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1861  Community / Bar Sport / Re: less-ordinary-sensors on: April 14, 2013, 12:55:19 pm
The one that measures a "nuclear event" is a bit like the oil pressure light on your car engine methinks: if it comes on, it's too late.

That one sounds like fun, but testing it would be a real bear.
1862  Using Arduino / Programming Questions / Re: which C++, and is there a specification of just how the IDE tries to "help" one? on: April 14, 2013, 12:36:39 pm
Impressive memory there, @Coding Badly smiley-grin

And thanks @pYro for bringing it up. Not actually sure of how much practical value it is, but I definitely consider it "good to know!"
1863  Using Arduino / Programming Questions / Re: which C++, and is there a specification of just how the IDE tries to "help" one? on: April 13, 2013, 09:58:25 pm
You can write your own main ...

I was not aware of that! Is it documented somewhere?
1864  Using Arduino / General Electronics / Re: Why are real-time clocks always 32.768khz? on: April 12, 2013, 09:39:55 pm
if you need 2ppm RTC, You could try Temperature-Compensated one.
sample;-
DS32kHz 32.768kHz Temperature-Compensated Crystal Oscillator  0°C to +40°C  -/+2.0 ppm

I like the DS3231 and DS3232 I2C RTCs, they include a TCXO with the same spec for almost the same price. DS3234 is an SPI version.
1865  Using Arduino / General Electronics / Re: Why are real-time clocks always 32.768khz? on: April 12, 2013, 08:19:47 pm
First quartz controlled wrist watch at 8192Hz in 1969:
http://en.wikipedia.org/wiki/Astron_%28wristwatch%29
Analog dial and hands.

Quote from: Wikipedia
The Astron was accurate to ±5 seconds per month, or one minute per year.

2ppm, better than the average 32.768kHz crystal-controlled RTC smiley-wink
1866  Topics / Robotics / Re: How to use XTAL1 & XTAL2 pins on: April 11, 2013, 10:52:46 pm
Direct port manipulation can always be used:
http://www.arduino.cc/en/Reference/PortManipulation

I am aware of the following libraries, but I have not used them, so I am unsure whether they may support PB6 and PB7. There may be other similar libraries available too, so I'd Google around some.
http://code.google.com/p/digitalwritefast/
1867  Using Arduino / Motors, Mechanics, and Power / Re: Speeding up wall clock with arduino? on: April 11, 2013, 02:00:29 pm
It doesn't have the "tick" sound or handle switch. The seconds handle is moving all the time, continuously and smoothly. Maybe that means it has no quartz regulator and I can speed the motor up just by adding a little more voltage?

I'd be surprised. A battery-operated clock that depends on input voltage for accuracy wouldn't be a very good clock. If it's not quartz, I'm not sure what it would be.
1868  Using Arduino / Motors, Mechanics, and Power / Re: Speeding up wall clock with arduino? on: April 11, 2013, 07:22:53 am
Hacking a quartz clock movement to bypass its original timebase and replace it with your own is described here:
http://www.cibomahto.com/2008/03/controlling-a-clock-with-an-arduino/

A good application for this:
http://hackaday.com/2011/01/18/the-lunchtime-clock-gives-you-12-extra-minutes/
1869  Using Arduino / Networking, Protocols, and Devices / Re: Unicast using xbee-arduino lib in API mode on: April 09, 2013, 08:34:14 am
Quote
but havent hardcoded any DH/DL addressing in the configuration.
Each series 2 XBee comes with DH and DL values defined. Those are the values that you need to use in the code to talk to a specific XBee.

It looks like he has done that,
Code:
XBeeAddress64 SPOOKY_MAC = XBeeAddress64(0x0013A200,0x409453AA);

He is correct in saying that DH and DL do not need to be set, e.g. using X-CTU or whatever.,
1870  Community / Bar Sport / Re: Quit being Hysterical and Think! on: April 09, 2013, 08:26:47 am
If you're not familiar with it, there is a good story about Steinmetz fixing a generator for Ford here:
http://blogs.smithsonianmag.com/history/2011/08/charles-proteus-steinmetz-the-wizard-of-schenectady/
1871  Community / Exhibition / Gallery / Re: Secret vehicle compartment opened by using stock button combination on: April 09, 2013, 06:30:53 am
I happened to read that article the other day, quite interesting.
http://www.wired.com/threatlevel/2013/03/alfred-anaya/

No technical details, but from the description, as CB says, it pretty much points to a CANBUS tap. I was surprised at how hard they threw the book at the guy that built the traps. He got twice the sentence that the drug dealers did. It would have been hard to argue that he was innocent, but I think they got it backwards.

Hi Jack - do you have any idea about how you would actually go about tapping into the CANBUS for this purpose? I know there is an interface you can buy for arduino, but I have no idea from there haha.

Sorry have never done anything in that area.
1872  Using Arduino / Networking, Protocols, and Devices / Re: Xbee GPIO on: April 08, 2013, 12:22:28 pm
Well that's odd, is it the correct manual?

XBee 802.15.4 (f.k.a. S1)
http://ftp1.digi.com/support/documentation/90000982_K.pdf

XBee ZB (f.k.a. S2)
http://ftp1.digi.com/support/documentation/90000976_M.pdf
1873  Using Arduino / Programming Questions / Re: AVR Programming Options on: April 07, 2013, 04:32:02 pm
Have a look here, there is a series of three tutorials. Have not tried it yet myself.
http://www.jayconsystems.com/tutorial/atmerpt1
1874  Community / Gigs and Collaborations / Re: In search of assistance. on: April 05, 2013, 02:47:51 pm
I have several sketches that I made before the stroke and with my reduced thinking ability I'm unable to take my programing any further.

This sounds like the write-only-code syndrome that all programmers suffer from to one extent to another: Look at code you wrote some time in the past and not able to figure it out without considerable effort. So be optimistic, it may not be what you think, or not only what you think.

At any rate, there are lots of us here that enjoy helping out in any situation. Glad you made it back on the forum.
1875  Community / Exhibition / Gallery / Re: Power Outage Logger on: April 05, 2013, 08:55:11 am
Appreciate the comments.

Hope its battery powered!

LOL, well just the RTC, coin cell on the flip side of the breakout board. The outage is actually logged at the time power is restored, so the data isn't available until after the fact. I do have another lash-up (that predates this project) that sends an SMS notification when a power outage occurs, that one is entirely battery-backed, but has quite a few more moving parts. So I already had power outage logging covered, but this seemed like such a neat and self-contained thing that I couldn't resist, plus a friend was interested in building a couple.
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