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1171  Using Arduino / General Electronics / Re: A case study on why EVERYone should have a logic analyzer on: September 29, 2013, 10:19:35 pm
Good story and nice board/project too!

Coincidentally, I was looking at this a bit earlier and scratching my head:
http://smartmaker.com/index.php/tools/oscilloscopes-logic-analyzers/24mhz-8-channel-logic-analyzer-saleae-logic-compatible.html
1172  Community / Bar Sport / Re: Router recommendation on: September 29, 2013, 12:17:10 pm
Thanks guys, I'm leaning towards Netgear as well.

Rob, I keep looking at NAS but haven't taken the plunge. Which do you have, how do you like it. Do you use it for general storage, backups, media, or ??
1173  Community / Bar Sport / Router recommendation on: September 29, 2013, 09:12:29 am
My ancient D-Link draft-n router seems to have died. Just wondering what folks are using these days, what works well or not.
1174  Using Arduino / Programming Questions / Re: what is :: on: September 27, 2013, 10:14:48 pm
I can't find this in any c programming reference.
example   grid::writeGrid()

Try a C++ reference, e.g. http://www.cplusplus.com/doc/tutorial/classes/
1175  Community / Bar Sport / Re: Terabytes on: September 27, 2013, 10:10:22 pm
Dude!  That is so passé.  Any self-respecting nerd gets one of these...

Haha, yeah those aren't big enough yet, this is for backups so raw capacity wins. These hybrid drives also look interesting, have any experience with those?
1176  Community / Bar Sport / Terabytes on: September 27, 2013, 05:26:57 pm
I ordered a 3TB hard disk yesterday for the princely sum of $130.00.

I remember in the early ‘80s when we got the first PCs at work, they had 10MB hard disks.  At that time, the hard disk alone cost about $1000.00.  I also remember wondering “what in the world would a person ever use 10MB of disk space for?”

So the 3TB disk is 300,000 times larger than that 10MB unit.

And the unit cost has gone from $100.00/MB to about $0.000043/MB.  In other words, the 10MB hard disk was about 2.3 million times more expensive.

Due to inflation, $1000 in 1983 dollars would be worth $2348 today.  So that 10MB disk was actually not quite a million times as expensive.

Surprisingly, somehow, this does not make me feel old. How many other things have improved by a factor of one million in three decades?
1177  Using Arduino / General Electronics / Re: PCB cleaning. on: September 27, 2013, 04:30:14 pm
...then use IPA to clean off the water, since it will evaporate much faster.

Waste of good India Pale Ale. IMHO.
1178  Using Arduino / General Electronics / Re: PCB cleaning. on: September 27, 2013, 08:11:06 am
I buy a pack of tooth-brushes from our local pound store every couple of months, as the Acetone does affect them.

I'd be afraid that acetone would also affect components on the boards.
1179  Topics / Science and Measurement / Re: Stray Voltage on Dairy Farms - Arduino on: September 27, 2013, 06:55:23 am
Stray voltage currents originating from what?

Usually from power transmission. Not an uncommon phenomenon.
http://en.wikipedia.org/wiki/Stray_voltage

Edit: Some general guidelines here: http://www.wisconsinpublicservice.com/business/farm_voltage_measuring.aspx

An Arduino should be able to take the place of the multimeter used to make measurements. Some additional input circuitry may well be required depending on the voltage level. Sounds like a good application for some data logging as well since a 24-48 hour measurement is preferred.
1180  Using Arduino / General Electronics / Re: PCB cleaning. on: September 26, 2013, 08:03:15 pm
Oh lord, talk about an enormous P!TA. After years of soldering, I disagree with what everyone else here has said [LOL]. I "never" remove the rosin flux, just leave it on. The joints don't dissolve or corrode like some people seem to think.

It's strictly a vanity thing with me, I harbor no delusions of corrosion etc.. I have PCBs, kept in my basement literally for decades, soldered with Kester 44 and not cleaned, that show no sign of problems, the bare copper is even still shiny (homemade boards).

Even though I pretty much exclusively use solder with "no-clean" flux, I still clean it off. Especially on SMT boards, makes them look much nicer.
1181  Using Arduino / General Electronics / Re: PCB cleaning. on: September 25, 2013, 03:49:51 pm
I've been using ethanol, old tooth brushes, and compressed air or a hair dryer.
1182  Using Arduino / General Electronics / Re: SMD Soldering Training PCBs on: September 24, 2013, 08:27:35 pm
Nifty.  That's a cool design with the power rail connectors and all.

Thanks!

Quote
For now, I need practice in handling the bare resistors.  I bought a tape of 50 and have probably lost 15 of them already, just putting them in a little tiny parts bin.  Maybe it wasn't a great idea to take them out of the tape.  Storing them in lengths of 5 instead would probably be a wise move.

Yep, I leave 'em in the tape. Capacitors (MLC types) usually aren't marked so I will write the value on the tape and/or leave the tape in the bag from the distributor with the part number etc. on it.
1183  Using Arduino / General Electronics / Re: SMD Soldering Training PCBs on: September 24, 2013, 07:10:45 pm
When I was starting with SMT, I made my own "practice" board, eight 1206 LEDs and 0805 dropping resistors in a common-cathode configuration. I use them frequently as indicators on breadboards. Eight LEDs in less than an inch. Eagle files are attached if you'd be interested in having some made. Here are the LEDs I used in red, green and yellow, and here are the resistors. Just add standard pin headers.

Edit: Actually boards can be ordered directly from OSH Park.
1184  Using Arduino / Microcontrollers / Re: Which external interrupt to wake 328P? on: September 24, 2013, 05:44:52 pm
Well at least we aren't going mad.

I know! That's what I always think in these situations!  smiley-grin
1185  Using Arduino / Networking, Protocols, and Devices / Re: atmega328 from ARDUINO UNO and WIZNET WIZ810MJ work together? on: September 24, 2013, 02:43:49 pm
I've used WIZ811MJ modules, they are software-compatible with the Arduino Ethernet shield. I think the WIZ810MJ should work as well, the differences are mainly mechanical, but see: http://www.wiznet.co.kr/Sub_Modules/en/product/Product_Detail.asp?cate1=5&cate2=42&cate3=0&pid=1035

No experience with the ENC28J60, but others should be able to comment.
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