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271  Using Arduino / General Electronics / Re: Arduino output gives only 3V on: August 10, 2014, 01:36:50 pm
Where are your series led resistors?
272  Using Arduino / Programming Questions / Re: Problem with code for stair lights project... UNO, 74HC595 & ULN2803A on: August 10, 2014, 12:23:45 pm
- Take a picture of the wiring and show us.
- try removing  the wire from pin 10 on the 2803s
- Replace the LED strips with LEDs with series resistor and try.
273  Using Arduino / General Electronics / Re: Novice question re pin connections to Arduino on: August 10, 2014, 12:15:36 pm
@RobRothman

Yes, you are worrying too much.
Buy the same as in the image, i.e gold plated.
These won't  disconnected unless you tug at them!
I do this all the time and I prefer using female connectors to male headers.
Use Aluminum foil duct tape to keep them together if you wish. They wont disconnect!
But it's your choice.

Plug in and keep in touch.
274  Using Arduino / General Electronics / Re: Novice question re pin connections to Arduino on: August 09, 2014, 11:32:13 pm
I would use female for the connectors and a gender changer on the Arduino.
275  Using Arduino / General Electronics / Re: Novice question re pin connections to Arduino on: August 09, 2014, 10:55:16 pm
I use aluminum foil duct tape.
http://www.venturetape.com/product.php?productid=1197&cat=26&page=1


276  Using Arduino / General Electronics / Re: Novice question re pin connections to Arduino on: August 09, 2014, 09:58:04 pm
See:
http://www.pololu.com/category/70/crimp-connector-housings

http://www.pololu.com/product/1930

http://www.pololu.com/product/1931

http://www.pololu.com/product/1928

http://www.pololu.com/product/1901
277  Using Arduino / General Electronics / Re: Protecting diy pcb boards.... on: August 09, 2014, 09:44:07 pm
I use:
http://www.mgchemicals.com/products/prototyping-and-circuit-repair/prototyping/liquid-tin-421/

You can also spay a clear lacquer after you solder everything.
Also look at conformal coating.
There is a heat transferable solder mask sometimes offered on eBay.
http://www.ebay.ca/itm/Solder-Mask-Resist-Green-Dynamask-10-sheets-20-x-30-CM-Incl-50-gram-developer-/271223870457
278  Using Arduino / Programming Questions / Re: Problem with code for stair lights project... UNO, 74HC595 & ULN2803A on: August 09, 2014, 05:39:07 pm
The 12 volt ground must go to the Arduino ground.
279  Using Arduino / Programming Questions / Re: Problem with code for stair lights project... UNO, 74HC595 & ULN2803A on: August 09, 2014, 04:08:12 pm
Quick note, you need some decoupling in your circuit. Use ceramic .1uF capacitor on each 595 VCC to GND
I do not see a common ground to the Arduino, do you have one?
280  Using Arduino / Programming Questions / Re: Problem with code for stair lights project... UNO, 74HC595 & ULN2803A on: August 09, 2014, 03:46:03 pm
SPI and the 595 go together very nicely, you may want to use it.

What is this about?
if ( myDataOut & (1<<i) )
281  Using Arduino / Programming Questions / Re: error in code on: August 09, 2014, 03:35:33 pm
It gets better with practice.
282  Using Arduino / Programming Questions / Re: Problem with code for stair lights project... UNO, 74HC595 & ULN2803A on: August 09, 2014, 03:31:55 pm
I cannot see the image that well but do you have series resistors in each LED circuit?
And you do have a common ground to the Arduino?
283  Using Arduino / General Electronics / Re: Beginner Soldering iron Choice on: August 09, 2014, 03:03:09 pm
If that's all you are going to spend either is OK.
Look on YouTube for surface mount tutorials.
See:
http://www.adafruit.com/products/1886

https://learn.adafruit.com/adafruit-guide-excellent-soldering?view=all

https://www.youtube.com/results?search_query=surface+mount+soldering+tutorial
Google for more.

Use lead solder responsibly, stay away from lead free.

ALWAYS USE LIQUID FLUX similar to this.
http://www.jameco.com/1/3/liquid-solder-flux-for-electronics

Clean your solder iron often.
284  Using Arduino / General Electronics / Re: Gauging Interest: Printed Circuits on Paper on: August 09, 2014, 02:53:55 pm
Photo resist method times:

5 seconds for printing the positive or negative on a transparency using a inkjet printer.
3 minutes for exposing one side to a pre-sensitized PCB using a sun lamp.
3 minutes for developing in a weak solution of Oxiclean and water.
10 minutes etching in Ferric Chloride solution can be reconstituted with H202.
3 minutes stripping in a weak solution of Draino or a strong solution of Oxiclean.
30 seconds in tin plating solution.

Less than 1/2 hour total, what can be simpler?
You "can even use PTT components".

Result, a great quality PCB that will last for years.

I have used pre-sensitized PCBs that are more than 10 years old and can still be used effectively.

Edit there is this:
https://www.kickstarter.com/projects/1597902824/agic-print-printing-circuit-boards-with-home-print
285  Using Arduino / Programming Questions / Re: Two button edge detection. on: August 09, 2014, 01:26:27 pm
I see no debouncing on the switches here.
Do you have pull-ups attached to the switches?
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