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by robsbots
Wed Apr 08, 2015 10:01 pm
Forum: Raspbian
Topic: Scrollable desktop
Replies: 0
Views: 292

Scrollable desktop

Hi Is it possible to increase the desktop size on a small screen size and pan across the desktop with the viewable screen area ? I'm using a RPi Display 2.8″ TFT with a screen area of 320×240. If I could have a desktop of 640 by 480 and just view a 320 by 240 chunk at a time that would be perfect. T...
by robsbots
Sat Apr 06, 2013 10:17 am
Forum: Other projects
Topic: Screen setup help request
Replies: 1
Views: 1340

Re: Screen setup help request

It took a bit of time, but I seem to have cracked it. I now have a screen resolution of 1024x768. My config.txt setting are as follows :- # uncomment if you get no picture on HDMI for a default "safe" mode #hdmi_safe=1 # uncomment this if your display has a black border of unused pixels visible # an...
by robsbots
Fri Apr 05, 2013 1:20 pm
Forum: Beginners
Topic: Connect from Raspberry Pi to other device via TTL
Replies: 3
Views: 1149

Re: Connect from Raspberry Pi to other device via TTL

The raspberry pi is NOT 5 volt tolerant. It's GPIO pins run at 3.3 volts, so any hardware connecting to these pins should also use 3.3 volt levels or you will need a level converter to interface to these pins. Connecting standard TTL 5 volt logic to the GPIO pins could damage or destroy the pi. Whi...
by robsbots
Fri Apr 05, 2013 3:53 am
Forum: Troubleshooting
Topic: User name and password
Replies: 26
Views: 340569

Re: User name and password

Make sure you are not using upper case for the user name and the password. If this still does not work, I would try starting from scratch. Download the Raspbain Wheezy from Downloads . Then follow the instructions in the quick-start-guide-v1.1.pdf to write the image to your sd card, boot up and hope...
by robsbots
Fri Apr 05, 2013 3:35 am
Forum: Beginners
Topic: Connect from Raspberry Pi to other device via TTL
Replies: 3
Views: 1149

Re: Connect from Raspberry Pi to other device via TTL

The raspberry pi is NOT 5 volt tolerant. It's GPIO pins run at 3.3 volts, so any hardware connecting to these pins should also use 3.3 volt levels or you will need a level converter to interface to these pins. Connecting standard TTL 5 volt logic to the GPIO pins could damage or destroy the pi. Hit ...
by robsbots
Fri Apr 05, 2013 3:08 am
Forum: Troubleshooting
Topic: User name and password
Replies: 26
Views: 340569

Re: User name and password

When you type the password, the characters are not displayed on the screen. Just type the password and press enter. It should then log you in or prompt for a new user name and password if it was not correct. If you fail to get in with 'pi' and 'raspbian' you might try 'pi' as the username and 'raspb...
by robsbots
Fri Apr 05, 2013 2:21 am
Forum: Other projects
Topic: Screen setup help request
Replies: 1
Views: 1340

Screen setup help request

Hi all. I am having problems trying to set up a screen. I have an hdmi to vga adaptor (hacked to provide a separate power supply for the adaptor) connected to an lcd display. Currently I can not get a resolution other than 640x480 under the x gui. The display is an old vga lcd capable of resolutions...
by robsbots
Fri Mar 29, 2013 3:54 pm
Forum: Media centres
Topic: xbmc idiots guide
Replies: 0
Views: 967

xbmc idiots guide

Hi all. Just wondering if there is an idiots guide to getting xbmc running well on a pi and SD tv. I have got xbmc running but the interface is to large for my screen and a little fuzzy. I'm using xbmc 12.1 from raspbmc. I'm in the uk, so the tv is pal rather than ntsc etc. Can I get this to work we...
by robsbots
Sat Jan 19, 2013 5:48 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO serials pin problem
Replies: 8
Views: 3121

Re: GPIO serials pin problem

Hi Gordon. The route I am experimenting with at the moment is creating a link from /dev/ttyAMA0 to ttyS1 which the Arduino environment recognises. I now have this working using an "Arduino clone" kit. This comprises an avr with modified boot loader running at 8 Mhz 3.3 Volts. I would like to get it ...
by robsbots
Tue Jan 08, 2013 6:01 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO serials pin problem
Replies: 8
Views: 3121

Re: GPIO serials pin problem

Will this work for Gertboard Arduino? So that I can write using /dev/ttyAMA0 instead of Gordon's Raspberry Pi GPIO? ..... Hi wallarug. I have not seen a Gertboard in the flesh yet, but I see no reason why it should not work. I believe the GertBoard currently uses the SPI interface to program the on...
by robsbots
Mon Jan 07, 2013 5:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO serials pin problem
Replies: 8
Views: 3121

Re: GPIO serials pin problem

I have got some code to download and run on the Arduino clone. :D After editing the /boot/commandline.txt file and the /etc/init.tab files, then creating a link in /dev to the correct port name, then adding users to groups I am now able to upload programs and monitor a 3.3v Arduino clone via the RPi...
by robsbots
Mon Jan 07, 2013 3:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO serials pin problem
Replies: 8
Views: 3121

Re: GPIO serials pin problem

Hi Joan Thanks for you reply. I may have managed to get the port listed ok. Not sure. I have managed to get a port listed in the Arduino IDE using the following command sudo ln /dev/ttyAMA0 /dev/ttyS1 This I assume links /dev/ttyAMA0 (the hardware uart GPIO8 and 10) with file /dev/ttyS1 (A port the ...
by robsbots
Mon Jan 07, 2013 1:49 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO serials pin problem
Replies: 8
Views: 3121

GPIO serials pin problem

Hi all. I am having a problem using the GPIO serial pins 8 and 10. I have read loads of posts but nothing seems to work for me. The Situation I have the Arduino ide installed. I have an Arduino uno connected via usb. I am able to access/program this Arduino I also have an ATmega328 with Arduino boot...
by robsbots
Mon Dec 17, 2012 3:55 am
Forum: Automation, sensing and robotics
Topic: connectors
Replies: 2
Views: 1055

Re: connectors

Hi Techpaul I'm in the east of England. My local store is Rapid Electronics in Colchester. They do have a small "shop" to wander round but most stuff is found on line or in the catalogue and picked for your order for delivery or collection. The "shop" is handy for spending extra cash when you get th...
by robsbots
Sat Dec 15, 2012 11:10 am
Forum: Graphics, sound and multimedia
Topic: HDMI cable hack
Replies: 2
Views: 2047

Re: HDMI cable hack

Good point, well made.

Sorry about that.

Try here instead. :oops:
by robsbots
Sat Dec 15, 2012 9:34 am
Forum: Graphics, sound and multimedia
Topic: HDMI cable hack
Replies: 2
Views: 2047

HDMI cable hack

If I try to search for HDMI on the forum it gets ignored. Not sure why, but I think I may have a hack that might be useful to people. I bought a non powered HDMI to vga cable from ebay. Then I read here that non powered cables tend to draw to much current though the diode on the Pi board. I have ope...
by robsbots
Wed Dec 12, 2012 5:38 pm
Forum: HATs and other add-ons
Topic: Gertboard kit
Replies: 11
Views: 4377

Re: Gertboard kit

I have put up a post on my own web site here :- Dream I/O board description
If any body is interested in helping develop the board or has any ideas for other items that should be included add a comment under the post and if the idea takes off we can get a board designed.

Thanks

Rob
by robsbots
Wed Dec 12, 2012 3:06 pm
Forum: HATs and other add-ons
Topic: Gertboard kit
Replies: 11
Views: 4377

Re: Gertboard kit

What about the two mayor things the PI is lacking for an industrial control setup. More than one PWM channels (in hardware), and A/D and D/A converters. Perhaps also a RTC, and an RS232 driver. Looking trough this forum I have come to the conclusion others have beat me to it. I'm not really sure th...
by robsbots
Mon Dec 10, 2012 6:20 pm
Forum: HATs and other add-ons
Topic: Gertboard kit
Replies: 11
Views: 4377

Re: Gertboard kit

Hi all. I have started designing a board and its moving away from the Gertboard, so rather than a 'knock-off' its becoming more of an 'inspired by'. So far I am planning on putting an Arduino clone on the board minus the usb connection. It will also have the connectors for Arduino shields. It has 2 ...
by robsbots
Mon Dec 10, 2012 10:20 am
Forum: HATs and other add-ons
Topic: Gertboard kit
Replies: 11
Views: 4377

Re: Gertboard kit

Thanks for your input guys. What I was thinking of was an official 'knock off' as it where. I was thinking about having a word with Gert van Loo and seeing if he would be interested in sharing his knowledge of the current board and possibly helping out do design a new V2 board. Maybe with a differen...
by robsbots
Sun Dec 09, 2012 12:42 pm
Forum: HATs and other add-ons
Topic: Gertboard kit
Replies: 11
Views: 4377

Gertboard kit

Hi all. Just been reading about the Gertboard kit fiasco. Is the Gertboard kit manufacture locked in to Newark/Farnell/Element14/who ever they are, or would it be possible to get them manufactured else where and stocked by a different retailer. Possibly for a slightly higher price. The prices I have...

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