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31  Using Arduino / Project Guidance / Re: Can a single gps reciever get a RTK accuracy? on: August 12, 2014, 10:51:43 am
The "NavSpark" line of GPS receivers includes a model (~$80) that will output "raw" data that they've demonstrated to be capable of ~20cm accuracy when used in pairs. The NavSpark site includes a number of examples of how differential GPS is set up.

You'll also want to investigate "RTKLib" and its associated tutorials.

For someone with the time and dedication (and about $300) I don't think it's unreasonable to expect that ~20cm accuracy.

32  Using Arduino / General Electronics / Re: Beginner Soldering iron Choice on: August 11, 2014, 07:10:45 pm
.015" would be 26 gauge or the same size of the wire of an ethernet cable. I'm sure it's preference or dependent on how fine of soldering tasks you're taking on, but for general use it's too small. You spend more time unreeling more wire than you do soldering.

I'd go for the .031".
33  Using Arduino / Motors, Mechanics, and Power / Re: Is this practical? on: August 11, 2014, 06:56:11 pm
It was already covered that induction motors won't work with DC current. But whether or not you'll find an induction motor in a vacuum cleaner should just require a little common sense.
34  Using Arduino / General Electronics / Re: Beginner Soldering iron Choice on: August 11, 2014, 04:59:47 pm
As far as wire solder, I would recommend a 60/40 rosin core wire solder like this one:
http://www.gotopac.com/AIM_AW6337_015NC209_p/aw6337-015nc209.htm
It's no clean you so won't have to clean the excess flux off when your finished. You can just solder and go.

Very nice; I never thought to look to see if no-clean, flux core solder existed.

More details if anyone else is like me: http://www.aimsolder.com/content/glow-core-cored-wire
35  Using Arduino / Motors, Mechanics, and Power / Re: Is this practical? on: August 11, 2014, 04:52:43 pm
Here's your logic, Tinkerbell.

https://www.youtube.com/watch?v=WAIoDl7JTAA
36  Using Arduino / Motors, Mechanics, and Power / Re: Is this practical? on: August 11, 2014, 08:04:09 am
He mentioned the motor came from a vacuum cleaner ("near-dead vac"). An induction motor would be too large, heavy, or expensive for such an application.
37  Community / Bar Sport / Re: How do they weigh.... on: August 10, 2014, 12:32:07 am
was helium not abundant on the moon?

http://en.wikipedia.org/wiki/Atmospheric_escape

Lighter gases more easily escape the atmosphere of lighter planets/moons.
38  Using Arduino / Motors, Mechanics, and Power / Re: Is this practical? on: August 10, 2014, 12:23:37 am

39  Using Arduino / General Electronics / Re: Beginner Soldering iron Choice on: August 10, 2014, 12:01:35 am
Search eBay for "936 soldering iron". Not only is it a good iron but t's a popular, clone format so replacement wands and tips are very easy to find and quite inexpensive.
40  Using Arduino / Project Guidance / Re: Micro Infrared Bar Code Scanner on: August 09, 2014, 11:53:55 pm
Posted this once, but got no replies.

No replies other than the replies you got, you mean.
41  Topics / E-Textiles and Craft / Re: Inkjet conductive ink? on: August 09, 2014, 11:13:52 am
The "AgIC Print" project seems to have the problem solved. They sell the cartridge, cartridge+printer, or a refill kit (YMMV).
42  Topics / Robotics / Re: Using an Arduino as an RC reciever module on: August 05, 2014, 02:31:42 am
Not clear what you're trying to do here. You have an Arduino controller (starting with a simple pot first) and you're trying to figure out how to send the signal via your 433MHz transceiver to another Arduino+transceiver combination sitting on top of a KK board?
43  Using Arduino / Motors, Mechanics, and Power / Re: Reflow oven (toaster) heater AC control on: August 05, 2014, 02:27:15 am
That's probably what I'm going to go with, so I can avoid the need for an optocoupler to feed a triac as well as perform zero-crossing detection. However, how would I go about the very slow PWM?

The PID library works with a relay and has a default sample time of 200ms. Just keep adjusting the setpoint in your sketch to whatever you want and let the library figure out when to turn the relay on/off.

A bit overkill perhaps, but y'know.
44  Using Arduino / Motors, Mechanics, and Power / Re: Stepper motor help for automation mill on: August 03, 2014, 03:15:43 am
FYI this is a necrothread.
45  Using Arduino / General Electronics / Re: Cheap Soldering Iron Problems on: August 02, 2014, 08:55:55 pm
Try a 936 clone. You'll find these with a number of brand names, always around $40-$50. Both the tips and the entire wand is replaceable. You really don't need a higher wattage unless you're too impatient to wait the 60 seconds it takes to get up to temp or unless you're trying to solder things like large connectors on heavy gauge wire.

You need to be cleaning your tip regularly as you're soldering using either a wet sponge or the "gold curls". If you don't your tips will go bad much more quickly. You can also get tip tinning powder to help restore a bad tip but it's not a magic bullet.
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