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826  Using Arduino / General Electronics / Re: Need to amplify mV with high frequency, so I can read to Arduino. on: October 07, 2013, 12:49:51 pm
If the signal is AM modulated, use a diode detector on the RF, and amplify the video signal. The Arduino *still* might not be able to keep up, but you have a much better chance than with the RF!
827  Using Arduino / Programming Questions / Re: Complex number printing on: October 05, 2013, 10:19:31 am
It is probably not included for space reasons. You will have to roll your own. Like AWOL hinted at, if you are going to do lots of complex arithmetic, you probably need to rethink your processor approach.
828  Using Arduino / Programming Questions / Re: 2 & 3 Bit Numbers on: October 03, 2013, 05:16:45 pm
Just use the high and low nibble of a byte to store your numbers. You will need to write separate code to unpack and use them.
I think it would be much better to just save them as individual bytes. Do you really have that many of them?
829  Using Arduino / Project Guidance / Re: Project Guidance, please help. Panoramic photos. on: October 03, 2013, 12:47:24 pm
Why not buy a bunch of old digital cams from a thrift store and hack the power buttons? Then you need to simply activate a bunch of relays at the same time, which is a piece of cake.
830  Using Arduino / Project Guidance / Re: Help with DS18S20 on: October 03, 2013, 12:45:10 pm
Just hook up one to get started.
831  Using Arduino / Project Guidance / Re: Using Arduino Uno to read registers from a ROM on: October 02, 2013, 05:10:29 pm
How is the device connected? parrallel? I2C? One-Wire?
832  Using Arduino / Project Guidance / Re: Arduino Uno R3 works on Home PC but not in Car :( on: October 02, 2013, 02:35:28 pm
How are you powering the UNO?
833  Using Arduino / Programming Questions / Re: Welcome Please help is simple on: October 01, 2013, 02:26:03 pm
Your other post got deleted> Read this: http://forum.arduino.cc/index.php?topic=97455.0

And we will not just "ammend" your code to do your assignment for you.

You need to ask a specific question like:
"How do I tell whether a value is between two limits? I tried this...and it does not work."

Where the ... is the code you used in an attempt at solving the problem.

Hint:
you need an if () statement.
834  Using Arduino / General Electronics / Re: Transistor Graphing Device on: October 01, 2013, 02:13:54 pm
It depends on the op-amps, I am sure that these, like most, require a split supply*. I don't know what you mean by "top right" but the input at the *top left* is stated to be +/- 10 V meaning that the circuit can sink and source current.

A positive rail only supply would only be able to source current.
835  Using Arduino / Programming Questions / Re: Welcome Please help is simple on: October 01, 2013, 02:08:49 pm
Use code tags. And do your own homework. Please ask a *specific* question, not just "write this code for me!"
836  Using Arduino / Programming Questions / Re: ino or cpp? on: September 30, 2013, 06:15:59 pm
A global is only seen from the point where it is defined to the end of the file. I just created an
int afterSetup;

between setup() and loop() and put an
afterSetup = 99; in setup and received an:
"afterSetup" not declared in this scope error.
837  Using Arduino / Programming Questions / Re: ino or cpp? on: September 30, 2013, 05:49:05 pm
What about global variables? for those it *does* matter!
838  Using Arduino / Programming Questions / Re: Call for comments: Programming traps and tips on: September 30, 2013, 05:22:29 pm
Going way back, and maybe too late already, but you should add something like:
To store dissimilar things, use an array of structs.
839  Using Arduino / Programming Questions / Re: ino or cpp? on: September 30, 2013, 05:08:11 pm
Thanks, I forgot to say no classes, or .h's required.
840  Using Arduino / Programming Questions / ino or cpp? on: September 30, 2013, 04:29:50 pm
My clock program has gotten big enough that I am going to need to split up the source files. Is it better to put my functions in .cpp or .ino files?
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