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61  Using Arduino / General Electronics / Re: Gauging Interest: Printed Circuits on Paper on: August 08, 2014, 07:59:14 pm
Maybe I missed where the original poster gave the conductivity of the ink?
The folks with the idea on Kickstarter say 0.2 Ohms/square.
Square what, acres?   smiley-wink
Doesn't matter. The resistance of a square of material is the same whatever size it is. Width and length change at the same rate so, if you double its length, you also double the width. Increased length increases the resistance but increased width decreases it. In a square the changes cancel each other out.
62  Using Arduino / General Electronics / Re: Rotary relay? on: July 15, 2014, 10:44:08 pm
There used to be a device using a stepping motor coupled to a rotary switch. This was many years ago; I think it had around 10 to 12 positions. I used them for remotely switching  the tip and ring of telephone circuits. In this digital telecommunications age, there is probably no demand for switches like this anymore. You might find them in an electronics surplus store, if you're very lucky.

If it were me, I would go to a solid state solution.
I think you're referring to a motorised Yaxley switch. Yaxleys were great because you could add 'layers' to make multipole switches. The only problem was, with too many layers they became too stiff to turn.
63  Using Arduino / Programming Questions / Re: Issues with incrementation and decrementation of negative binary numbers on: July 15, 2014, 10:11:23 pm

Vdd and Vss are respectively connected to +15V and -15V.

I tried to change the 0x200 to 0x400 anyway, and now the voltage loop goes from 0 to 5V, then 5V to 0V,  then it jumps to +10V to 0V, and finally it goes from 0V to 10V.
I know nothing about that DAC, but have you thought that the +10V you're getting may be your +15V supply -5V?
64  Using Arduino / Project Guidance / Re: Powering mulitple Adruinos (8 to 10) - Best Source for power on: July 15, 2014, 09:28:03 pm
I don't see the need for more than one Arduino. One Arduino Uno can control 10 relays. Keep them all near to the Arduino and run all your mains cables from this central position. That way, all your control stuff is in one place for ease of maintenance, and I'm sure that a Uno, a PSU, an RC unit and ten lengths of mains cable is a lot cheaper than 10 Nanos, 10 PSUs and 10 RC units. 
65  Community / Bar Sport / Re: The Cracked Pot on: July 14, 2014, 11:57:14 pm
If the crack is vertical and more than short then the resistance will vary measurably.  smiley-evil
It will also vary slightly on the temperature, and hence the viscosity, of the water.
66  Community / Bar Sport / Re: Hello, its ..... here ringing you from Windows, to tell you that you have a .... on: July 14, 2014, 11:50:50 pm
Hi, how simple can it be to get your phone number, it starts  555.... doesn't it, all the stuff out of the states that I watch have their numbers starting like that.

Tom.... smiley smiley smiley
There used to be, here, a series of free recorded advice lines (I don't think they still exist) beginning with 121. If you didn't want to give someone your real number, you could give them the number of the STI advice line, 121 XXXX. Most never cottoned on... until they tried ringing it  smiley smiley smiley
67  Using Arduino / General Electronics / Re: Rotary relay? on: July 14, 2014, 11:18:33 pm
Hi, don't think you will be very successful looking for a sequential switching relay, the old Post Master General (PMG) used to use devices like that in old telephone exchanges.
They were called uniselectors and usually had 5 banks of 25 positions.  Overkill for the OP's project, I suspect.  smiley
But I've got one, somewhere in my junk pile, if he wants it.
68  Using Arduino / Programming Questions / Re: Trying to get single button to start / stop a show - non-blocking on: July 14, 2014, 10:45:47 pm
Code:
// boolean ShowStarted = LOW; error that showStated was not declared in void loop scope
ShowStarted !== showStated.

I think your shorthand has confused people who don't see the point you were making.

...R
Not only do they not see the point, they don't see their own errors, even when they're pointed out to them.  smiley-mad
69  Using Arduino / Programming Questions / Re: Trying to get single button to start / stop a show - non-blocking on: July 14, 2014, 10:29:01 pm
Oh Henry_Best, you had a typo that was confusing. I think you were trying to say that I had a type case mismatch.
ShowStarted is not the same as showStarted. That is likely the reason why I got that compile error.

Unfortunately you wrote: showStated and not showStarted.
I wrote exactly what intended to write.
Quote
which I think was just a typo between Stated and Started , yes?
It was your typo, I was merely pointing it out to you. See your original post.
Code:
// boolean ShowStarted = LOW; error that showStated was not declared in void loop scope
70  Using Arduino / Programming Questions / Re: need help please? on: July 14, 2014, 10:20:50 pm
What happens if MAX_DISTANCE ==50?
71  Using Arduino / Project Guidance / Re: Notification when door opens on: July 14, 2014, 09:55:58 pm
Class 1 Bluetooth radios have an advertised range of 100Mtrs (actually about 35Mtrs). Would one of those do what you need?
72  Using Arduino / General Electronics / Re: Reduced phone ringing voltage on: July 13, 2014, 10:36:17 pm
Y couldn't I just use something like this.  the input voltage is 80 to 240 VAC
http://www.ebay.ca/itm/1pcs-Solid-State-Relay-SSR-25AA-AC-AC-25A-80-250VAC-24-380VAC-with-cover-/181210728690?pt=LH_DefaultDomain_0&hash=item2a310048f2&_uhb=1

All I want to do is trigger an event on the arduino board so I could use this as a switch when the phone rings
It depends where you are. Here, in the UK, ringing voltage is 75V AC and this reduces the further away from the exchange you are, due to line resistance. Also, I believe SSRs can only be used to switch AC. The one you've shown won't switch the 5V DC an Arduino is capable of handling. Check it's output voltages.
73  Using Arduino / Programming Questions / Re: Trying to get single button to start / stop a show - non-blocking on: July 13, 2014, 10:10:04 pm
Quote
ShowStarted !== showStated

Is that meant to read "ShowStarted != ShowStarted" ?
Nope. It's meant to read exactly as I typed it. It explains why he got a compiler error.
74  Using Arduino / Programming Questions / Re: Trying to get single button to start / stop a show - non-blocking on: July 13, 2014, 10:03:55 pm
while the showStarted !== showStarted
That is not what I wrote and not what you wrote in your code. Read it carefully.
Quote
comment is interesting,
I was pointing out why you got a compiler error. Check your spelling and the case of each of the letters in your variable name.
75  Community / Bar Sport / Re: The Cracked Pot on: July 12, 2014, 09:36:28 pm
IMO the worst ones left the home country to escape religious persecution and persecute others still today.
We kicked them out on the Mayflower, and NO, we don't want them back.  smiley-wink
Quote
We're even getting them from Australia. This place is a money-powered magnet for religious crazies.
There are plenty of gullible fools there to supply the money. P.T.Barnum was correct, there IS one born every minute.
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