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31  Using Arduino / Programming Questions / Re: How to Prevent Variable Roll Over on: May 30, 2013, 04:08:49 pm
It's possible to use a single interrupt pin plus a regular pin per encoder.
The theory is that each time the interrupt is triggered you read and compare the interrupt pin with the other pin. If they are the same level, the movement was in one direction. If they were different the movement was in the other direction.
Some poeple claim that this doesn't work so well but it has worked fine for me. Hardware debouncing is necessary though.

Here's a working exampe along with some other drivel:
http://perhof.wordpress.com/2012/11/01/using-rotary-encoders-with-arduino/

If you can get the debounce working you can expand the code with a second interrupt for a second encoder.
32  Community / Website and Forum / Re: Arduino Forum Chrome Extension on: May 30, 2013, 03:53:48 pm
It's just a shortcut to the forum from the Chrome Apps screen.
I only use the most visited tab and the Arduino Forum is already firmly stuck at the top of the list.
33  Development / Other Hardware Development / Re: Designing shields with multi-board compatibility in mind? on: May 29, 2013, 03:27:06 pm
...and they use the same pins (SPI + pin 4).

I'd like to correct my own statement. They use SPI + pins D4 and D10.
D10 is one of the mentioned SPI pins on Uno and similar boards but not on the Mega2560 where it is just a regular digital I/O pin but D10 is used by these shields on the Mega boards too.
34  Development / Other Hardware Development / Re: Designing shields with multi-board compatibility in mind? on: May 28, 2013, 04:32:45 pm
What are some of the most popular shields today?

Take a look at the shields section on the products page for a selection of shields. http://arduino.cc/en/Main/Products
I have no information about their popularity but I guess the ethernet and wifi shields are quite common and they use the same pins (SPI + pin 4). They don't conflict with eachother since people only use one of them at a time.

If you're new to Arduino, don't try to design a new product that will work for each and every person in the the world as a first project.
Start by building something simple but fun that you can learn from instead.
35  Development / Other Hardware Development / Re: Designing shields with multi-board compatibility in mind? on: May 28, 2013, 03:11:02 pm
Do you want to support stacked shields?
Could be good to have a look at some of the most popular shields to see which pins they are using (except for SPI/I2C) and try to stay away from those pins where possible to make your shield compatible with other shields.

I mostly use Uno's but some Mega2560's too and plenty of custom projects. Most people I know are using only Uno.


Add some pads so SPI can be jumper selected from Uno's D10-11-12-13, or have wires brought over from Mega's 50-51-52-53 (or whatever they are) for max flexibility.

Don't you get the same flexibilty if you plug into the icsp connector instead as on the ethernet shield?
That header is on the same place on both Uno's and Mega's but is connected to different pins.
Or maybe I didn't understand the idea you tried to share.

36  Using Arduino / Programming Questions / Re: Bootloader delay on: May 28, 2013, 11:33:28 am
Use the Optiboot bootloader or skip the bootloader alltogether to get rid of that delay.
37  Using Arduino / Programming Questions / Re: Where to put 'delayMicroseconds(n) in camera trigger on: May 28, 2013, 05:53:40 am
Did I put the delay in the proper spot in the code? And can additional lines of delay be stacked if the 16000 ms limit is not enough? Am I useing the proper term, Microseconds?
here is the code I used, pin 12 triggers the camera:

You can use additional lines of delayMicroseconds but it might be easier to use delay() instead and specify the delay in milliseconds.
I doubt that you need the resolution of microseconds to catch a falling drop of water at the right time.
38  Using Arduino / Project Guidance / Re: Buying 5m LED strip with power/controller and replacing controller with arduino on: May 27, 2013, 09:11:30 am
If you connect the 12V wire to the 9V/Vin pin of your Arduino as in the picture you linked to you don't need any other power source for your Arduino.
39  Using Arduino / Networking, Protocols, and Devices / Re: How to connect 433.92 MHz Transmitter with Arduino on: May 27, 2013, 07:35:49 am
Try searching the forum a bit for 433 MHz communication.
The pros and cons of different modules have been discussed plenty of times as well as the libraries used by them.
There's no need to start another discussion about it unless you have a more specific question.
40  Community / Website and Forum / Re: karma on: May 22, 2013, 03:09:13 pm
You earn Karma when people click the plus sign next to your Karma level if they think want to give you recognition for your posts.
41  Using Arduino / Installation & Troubleshooting / Re: Arduino Uno board showing red ON on: May 18, 2013, 02:25:04 pm
Red LEDs is usually a sign of a counterfeit board.

Other than that it's not possible to tell what you're doing wrong unless you share some more information with us.
Sounds like you're trying to burn a bootloader but I'm not sure and we can't see what programmer you're using and we can't see the error meesages from here.
42  Using Arduino / General Electronics / Re: question about a schematic on: May 14, 2013, 05:14:34 pm
the LED and resistor works with 9v. just a battery and the LED. but it doesn't light up with 18v. both batteries are new and hold a charge. would this mean i need a bigger resistor?

What worked with 9V?
"Just a battery and the LED" or "just a battery and the resistor and the LED"?

What kind of LED do you have? Do you have any specifications?
43  Using Arduino / Audio / Re: FHT library with electret and lm386 on: May 12, 2013, 09:28:48 am
There are examples in the library's examples folder. Try them first to see if your circuit works and go from there.
44  General Category / General Discussion / Re: cheap duino on: May 12, 2013, 06:46:02 am
I wish people would stop naming their products *duino. It's not very creative and it's obviously confusing.
45  Using Arduino / General Electronics / Re: Where do you buy your components? on: May 11, 2013, 04:13:59 pm
oh, it does

Quote
oddWires details

The full name of oddWires is oddWires.

oddWires is registered in Contra Costa County, CA.

oddWires registered address is:

881 Richard Ln., Danville, CA 94526, USA

http://www.oddwires.com/terms-and-conditions/
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