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by Hugh Reynolds
Thu Dec 15, 2011 2:29 pm
Forum: Off topic discussion
Topic: Where did you stick it ?
Replies: 22
Views: 4807

Re: Where did you stick it ?

I thought all Rovers were 4x4.
(Note to Design Team: Must add ultrasonic communicator. Include 'Come by', 'Away to me' and 'Get back' protocols. 'Woof' suppression might be important.)
by Hugh Reynolds
Thu Dec 15, 2011 2:11 pm
Forum: Other projects
Topic: Break out board (GPIO, SPI, I2C, and UART)
Replies: 189
Views: 46057

Re: Break out board (GPIO, SPI, I2C, and UART)

Bated breath...
by Hugh Reynolds
Thu Dec 15, 2011 2:10 pm
Forum: Off topic discussion
Topic: Where did you stick it ?
Replies: 22
Views: 4807

Re: Where did you stick it ?

<t>Just thought of a new use for the Pi...autonomous robot cat scarer.<br/> Perhaps I can get that quadcopter hooked up...might be able to derive a bit of HT from a extra winding on the motor and Bernadettes your Aunt (Bobs your Uncle) TazerPowerAutonomousCatScopter.<br/> Travels to target, floats d...
by Hugh Reynolds
Thu Dec 15, 2011 1:18 pm
Forum: General discussion
Topic: Proposal: Industrial Design competition?
Replies: 11
Views: 2216

Re: Proposal: Industrial Design competition?

Wizzy wizzy wizzy.
Style over functionality and no though of cost.
I'm just a utilitarian punter and while this might win a competition judged by Tracey Emin it........ooh I can't be bothered to finish.
Keep going though; this is the season for fun. :? :?
by Hugh Reynolds
Tue Dec 13, 2011 1:47 pm
Forum: Staffroom, classroom and projects
Topic: Teaching Real-time Systems
Replies: 14
Views: 6671

Re: Teaching Real-time Systems

<t>The only thing missing is a clearly defined method of getting an interrupt into the system. If you don't need interrupts it is not a reattime system IMHO.<br/> <br/> It may have been here on the forum that I read that all GPIOs can generate interrupts but as we have so little info on the GPIO, I2...
by Hugh Reynolds
Thu Dec 08, 2011 8:32 pm
Forum: Off topic discussion
Topic: Its Gone Awfully Quiet...
Replies: 80
Views: 7902

Re: Its Gone Awfully Quiet...

<r>Clearly Illinois has good representation....and high taxes.<br/> Liz probably has Woman Flu. <E>:-)</E> Get well soon. All Santa's helpers are wanted with nimble packing fingers ASAP. Mind you our Postie has already been reduced to one delivery every other day. Don't know if that is by weight of ...
by Hugh Reynolds
Wed Dec 07, 2011 10:17 am
Forum: Staffroom, classroom and projects
Topic: Lessons in PCB Design
Replies: 35
Views: 10272

Re: Lessons in PCB Design

<r>FD - <URL url="http://en.wikipedia.org/wiki/F.....ary_marker">http://en.wikipedia.org/wiki/F.....ary_marker</URL><br/> <br/> Used by the robots to optically calibrate their alignment with the board, thereby making sure they put the components in the correct locations to within 0.1mm or so.<br/> T...
by Hugh Reynolds
Wed Dec 07, 2011 9:30 am
Forum: Staffroom, classroom and projects
Topic: Lessons in PCB Design
Replies: 35
Views: 10272

Re: Lessons in PCB Design

<t>Those missing BGA pads intrigued me too. I've never seen that done. One possible downside is the ball of solder on the bottom of the BGA would migrate, be squashed, or in some other way be persuaded to couple with either the next adjacent ball. pad or via. I guess because the solder ball is so sm...
by Hugh Reynolds
Tue Dec 06, 2011 4:50 pm
Forum: Staffroom, classroom and projects
Topic: Lessons in PCB Design
Replies: 35
Views: 10272

Re: Lessons in PCB Design

Liz, fear not:
The suspect Wiki is not the RaspberryPi Wiki but that strange Wikipedia thing.
by Hugh Reynolds
Tue Dec 06, 2011 4:46 pm
Forum: Staffroom, classroom and projects
Topic: Lessons in PCB Design
Replies: 35
Views: 10272

Re: Lessons in PCB Design

<r>@Bacan <E>:-)</E> Just to bore the software types.<br/> <br/> The WIKI on differential signalling is not that good. It states:<br/> "Suitability for use with low-voltage electronics<br/> In the electronics industry, and particularly in portable and mobile devices, there is a continuing tendency t...
by Hugh Reynolds
Tue Dec 06, 2011 3:50 pm
Forum: Staffroom, classroom and projects
Topic: Lessons in PCB Design
Replies: 35
Views: 10272

Re: Lessons in PCB Design

<r>Those traces are "differntial pairs". Carrying a single digital 0 or 1. By using differential pairs very high frequency signalling can be acheived while staying within a power budget. The ones connected to the HDMI connector are very obvious.<br/> The wavy tracking keeps the track lengths for eac...

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