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451  Community / Bar Sport / Re: Shirt Idea for Arduino Lovers on: May 02, 2014, 10:28:40 pm
... Inside?   smiley-razz  I think I'll reserve that for qualified service personnel only.
I've an implanted pacemaker and I'd not want any of you folks, however good you are at wielding a soldering iron, anywhere near it.   smiley-roll-sweat
452  Community / Local Groups / Re: Online Group/Community on: May 02, 2014, 10:00:49 pm
No thanks. There are too many spelling errors and too many links that turn out to be adverts for unconnected items. It doesn't give one confidence in the contents.
453  Using Arduino / Programming Questions / Re: Interrupt function help on: May 02, 2014, 08:29:38 pm
What about a series of beams such that a large coin covers all of them at the same time and a small coin only covers one or two of them.
The beams would have to be very thin and accurate to differentiate between a 18mm 5p and a 20mm 1p. Lasers shining through 1mm wide slots would probably be the only way it would work. To avoid interference between the beams, I would stagger the beams along the coin's path so that the largest coin is detected first, smaller ones wouldn't break it, then lower and lower beams to detect smaller and smaller coins. The first beam broken will give the size of the coin. Subsequent broken beams can be ignored.
454  Using Arduino / Project Guidance / Re: I'm in desperate need of help for my eksamensprojekt on: May 02, 2014, 07:38:18 pm
That way you verify that you get all the little pieces to work before you attempt to put it all into the final solution.
This is the only way to make progress - even if you are an expert.
+ another 1. And that way, you learn by your (small) mistakes as you go along.
455  Using Arduino / General Electronics / Re: Multiple relays in parallel with rectifying diodes on: May 01, 2014, 11:05:36 pm
I'm trying to switch 4 relays simultaneously with arduino. Essentially, I have these relays' coils connected in parallel. I tried connecting them with every relay having its own rectifying diode and it works just fine. The question is, is it necessary to have a diode on each of the relays, or can I use one (maybe larger) diode for the whole lot?
Yes you can.
How do I select it (assuming it is possible)?
Depends on the relays. What diodes are you using now?
456  Using Arduino / Programming Questions / Re: CANT UNDERSTAND SAMPLE CODE !!!! HELP PLEASE! on: May 01, 2014, 10:52:31 pm
Why are you SHOUTING?
Where are your code tags?
457  Using Arduino / Programming Questions / Re: Interrupt function help on: May 01, 2014, 10:46:24 pm
You may be able to detect the difference between a 1p (20mm) and a 2p (25mm) with this method, but I think you'll find it almost impossible to accurately detect the difference between a 1p (20mm) and a 5p (18mm). Also, have you taken into account the friction between the (possibly dirty) coin and the slot not always being the same, making the speed of the coin variable? I believe that commercial coin counters use a series of slots (smallest first) that the coin can fall through. Obviously, a 20mm or 25mm coin will not fall through an 19mm slot, but an 18mm coin will. The slots also vary in width so as to not allow thicker coins (Eg the £1 coin) to pass through the narrower slots. Using the slot method automatically sorts your coins into tubes of one value, which can then be used for dispensing change.
458  Using Arduino / Programming Questions / Re: Input switching.......warning, newb. on: May 01, 2014, 09:44:53 pm
Hello, does anyone know how I can turn an input into a non constant, i.e. i want basically a limit witch on a motor to work as an input.
Analog or digital? In other words, do you just want to detect when the motor reaches the limit of travel or do you want to know how far the motor has turned?
459  Using Arduino / Programming Questions / Re: Timing problems and Keypad interface on: May 01, 2014, 12:32:02 am
while (loopCount >= 0 && DoWhile);
What is that supposed to do?
It's the end of a do/while statement - another reason to hate them.
I never use them. That's why I didn't recognise it. It just looked like the beginning of a while loop, but with nothing inside it.
460  Using Arduino / Project Guidance / Re: New to Arduino, Have what might be an over ambitious project NEED HELP! on: April 30, 2014, 11:47:26 pm
The cycle(from my own use) tops out at about 10 seconds on, 50 seconds off.  Also, the way I'm planning the system, each user will have their own coil and tank.
That's hardly in the spirit of a hookah.
That way each can have their preferred flavor and nicotine content.  This lowers the chance of overheating the coils as well.
Not if each has their own coil but they all use a common tank.
Thank you for the Ohm's law calculation.  I'm sure there's somewhere on the "interwebs" I could have gotten that, but I'm terrible at math and a touch lazy.  I'm assuming that's the "cold" resistance, as well.
If you're using an 1100mAh battery and each 'puff' is 10 seconds then we can do a calculation (more like an approximation) to see how long the battery will last.
10 seconds is 1/6th of a minute and is 1/360th of an hour.
You can expect to get about 1/2 the charge out of the battery before it needs recharging, so you've got about 550mAh to play with. 2A/360Hrs is about 5.5mAh so you should get about 100 'puffs' from each charge. I don't know if that's within your range of 'usability'.
I've considered wall power, but two things make me think batteries first:
1:  I have no idea how I'd do that.  If you happen to know and would like to throw that info my way when the time comes, I wouldn't scoff...
2:  There is a good chance this will become a "display item" for taking to bars(pubs for my new English friend) and showing off.  I can't see them being too keen on me running experimental electronics from their wall source.  Ideally, being able to switch between battery and wall power would be totally brilliant.
I'm sure that could be done.
As far as the "vapor condensing" issue, I'm running experiments now on how long the tube can be before that becomes an issue.  Luckily, I have many friends who indulged in "less than legal" recreation in their youths(unlike me, who never even drinks), so there is some backroom expertise on that sort of thing close at hand.  I'm hearing that if the tube is narrow enough, I should be able to get a comfortable length without condensation.
But too narrow a tube will make it hard to draw.
I will be experimenting with all of this as time goes on, and hope to pick up my Arduino Mega end of this week, beginning of next.  That leads me to another question:  If I get all of this to work well, I'm hoping to make it a permanent system, how hard would it be to replace the Mega in the circuit with a Mini or Nano?  Would it be a total rewrite of the program, a simple upload, or somewhere in between?
Depending on the size of your code, it would probably be possible. As for the rewrite, probably 'somewhere in between.'  smiley
P.S. for Henry,
I successfully fought the urge to use every last bit of rhyming slang I know in this post.
I'm a Londoner born and bred, but not from the East End, so I'm not a Cockney. Rhyming slang is not my 'native tongue', but I understand some, although I'm not fluent.
461  Using Arduino / Project Guidance / Re: Arduino uno smd R3 interface problem does on: April 30, 2014, 10:58:08 pm
I'm using it on windows XP it is plugged in once the computer has been booted up on the start screen IDE version used have been 1.0.3 1.0.5 problem with both. 
Thanks for your reply
Try plugging the board in before you boot up the computer. That way, windows is more likely to find it.
462  Using Arduino / Project Guidance / Re: Arduino & Video? on: April 30, 2014, 10:29:54 pm
There's also a version that allows scrolling text and graphics overlay here:

463  Using Arduino / Programming Questions / Re: Timing problems and Keypad interface on: April 29, 2014, 11:57:59 pm
while (loopCount >= 0 && DoWhile);
What is that supposed to do?
464  Using Arduino / Programming Questions / Re: Langauge question on: April 29, 2014, 11:44:26 pm
! ( pling )
??? You've been watching Victor Borge?

I just know it as an exclamation mark.
465  Using Arduino / Project Guidance / Re: Automatic Drawer Light on: April 29, 2014, 11:05:43 pm
I can assure you it does as, when I was about 6 my parents got their first fridge, I was allowed inside it (before it got cold) to see for myself that the light went out! I guess that I've always been a skeptic.   

That's why the doors don't latch any more.
Yes, but my mother was there and let me out after about 5 seconds.
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