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19441  Using Arduino / Programming Questions / Re: Strings becoming null on: September 23, 2011, 05:41:19 pm
Two lots of 20 bytes will not gobble memory.
What will gobble memory is extreme fragmentation, but without seeing all your code, all we can do is guess what is going on.
19442  Using Arduino / General Electronics / Re: Can somebody please explain wiring of RGB LED on: September 23, 2011, 05:23:14 pm
"40 - 50" what?
40 mA is the ABSOLUTE maximum per-pin current.
You shouldn't be going near this figure.

Posting vague, unit less numbers is a complete waste of time.
19443  Using Arduino / Motors, Mechanics, and Power / Re: Need help with improving/ building motor driver on: September 23, 2011, 05:08:11 pm
Stall current is the current the motor draws when the motor is...stalled, i.e. the rotor is locked solid.
Isn't Ohms Law taught in CS these days?
19444  Using Arduino / Programming Questions / Re: Strings becoming null on: September 23, 2011, 04:56:51 pm
The size of your sketch has no relation to the amount of RAM you are using.
You need to post all your code.
(I second the comment about not using String)
19445  Using Arduino / Project Guidance / MOVED: Arduino & App Collaborations on: September 23, 2011, 07:05:11 am
This topic has been moved to Gigs and Collaborations.

http://arduino.cc/forum/index.php?topic=73214.0
19446  Topics / Robotics / Re: 10 servos with 2 cells of 9 volts Humanoid Robot on: September 23, 2011, 03:19:57 am
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The best solution for my robot is a 2 cells of 9 volts
That's probably the worst possible solution, if you mean the ordinary small radio 9V battery.
You'd be better off with packs of four AA cells to power the servos.
19447  Using Arduino / Project Guidance / Re: mesuring distance between 2 arduinos using gps and xbee on: September 23, 2011, 01:58:36 am
You could provide the delimiters as parameters.
19448  Using Arduino / Sensors / Re: Help me decide please. on: September 22, 2011, 02:00:16 pm
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Contradicting my initial requirements, it has come down to 0.08 mm
You're talking about a resolution of better than 1/100th of a wavelength.
19449  Using Arduino / Project Guidance / Re: How to make a self controled car with Arduino on: September 22, 2011, 01:57:43 pm
..and built from cast iron, or carbon fibre?
19450  Using Arduino / Project Guidance / Re: How to make a self controled car with Arduino on: September 22, 2011, 11:58:31 am
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So which motor to use ?
Will servos be enough ? Or is there some cheaper motor to move the robot ?
Why don't you tell us the dimensions of the vehicle, so we don't waste time guessing?
19451  Using Arduino / Programming Questions / Re: Acceleration of pov display on: September 22, 2011, 11:53:16 am
http://code.google.com/p/digitalwritefast/
http://www.arduino.cc/playground/Learning/PortManipulation
19452  Using Arduino / Programming Questions / Re: Acceleration of pov display on: September 22, 2011, 11:36:27 am
You could get rid of the digitalWrite calls.
Either use port manipulation, or the "fast" versions of these calls.
19453  Using Arduino / Sensors / Re: Analog Inputs peaks on: September 22, 2011, 09:58:42 am
Noise?
Really, you haven't given us much to go on there.
What is it wired to?
How much does it change?
How do you know the input doesn't change?
19454  Using Arduino / Sensors / Re: Help me decide please. on: September 22, 2011, 09:56:52 am
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Can someone tell me if i can measure the amplitude or the strength of the echo from the ping sensor?
No, that isn't possible directly.
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Or are there sensors out there in the market that gives a provision to measure the amplitude other than the time of flight?
Yes, they're called oscilloscopes.
19455  Using Arduino / Project Guidance / Re: Making a Functional Computer out of and Arduino Uno on: September 22, 2011, 08:54:59 am
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I'm just trying to imagine how to connect all these peripherals to Uno board.
How many lines do you think an SD card takes?
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