your Pi with it too, it makes quite a useful tool for people who do demos at Raspberry Jams and other places.


I hope this is useful for you Grin






via RasPi.tv http://raspi.tv/2012/how-to-run-raspberry-pi-with-no-monitor-or-network

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