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by Condemned
Sun Oct 28, 2012 6:33 pm
Forum: Beginners
Topic: Max Number of Push Buttons?
Replies: 5
Views: 3112

Re: Max Number of Push Buttons?

If you're happy adding a diode to each switch, then you can use charlieplexing to read push buttons. This allows (n^2)-n switches for n pins. It does have downsides (code-complexity, extra parts [diodes], scanning time), but would allow, in theory, 272 switches from the 17 I/O pins. 25 buttons shoul...
by Condemned
Tue Jul 17, 2012 3:00 pm
Forum: Other projects
Topic: Prototype 1" Serial Terminal
Replies: 2
Views: 3949

Re: Prototype 1" Serial Terminal

Yup, it's an XProtolab board (a great little board), running my own firmware.
I had been running it on one of my own XMega AV boards (with 40x25 characters) until recently, outputting the text as a composite TV signal, but that's a little redundant with a Raspberry Pi :D
by Condemned
Tue Jul 17, 2012 1:56 pm
Forum: Other projects
Topic: Prototype 1" Serial Terminal
Replies: 2
Views: 3949

Prototype 1" Serial Terminal

I've been writing a terminal emulator (VT100 ish ) for Atmel XMegas, and have just started using a 1" wide 128x64 OLED screen as the output. Here's a picture of it frankensteined to my Raspberry Pi, showing the boot output. (click for bigger) http://www.batsocks.co.uk/img/XMega/Term_ProtoPi_400.jpg ...
by Condemned
Thu Jun 21, 2012 10:46 am
Forum: General discussion
Topic: List of games for Raspberry Pi
Replies: 39
Views: 18796

Re: List of games for Raspberry Pi

nethack works fine ;-p I've installed Angband: sudo apt-get install angband The 'SDL' front end (?) for it seems to run very quickly in the debian/raspbian desktop. I launch it from an LXTerminal window using: angband -msdl -uCharacterName My children (7 & 9) are hooked, and interest hasn't waned f...
by Condemned
Sat Apr 14, 2012 8:21 pm
Forum: Off topic discussion
Topic: Geek, nerd or boffin?
Replies: 29
Views: 6234

Re: Geek, nerd or boffin?

Gnoffin?
by Condemned
Tue Apr 03, 2012 7:40 am
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4315

Re: Deltaboard: a small AVR-based expansion board for the Pi

<t>The following questions are not complaints! It's great to see stuff like this.<br/> <br/> Why a mini USB connector?! Surely the whole world is going micro.<br/> <br/> Why not use a smaller (cheaper) XMega32A4U? It has 34 I/O lines. Or is there a specific application you're looking at that needs m...
by Condemned
Sun Jan 22, 2012 7:03 pm
Forum: Staffroom, classroom and projects
Topic: composite resolution too low to be of use for programming?
Replies: 62
Views: 23275

Re: composite resolution too low to be of use for programming?

<t>For PAL (and probably NTSC too) there's a portion of the 'visible' video signal that's considered 'text safe' and will be visible on all TVs. For 4:3 SD TV, the BBC used to use the centre 80% width and 80% height as 'text safe' for captions, titles etc.<br/> <br/> Vertically, this works out as th...
by Condemned
Tue Jan 03, 2012 12:47 am
Forum: Off topic discussion
Topic: Soldering iron recommendations
Replies: 44
Views: 17834

Re: Soldering iron recommendations

<t>You can solder anything if you get the flux right! I have some liquid flux in a small needle-tipped dispensing bottle and use it whenever I rework a joint.<br/> <br/> I use a £20 iron from Maplin which came with 4 tips. It'll comfortably solder through-hole stuff and with a little practice, 0603 ...

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