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by exartemarte
Sat Apr 14, 2012 9:29 am
Forum: General discussion
Topic: My Pi Has Shipped!
Replies: 75
Views: 15501

Re: My Pi Has Shipped!

<t>Andre_P said: <br/> <br/> <br/> While the entire team have had to show the courage of Boadicea, the fortitude of Elizabeth I and the steelyness of Margaret Thatcher they have yet to reach deity status ...<br/> <br/> <br/> <br/> <br/> Any indication as to when this might happen? We should be kept ...
by exartemarte
Thu Apr 12, 2012 10:31 pm
Forum: Off topic discussion
Topic: Robotics platform; build or buy? and motors or servos?
Replies: 13
Views: 4802

Re: Robotics platform; build or buy? and motors or servos?

<t>SN said: <br/> <br/> <br/> this is why you can blow the windscreen washer fuse on your car if the pipes/nozzles are frozen when you try to use them (I think) - been there, done that, swapped a 10A for 20A fuse and all is OK now <br/> <br/> <br/> <br/> Hmmm...<br/> <br/> While serving Her Majesty,...
by exartemarte
Thu Apr 12, 2012 4:55 pm
Forum: Off topic discussion
Topic: Robotics platform; build or buy? and motors or servos?
Replies: 13
Views: 4802

Re: Robotics platform; build or buy? and motors or servos?

<t>zedin said: <br/> <br/> <br/> exartemarte said: <br/> <br/> <br/> <br/> With all of this set up correctly you will have independent pwm control of both motors - make sure the motor driver can handle the motor stall current.<br/> <br/> <br/> Without sounding dumb.. (trying to read up on all this b...
by exartemarte
Thu Apr 12, 2012 4:34 pm
Forum: Off topic discussion
Topic: Robotics platform; build or buy? and motors or servos?
Replies: 13
Views: 4802

Re: Robotics platform; build or buy? and motors or servos?

<t>Continuous servos have their adherents - they're easy to use and don't need a separate motor driver - but they're limited to quite small robots. My preference is for geared dc motors.<br/> <br/> The chassis you've linked to looks nice, but for a first mobile robot I would pick something cheaper, ...
by exartemarte
Wed Apr 11, 2012 9:26 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 439
Views: 168342

Re: What was your first computer?

<t>Jongoleur said: <br/> <br/> <br/> exartemarte said: <br/> <br/> <br/> <br/> ... This was about 1978/9 and the course was TM221: The Digital Computer.<br/> <br/> <br/> <br/> By 1984ish the OU had upgraded "The Digital Computer" to TM222 and issued an 8085 based micro called Hektor II to go with it...
by exartemarte
Wed Apr 11, 2012 3:26 pm
Forum: Off topic discussion
Topic: Intel 8086 CPU
Replies: 35
Views: 11922

Re: Intel 8086 CPU

Loved the 68K series, which I used as recently as the 90s for teaching Microprocessor Systems.

I learned low-level programming on Z80s and 6502s. By comparison the 68000s had a neat, flexible architecture and a straightforward, logical instruction set.
by exartemarte
Wed Apr 11, 2012 3:09 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 439
Views: 168342

Re: What was your first computer?

<t>Jongoleur said: <br/> <br/> <br/> exartemarte said: <br/> <br/> <br/> mahjongg said: <br/> <br/> <br/> ... I had been building one from scratch, but never progressed beyond building the memory system, (512 bytes) which I could load with a bunch of toggle switches, and read out with LED"s.<br/> <b...
by exartemarte
Tue Apr 10, 2012 10:43 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 439
Views: 168342

Re: What was your first computer?

mahjongg said: ... I had been building one from scratch, but never progressed beyond building the memory system, (512 bytes) which I could load with a bunch of toggle switches, and read out with LED"s. Eons ago I had an Open University computer like that! It had no operating system at all and no non...
by exartemarte
Thu Mar 22, 2012 10:43 pm
Forum: Python
Topic: Python Hello World :)
Replies: 17
Views: 5074

Re: Python Hello World :)

When I was at school, everyone knew that pi was 3.1416 - which was what you had to look up in the log tables to use it in calculations. When I first studied engineering, and had to use five-figure logs, I felt quite smug about knowing that pi was really 3.14159 ...
by exartemarte
Thu Mar 22, 2012 10:25 pm
Forum: Off topic discussion
Topic: Suggestions for learning electronics/robotics?
Replies: 39
Views: 5428

Re: Suggestions for learning electronics/robotics?

<t>SN said: <br/> <br/> <br/> When I started work at 18 at ICL (remember them?) in 1983 as an A Level Trainee the first four weeks were spent in the Wiring School (yes we had a wiring school)<br/> <br/> <br/> When I was moonlighting as a patrolman for Securicor in the early 70s one of the clients wa...
by exartemarte
Thu Mar 22, 2012 10:10 pm
Forum: Off topic discussion
Topic: Suggestions for learning electronics/robotics?
Replies: 39
Views: 5428

Re: Suggestions for learning electronics/robotics?

<t>zedin said: <br/> <br/> <br/> I had a question on that.. the old soldering iron I have is a fixed 40W weller.  Do you think for doing circuit board type stuff that is too high?  Should I get a adjustable?  And what are guidelines on what temp to use for what you are doing?  Been doing some search...
by exartemarte
Thu Mar 22, 2012 10:01 am
Forum: Python
Topic: Python Hello World :)
Replies: 17
Views: 5074

Re: Python Hello World :)

And of course we had books in which we could look up the value of pi, or other necessary constants, to the required level of accuracy.
by exartemarte
Thu Mar 22, 2012 9:55 am
Forum: Python
Topic: Python Hello World :)
Replies: 17
Views: 5074

Re: Python Hello World :)

<t>Jongoleur said: <br/> <br/> <br/> Ok – who else approximates Pi by doing 22/7 ??????   <br/> <br/> <br/> <br/> There's a blast from the past! It was a useful form in the pre-calculator days if you were working with pencil paper; if you used a slide rule then you didn't need it because pi was mark...
by exartemarte
Tue Mar 20, 2012 11:01 pm
Forum: Off topic discussion
Topic: Suggestions for learning electronics/robotics?
Replies: 39
Views: 5428

Re: Suggestions for learning electronics/robotics?

<t>This has been an interesting thread, and hopefully of some help to zedin who posted the original query.<br/> <br/> I've been less than enthusiastic about Arduinos since I first looked them up when they were new, and was irritated by the obfuscatory terminology. However, after reading the posts in...
by exartemarte
Tue Mar 20, 2012 10:35 am
Forum: Off topic discussion
Topic: Suggestions for learning electronics/robotics?
Replies: 39
Views: 5428

Re: Suggestions for learning electronics/robotics?

Lakes said:


Nice site for beginners.

http://www.kpsec.freeuk.com/index.htm


What he said...
by exartemarte
Tue Mar 20, 2012 10:33 am
Forum: Off topic discussion
Topic: Suggestions for learning electronics/robotics?
Replies: 39
Views: 5428

Re: Suggestions for learning electronics/robotics?

<t>I wouldn't take issue with anything that MG2R has said above. Essentially we're suggesting the same approach: buy a module and a breadboard, and get going. I can't personally recommend Arduino since I've never used it myself, but the Nano which MG2R suggests is a self-contained module that you ca...
by exartemarte
Tue Mar 20, 2012 1:52 am
Forum: Off topic discussion
Topic: Suggestions for learning electronics/robotics?
Replies: 39
Views: 5428

Re: Suggestions for learning electronics/robotics?

<t>Certainly start with the first item on Golem's reading list, and then read anything and everything you can find on the web about robotic projects at a suitably introductory level. You will find that common themes start to emerge and you will gain an overview that will help a lot - when you have a...
by exartemarte
Fri Mar 16, 2012 11:45 am
Forum: Off topic discussion
Topic: Ordered something else to fill the time
Replies: 65
Views: 14891

Re: Ordered something else to fill the time

<t>Well, right now I'm happily trying to get a Picaxe to talk to an AVR – a trivial matter on the face of it, but with serial comms nothing is ever quite as simple as it seems. This is part of a small mobile robot project – one of several – which serves no useful purpose other than to keep me entert...
by exartemarte
Wed Mar 14, 2012 12:52 am
Forum: Off topic discussion
Topic: One Dollar Computer's Future
Replies: 6
Views: 1791

Re: One Dollar Computer's Future

<t>In 1980 my Nascom 2 kit cost £295, which was a lot - and that was kit as in bare pcb and bag of ICs, transistors, etc, to be soldered in. And for that price you didn't get a case, a monitor or even a power supply. Sound familiar?<br/> <br/> It was a great machine, though, and it started me on a p...
by exartemarte
Sat Mar 10, 2012 11:33 pm
Forum: Off topic discussion
Topic: Disgusted - Price Hike by Farnell
Replies: 65
Views: 16657

Re: Disgusted - Price Hike by Farnell

Please don't shout.
by exartemarte
Fri Mar 09, 2012 11:14 am
Forum: Off topic discussion
Topic: Disgusted - Price Hike by Farnell
Replies: 65
Views: 16657

Re: Disgusted - Price Hike by Farnell

<t>I think you're right. The only thing that should vary significantly from country to country within the EU is the locally imposed rate of VAT (20% here in the UK).<br/> <br/> But if you're ordering from another EU country the postage/freight charges will be higher, as I know through regularly orde...
by exartemarte
Mon Mar 05, 2012 9:22 am
Forum: Off topic discussion
Topic: Disgusted - Price Hike by Farnell
Replies: 65
Views: 16657

Re: Disgusted - Price Hike by Farnell

<t>I have huge sympathy for the foundation, who seem to have been caught between a rock and a hard place.<br/> <br/> I understand they had expected to manufacture, and presumably distribute, the device themselves but were limited by their finances to ordering batches of 10,000. They seem to have rea...
by exartemarte
Sat Mar 03, 2012 4:18 pm
Forum: Off topic discussion
Topic: Disgusted - Price Hike by Farnell
Replies: 65
Views: 16657

Re: Disgusted - Price Hike by Farnell

<t>I deal with Farnell - you get next day delivery as standard and the cost is included in the price - there's no separate delivery charge.<br/> <br/> My order shows the price before tax as £24.55, so if you were expecting £22.00 then Farnell has added £2.55. That's pretty good these days for next d...

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