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by MrBunsy
Fri Mar 08, 2013 4:59 pm
Forum: General discussion
Topic: RC communication?
Replies: 8
Views: 1442

Re: RC communication?

Any reason you'd not want to use Wifi? You've got a silly amount of overheads for doing anything simple, but usb wifi adapters can be dead cheap and very easy to set up.
by MrBunsy
Tue Jan 29, 2013 8:36 pm
Forum: General discussion
Topic: How to read data through USB
Replies: 21
Views: 25339

Re: How to read data through USB

If it's some sort of PIC board you're connecting to, USB is almost certainly over-the-top. I've not used PICs myself (I'm an AVR fan) but I would be surprised/worried if it didn't have some sort of UART or SPI interface. I've used Pi4J to very easily communicate over UART from the pi (example code: ...
by MrBunsy
Tue Jan 29, 2013 6:00 pm
Forum: Beginners
Topic: Longest Raspberry Pi uptime known?
Replies: 20
Views: 6339

Re: Longest Raspberry Pi uptime known?

03:36:22 up 124 days, 4:43, 1 user, load average: 0.26, 0.14, 0.08 Would've been longer but I made a backup of the SD card 124 days ago, apparently. I'm using it as a server so I don't make a habit of turning it off. I'm sure there must be other people who've had theirs up even longer. This is runn...
by MrBunsy
Sat Jan 26, 2013 12:34 pm
Forum: General discussion
Topic: How to read data through USB
Replies: 21
Views: 25339

Re: How to read data through USB

If your aim is to transfer data between Pis, would you not be better off with a more simple approach? You could link the Pi's UART ports, or use two USB->UART adapters, or even use a real network and communicate over that.
by MrBunsy
Sat Jan 19, 2013 6:18 pm
Forum: Beginners
Topic: Setting up SVN Server
Replies: 1
Views: 4806

Re: Setting up SVN Server

I've gone about this in two different ways in the past: Apache can host a subversion server over http(s). It was many years ago I set this up and I haven't got access to my notes atm, so I can't offer much more help. http://svnbook.red-bean.com/en/1.7/svn.serverconfig.httpd.html looks like it shows ...
by MrBunsy
Sun Jan 13, 2013 3:45 pm
Forum: Media centres
Topic: Raspberry Pi Spectrum Analyser
Replies: 10
Views: 7762

Re: Raspberry Pi Spectrum Analyser

A suggestion: You could use a fast Fourier transform ( FFT ) in software on the Pi, then use an LED driver to display what you want on the LEDs. The number of GPIOs won't be a problem - you can get serially-fed LED drivers where you shift in all the values you want, then enable the output, so 2 GPIO...
by MrBunsy
Sun Jan 13, 2013 1:48 pm
Forum: General discussion
Topic: software for clone
Replies: 5
Views: 1785

Re: software for clone

Have you tried simply zipping the 32gb img file? This isn't something I've tried, but it should compress extremely well.
by MrBunsy
Wed Jan 09, 2013 6:05 pm
Forum: Other projects
Topic: Control a Hornby Train Set With a Raspi
Replies: 11
Views: 5480

Re: Control a Hornby Train Set With a Raspi

Bog standard scalextrics or trains will just be a motor directly connected to the track, so varying the voltage across the track will vary the speed and direction. If you want to go the fancy route look into DCC ( http://en.wikipedia.org/wiki/Digital_Command_Control ) or its equivalents. I *think* I...
by MrBunsy
Mon Jan 07, 2013 7:08 pm
Forum: Networking and servers
Topic: Would it be wise to use the pi as a server for my site?
Replies: 3
Views: 1229

Re: Would it be wise to use the pi as a server for my site?

Provided it's nothing too bloated it should be fine, I've been running my website for several months from a Pi (using nginx + PHP fastcgi) and my home broadband connection. The limiting factor seems to be my upload speed, I shifted large images and larger content on the front page to be hosted with ...
by MrBunsy
Fri Jan 04, 2013 4:22 pm
Forum: Beginners
Topic: Using Pi with flatscreen monitor
Replies: 3
Views: 1252

Re: Using Pi with flatscreen monitor

Has your monitor got any settings to adjust horizontal and vertical position of the image? Or an auto-adjust? Usually that works as a quick and dirty way to line the image up.
by MrBunsy
Fri Jan 04, 2013 10:50 am
Forum: Beginners
Topic: Do sensors need resistors?
Replies: 5
Views: 1797

Re: Do sensors need resistors?

Looking at the datasheet for the TMP36 ( http://www.analog.com/static/imported-f ... _36_37.pdf ) it should be fine straight into the ADC.
by MrBunsy
Thu Jan 03, 2013 7:27 pm
Forum: Troubleshooting
Topic: Pi Shuts Off??
Replies: 4
Views: 714

Re: Pi Shuts Off??

Are you definitely using the latest firmware? I ran into what looked like heat problems with the very early firmware, but after updating had no problems at all.
by MrBunsy
Thu Jan 03, 2013 5:50 pm
Forum: General discussion
Topic: Plea for cheap battery PSU for Rpi Robot
Replies: 25
Views: 5655

Re: Plea for cheap battery PSU for Rpi Robot

richardp wrote:My question is to you really need a regulator when running from a battery?
Considering how many stability issues are resolved using a better quality power supply, I'd suspect that without good regulation you're just asking for trouble. But, I suppose it's worth a try.
by MrBunsy
Thu Jan 03, 2013 5:42 pm
Forum: Beginners
Topic: "Beginners" put off...
Replies: 297
Views: 37683

Re: "Beginners" put off...

What exactly of them doesn't work on the pi?
by MrBunsy
Thu Jan 03, 2013 11:55 am
Forum: General discussion
Topic: Plea for cheap battery PSU for Rpi Robot
Replies: 25
Views: 5655

Re: Plea for cheap battery PSU for Rpi Robot

The motors can easily stall and demand LOTS of current that would proabably cause any smallish capacity battery to dip the volts causing RPi failure. I need reliability as well (just to last for a 1 hour lesson though before needing recharging or new ones if using cheap AA/AAA. Hmm, I hadn't though...
by MrBunsy
Thu Jan 03, 2013 10:15 am
Forum: General discussion
Topic: Plea for cheap battery PSU for Rpi Robot
Replies: 25
Views: 5655

Re: Plea for cheap battery PSU for Rpi Robot

Why use two batteries? Why not one and just make sure the 5v is sufficiently regulated and decoupled? (throw capacitors at it). You should be able to regulate 6V down to 5v with a cheapish low dropout linear regulator. Linear regulation isn't efficient at all, but at a drop of only a volt you won't ...
by MrBunsy
Thu Jan 03, 2013 10:01 am
Forum: General discussion
Topic: Running Raspberry Pi 24/7
Replies: 6
Views: 1979

Re: Running Raspberry Pi 24/7

Code: Select all

uptime
 19:39:32 up 97 days, 20:46,  2 users,  load average: 0.08, 0.03, 0.05
 
8-)
Would be longer but I moved house :P
by MrBunsy
Thu Jan 03, 2013 10:00 am
Forum: Advanced users
Topic: Can somebody explain how to program an AVR with Raspberry Pi
Replies: 13
Views: 5501

Re: Can somebody explain how to program an AVR with Raspberr

I've found a better one - http://blog.stevemarple.co.uk/2012/07/avrarduino-isp-programmer-using.html Although I personally wouldn't bother with the buffer, provided you're careful and always check your wiring before turning anything on. I've not programmed an AVR from a Pi before so I couldn't give ...
by MrBunsy
Wed Jan 02, 2013 11:46 pm
Forum: Advanced users
Topic: Can somebody explain how to program an AVR with Raspberry Pi
Replies: 13
Views: 5501

Re: Can somebody explain how to program an AVR with Raspberr

That thread gives instructions on how to use the Raspberry Pi itself as an AVR programmer, using the GPIO, for the Gertboard. There's no reason why the same instructions couldn't be re-used to programme any old AVR, so long as you connect up the right pins. Alternatively you could go down the more c...
by MrBunsy
Wed Jan 02, 2013 3:02 pm
Forum: General discussion
Topic: an old chestnut ..... bbc iplayer proxy?
Replies: 8
Views: 4538

Re: an old chestnut ..... bbc iplayer proxy?

Simply allowing SSH access is enough. You can proxy through an SSH connection easily enough - for example on Windows: http://www.techrepublic.com/blog/security/use-putty-as-a-secure-proxy-on-windows/421 I've done this and it works very easily, only real setting up is to forward a port to the Pi. I c...
by MrBunsy
Sat Dec 15, 2012 1:19 pm
Forum: General discussion
Topic: Powering the Pi from the GPIO pins
Replies: 8
Views: 1344

Re: Powering the Pi from the GPIO pins

Likewise, I'm powering a Pi with a 12V lead acid and a DC-DC converter (+ some decoupling capacitors) straight to the GPIO. I have also previously powered it from AAs + a linear regulator. So far so good!
by MrBunsy
Sun Dec 02, 2012 7:44 pm
Forum: Debian
Topic: Distributing an img file
Replies: 7
Views: 1449

Re: Distributing an img file

Bittorrent is perfect for this sort of thing.
by MrBunsy
Tue Nov 27, 2012 6:21 pm
Forum: Off topic discussion
Topic: Raspberry PI Running on 48Gb RAM
Replies: 39
Views: 13848

Re: Raspberry PI Running on 48Gb RAM

NigelJK wrote:Have a look at the RiscOS forum, 512megs is massive! If the software you're running is bloated (for no apparent reason other than to sell more ram) then I'd suggest it's the software that is at fault.
Hardware is cheap, good programmers are expensive :P
by MrBunsy
Sun Nov 25, 2012 7:41 pm
Forum: Off topic discussion
Topic: Raspberry PI Running on 48Gb RAM
Replies: 39
Views: 13848

Re: Raspberry PI Running on 48Gb RAM

You could add 'RAM' via usb, it's just next to useless as it's too slow. It'd basically be more swap space.

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