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1  Using Arduino / General Electronics / Large LED display control on: April 08, 2011, 04:37:22 am
Hi all, I am building parts of the set for a show. In particular I am making a large LED sign using 600 odd LEDs in 3 channels. What I wish to build is a simple way to dim these LEDs with a FET of some sort. What I do not know is whether I need to make a current limiting circuit or will a voltage control work fine for 200 odd LEDs at ~12 v. (5mm red leds ~30mA max current each) Also the control setup I use will be Arduino generated DMX but fed through a demux which will give me a value of 0 - +10v per channel corresponding to 0 - 255 dmx values. 
2  Using Arduino / Project Guidance / Re: Speaker Sequencer on: April 01, 2011, 07:11:23 am
An Arduino and a bunch of solid state relays or something would work.
3  Using Arduino / Project Guidance / Re: built in serial to midi? on: March 11, 2011, 05:10:56 am
http://arduino.cc/en/Tutorial/Midi

This works, I have made MIDI controllers with it and its fine. the issue is that you get non usb based MIDI so u need a MIDI in for the computer.
4  Using Arduino / Project Guidance / Re: Arduino for Nissan Consult (OBD-like) interface on: March 05, 2011, 07:50:41 am
http://www.plmsdevelopments.com/images_ms/Consult_Protocol_&_Commands_Issue_6.pdf Theres what I found when wanting to do a similar project, It's still in the works, ut stalled at trying to find some other similar work.
5  Using Arduino / Project Guidance / Re: Linux Digital I/O ( Serial without processing / openframeworks )? on: March 05, 2011, 07:36:32 am
I gather you have researched Free Space Optics? there are some big commercial uses of this technology you can look at for ideas as well as a fair amount of open source based stuff.
6  Using Arduino / Project Guidance / Re: AUV Project Update: on: February 28, 2011, 03:03:50 am
You cant just make your own custom H Bridge system with FETs?
7  Using Arduino / Motors, Mechanics, and Power / Re: Please review - Turn green laser module on/off with arduino on: February 22, 2011, 07:11:14 am
Also you may have burnt out the laser unit if you are not using a laser diode driver circuit.
8  Using Arduino / Project Guidance / Re: HELP: New E-Textile DJ Project Questions on: February 22, 2011, 07:08:01 am
I PM'ed you
9  Using Arduino / Project Guidance / Re: Arduino easydriver4.3 on: February 22, 2011, 07:07:21 am
Can you take a photo of your setup?
10  Using Arduino / Motors, Mechanics, and Power / Re: Arduino BT with SC16a Servo Controller on: February 22, 2011, 06:44:59 am
and post your code that has had the best results
11  Using Arduino / Project Guidance / Re: Arduino easydriver4.3 on: February 20, 2011, 08:05:21 am
Can you post code and any schematics/photos you have?
12  Using Arduino / Project Guidance / Re: Interrupts and PWM/DigitalWrite on: February 20, 2011, 08:00:58 am
What method is the encoder? is it optical?
13  Using Arduino / LEDs and Multiplexing / Re: LED Driver on: February 19, 2011, 09:19:02 pm
So you are saying that there will be enough current left to drive the IC without removing the first LED? Also, I forgot to check whether the LED's were common anode, http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=96680916&uq=634337435716300644 these were what i am proposing, they are common anode. Will this invert the intensity of the LEDs?
14  Using Arduino / Project Guidance / Re: Switch Matrix (a newbie question) on: February 19, 2011, 08:37:08 pm
You can debounce signals with hardware.
15  Using Arduino / Project Guidance / Re: Interrupts and PWM/DigitalWrite on: February 19, 2011, 08:35:56 pm
Can you tell me exactly what you have connected the encoder to? Also, how fast are you spinning the encoder?
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