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by mattvenn
Thu Jun 26, 2014 2:12 pm
Forum: Advanced users
Topic: Portable Power Solutions
Replies: 21
Views: 30850

Re: Portable Power Solutions

I just did a tear down and test of a tecknet 3300mAh usb power pack: https://github.com/mattvenn/tecknet
With a Raspberry Pi model B it lasts for about 6 hours.
by mattvenn
Tue Apr 01, 2014 9:30 am
Forum: Beginners
Topic: Can the RPi be powered by 3.3V only?
Replies: 17
Views: 2561

Re: Can the RPi be powered by 3.3V only?

I can confirm that putting 3.3 and 5v into the pi works.
by mattvenn
Tue Mar 18, 2014 10:40 am
Forum: C/C++
Topic: Building opencv is failing with a make error
Replies: 11
Views: 11177

Re: Building opencv is failing with a make error

It was failing for me with an internal compiler error. It was because memory had run out. I switched to a 512MB pi and changed the gpu mem share and that fixed it.
Matt
by mattvenn
Mon Oct 07, 2013 5:10 pm
Forum: Troubleshooting
Topic: mpd mpc - BBC radio internet streams stopped
Replies: 16
Views: 13108

Re: mpd mpc - BBC radio internet streams stopped

I've made a variation of your script - it's slightly more python centric, and creates a new playlist for each of the radio stations as that seems to work better for me (I can add each station individually rather than all at once). import requests plsdir = "/home/music/playlists/" #set the directory ...
by mattvenn
Tue Sep 10, 2013 5:03 pm
Forum: Teaching and learning resources
Topic: scratch to python cheat sheet?
Replies: 2
Views: 2253

Re: scratch to python cheat sheet?

hope this is useful for someone!
http://bit.ly/scrpy
by mattvenn
Mon Sep 09, 2013 5:44 pm
Forum: Teaching and learning resources
Topic: scratch to python cheat sheet?
Replies: 2
Views: 2253

scratch to python cheat sheet?

Wondering if anyone has seen this?
A picture that shows how each colour/shape scratch module relates to a class of python keywords/functions.

I think it would be a great resource for KS2 teachers wanting to show scratch enabled kids how to do the same thing in python...
by mattvenn
Mon Jul 01, 2013 2:43 pm
Forum: Advanced users
Topic: Is GPIO linux serial terminal enabled by default?
Replies: 2
Views: 985

Re: Is GPIO linux serial terminal enabled by default?

Yes by default it is. And when the pi boots up it will print all the boot messages to the serial out.
There is loads of good info here: http://elinux.org/RPi_Serial_Connection

Good luck!
by mattvenn
Sun Jun 30, 2013 11:18 am
Forum: Teaching and learning resources
Topic: game to learn python/linux
Replies: 0
Views: 1114

game to learn python/linux

Hi all, I once played an online hacking game to learn about security. It was really good fun, you started with a clue and after successfully taking advantage of a weak point in the system (hosted online) you got the next clue. It started off easy but by the end it was buffer overflow to make root sh...
by mattvenn
Thu May 09, 2013 9:56 pm
Forum: Scratch
Topic: Scratch connectivity
Replies: 21
Views: 13943

Re: Scratch connectivity

Thanks Si, it turned out to be my vnc client. I also tried x11vnc, but in the end I've stuck with tightvnc on the pi as it seems a bit easier for me to run headless. Now I've got a wireless raspberry pi drawing robot buggy that I program from scratch via VNC on another computer! http://www.flickr.co...
by mattvenn
Thu May 09, 2013 9:53 pm
Forum: Troubleshooting
Topic: shift click over vnc
Replies: 1
Views: 371

Re: shift click over vnc

This turned out to be a vnc client issue. The tightvnc client on linux doesn't send a shift click properly.
Remmina worked a treat. http://remmina.sourceforge.net/
by mattvenn
Thu May 09, 2013 9:51 pm
Forum: User groups and events
Topic: looking for workshop assistant on 13th, 14th May in London
Replies: 2
Views: 734

Re: looking for workshop assistant on 13th, 14th May in Lond

Thanks for all the interest, we've now found someone, but if people are still interested then PM me with your details.
by mattvenn
Thu May 09, 2013 2:20 pm
Forum: User groups and events
Topic: looking for workshop assistant on 13th, 14th May in London
Replies: 2
Views: 734

looking for workshop assistant on 13th, 14th May in London

Late notice I know, but...

I'm looking for someone to help me run a couple of raspberry pi workshops in London. They're for teachers, with up to 12 people per day.

We can pay £150 plus expenses.

Thanks!

Matt
by mattvenn
Mon May 06, 2013 5:06 pm
Forum: Troubleshooting
Topic: shift click over vnc
Replies: 1
Views: 371

shift click over vnc

Hi all, I've run into a problem trying to get scratch working with the piface. I need to shift click on scratch, but this isn't handled over my vnc connection (tightvncserver). It works fine with x forwarding, but then it's too slow. Anyone got any clues about how to send a shift click over vnc? Or ...
by mattvenn
Mon May 06, 2013 5:04 pm
Forum: Scratch
Topic: Scratch connectivity
Replies: 21
Views: 13943

Re: Scratch connectivity

Hi, I've found the guide quite useful for getting setup with scratch & piface on the pi. However, I'm really struggling with shift clicking anything over vnc. I need this to turn on mesh.

Anyone manage it?
by mattvenn
Fri Mar 22, 2013 7:34 pm
Forum: Python
Topic: Crosspost, New: Pulse-width modulation with RPIO.PWM
Replies: 5
Views: 6385

Re: Crosspost, New: Pulse-width modulation with RPIO.PWM

excellent!!! Worked no problems on the only pin I tried it on.
I'll be using this in my upcoming workshops.
by mattvenn
Wed Feb 27, 2013 5:40 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

Re: blank the screen

cracked it! 1/- set kernel to log to console 2 (console=tty2 in /boot/cmdline.txt) 2/- wipe screen with dd if=/dev/zero of=/dev/fb0 3/- turn off cursor with setterm -cursor off > /dev/tty1 Then I can play my movie whenever I get the trigger, and have a nice blank screen before and after, no flickers...
by mattvenn
Wed Feb 27, 2013 5:33 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

Re: blank the screen

I set the console to be tty2 in /boot/cmdline.txt and that's one way to solve it.
Last thing would be nice to get rid of the flashing cursor!
by mattvenn
Wed Feb 27, 2013 5:16 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

Re: blank the screen

I'm wanting to have a blank screen, and when something happens, a video plays. When the video ends, back to blank screen. I nearly have that, but with short flashes of boot messages in the back ground. pseudo code: while forever: if something happens: blank screen play movie blank screen The flashes...
by mattvenn
Wed Feb 27, 2013 4:52 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

Re: blank the screen

though after the video finishes playing, the old text is still there!
by mattvenn
Wed Feb 27, 2013 4:44 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

Re: blank the screen

after messing about with inittab, getty, fim, fbi I found the easy way to blank the screen: write zeros to the frame buffer directly.

dd if=/dev/zero of=/dev/fb0
by mattvenn
Wed Feb 27, 2013 4:30 pm
Forum: Beginners
Topic: View Image without XServer
Replies: 6
Views: 17205

Re: View Image without XServer

any luck with that pretty picture?
by mattvenn
Wed Feb 27, 2013 3:53 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

Re: blank the screen

thanks, but that only works for the screen I type it in. I need to blank the composite output. I think this is displaying tty1 from /etc/initab: 1:2345:respawn:/sbin/getty --noclear 38400 tty1 I haven't tried removing the getty lines from inittab yet, but it probably wouldn't help with blanking the ...
by mattvenn
Wed Feb 27, 2013 3:26 pm
Forum: Beginners
Topic: blank the screen
Replies: 9
Views: 7695

blank the screen

Hi,

I'm running with a composite tv on the pi. After boot, I want to wipe the screen of all the messages and the login prompt.

When I play a video, it plays fine, but after it finishes, all the messages and boot prompt are still there.

Any help appreciated!

Matt
by mattvenn
Wed Jul 25, 2012 9:59 am
Forum: Arch
Topic: Mirrors?
Replies: 3
Views: 1134

Re: Mirrors?

thanks, this helped me fix the 404s

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