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1861  Using Arduino / Networking, Protocols, and Devices / Re: More efficient socket / Ethernet library? on: April 17, 2013, 10:10:22 pm
Apparently this was submitted as an issue to the Arduino dev team back in 2011 : https://code.google.com/p/arduino/issues/detail?id=563

It was apparently dropped.

There was also a good discussion about it back in 2009.  What I would call a "proper" solution was not what was implemented. 

Ugh, too bad. OTOH, if you are so inclined, I'm sure that a lot of folks would welcome an improved version published as open source!
1862  Using Arduino / Microcontrollers / Re: Homemade Atmega328P-AU programmer on: April 17, 2013, 09:09:41 pm

Clever.  I'll have to modify (after searching) the six-pin ISP header.  Thanks.

Yeah, they have that one in there too. I've been using them, they work well for me.
1863  Community / Exhibition / Gallery / Re: The Kronos Begins - Arduino controlled stepper sequencer on: April 17, 2013, 08:41:48 pm
Quote
...the final 22-minute short film...

Seems to be corrupt.  Player indicates 21:51 but stops at 14:05.  ...never mind.  Stupid buggy Flash.  I hate Adobe.

You probably just need the Update Du Jour. Or maybe that's what caused it smiley-twist
1864  Using Arduino / Networking, Protocols, and Devices / Re: More efficient socket / Ethernet library? on: April 17, 2013, 08:38:28 pm
The worst case situation here would be to call write one byte at a time as you'll send out a packet for every single byte.  That's horribly inefficient.

Discovered this the hard way. I don't understand the internals of the W5100 or even TCP for that matter, but what you are proposing would seem to make a lot of sense.
1865  Using Arduino / Microcontrollers / Re: Homemade Atmega328P-AU programmer on: April 17, 2013, 08:32:45 pm
Are the six through-hole pads meant to be aligned?

https://www.sparkfun.com/tutorials/114
1866  Community / Exhibition / Gallery / Re: A success story on: April 15, 2013, 07:59:05 pm
Would you mind sharing a few more details of how you did it. I'm about to do same

Hi Mark, glad to share. I have a PowerPoint with a sort of block diagram, is that the sort of thing that would help? IM me your email address and I'd be happy to send it to you.
1867  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.
1868  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!"
1869  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?
1870  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.
1871  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
1872  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/
1873  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.
1874  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/
1875  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.,
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