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22171  Using Arduino / Storage / Re: Problem initializing SD card on: July 05, 2011, 12:28:19 pm
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i just forgot to do that when i copied and pasted the code onto this thread
You also forgot to follow the advice in reply #1
22172  Using Arduino / Project Guidance / Re: Wireless video on: July 05, 2011, 12:24:31 pm
Just receive data along with the image.
You can't transmit and receive at the same time without a large separation in frequency and some very good filters.

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I was hoping to make it a digital signal
No this is way too difficult, generating a QAM signal is not a hobby sort of thing.
22173  Using Arduino / Project Guidance / Re: Pins...how to consolidate? on: July 05, 2011, 12:02:34 pm
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as this is a laser tag game; things move very fast
Compaired to the speed of an arduino your tag game moves at the speed of a glacier.

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Multiplexing sounds better, but I don't have a clue how to do that. Does anyone have a link to a guide?
I used some 74LS259s in this project:-
http://www.thebox.myzen.co.uk/Hardware/Transistor_Tester.html
22174  Using Arduino / LEDs and Multiplexing / Re: Arduino and matrix with 4x4 LED on: July 05, 2011, 11:43:43 am
No presistence of vision and fast switch between LEDs does NOT remove the need for limiting the current to safe levels. You overload the arduino output and damage it.
22175  Using Arduino / LEDs and Multiplexing / Re: Arduino and matrix with 4x4 LED on: July 05, 2011, 11:35:27 am
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Yes, i can use some tranzistors, but why?
You have to add resistors to limit the current through each LED to less than 10mA or use transistors to get more current for the LEDs. If you try and run more current from the pins than this then your arduino will be damaged.

http://www.thebox.myzen.co.uk/Tutorial/LEDs.html

22176  Using Arduino / Displays / Re: writing on the VGA port on: July 05, 2011, 09:51:22 am
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how come screens are usually larger than that, and, for example, the OS(windows) can still access every pixel, when it should send 640x480 pixels only?
Simple most computers nowadays are not VGA, that standard was left in the dirt a long time ago.
22177  Using Arduino / Project Guidance / Re: Arduino control nikon via USB? on: July 05, 2011, 09:45:03 am
It is not easy because the arduino does not have a host USB port, that is it is not a port that can control anything it just looks like a serial port.
There is a host shield but the driving software is likely to be complex before you can even start your application.
22178  Using Arduino / Project Guidance / Re: Beginner LED Project - Advice needed! on: July 05, 2011, 09:42:28 am
Yes but you will need an external transistor or FET to do the switching.
22179  Using Arduino / LEDs and Multiplexing / Re: Connecting an LED on: July 05, 2011, 09:36:13 am
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I notice that a lot of examples connect straight to the pin
These are bad evil examples designed to destroy your arduino. See this link for why you always need a current limiting device.
http://www.thebox.myzen.co.uk/Tutorial/LEDs.html
22180  Using Arduino / LEDs and Multiplexing / Re: Arduino and matrix with 4x4 LED on: July 05, 2011, 09:32:28 am
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cannot let all cols low because i light completly one row and without enought current.
You need some form of external drivers to do this, like a Darlington driver.
Have you looked at the code in the link?
22181  Using Arduino / Motors, Mechanics, and Power / Re: Taking power from an ATX molex on: July 05, 2011, 05:45:23 am
No you need to connect the 5v output of the PSU directly to the 5v line of the arduino.
22182  Using Arduino / Project Guidance / Re: Using Arduino to Control Peltier elements, and read out temperatures on: July 04, 2011, 10:00:30 pm
Just be aware that Peltier devices have a maximum temperate difference across them. If you exceed this then they start acting as a simple heater on both sides. Last time I looked think this was about 30c. It might make a difference to your application.
22183  Using Arduino / Project Guidance / Re: Opening Transistor with Arduino on: July 04, 2011, 09:51:42 pm
Count the posts. I help plenty of people here. However the first requirement in getting help is being able to articulate your problem, with a degree of understanding and not a shit load of attitude. If you use words that you make up how do you expect anyone to know what on earth you are talking about. Now I will express your solution through the medium of dance.  smiley-razz
22184  Using Arduino / Project Guidance / Re: Opening Transistor with Arduino on: July 04, 2011, 08:38:28 pm
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until someone with enough sense can assist a person who has had no direct education in this area.
Ok only got 40+ years in electronics education what do I know. Perhaps a little more than you?
Still  smiley
22185  Using Arduino / Project Guidance / Re: Opening Transistor with Arduino on: July 04, 2011, 08:18:48 pm
The data sheet.

You questions are nonsensical and the words you use are all wrong.
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