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46  Community / Exhibition / Gallery / Re: LED Suit Build - 2011 on: September 24, 2011, 06:35:03 pm
I don't think you really need a schematic that shows pin 11, pin 13 and ground wires being plugged in.  In fact in this post I provided you this exact detail in december of 2010 including a link to the library.,8801.msg72389.html#msg72389

In the above links and videos I provided ...

1) A link to the exact chip I am using

The LEDs are 5050 style with built in WS2801 chip.

Form factor is like this but with WS2801 chip.

2) Exact details on the music board I am using ..

For music control on board - I use this.

3) A library to control the LEDs being used...
Here is a library to control any of the above mentioned LEDs.

4) A complete video with close up on the LEDs and full details on the build.

5) Complete details on how to power 70 LEDs on a craftsman tool 12v battery.

Just because I don't provide the 4 libraries and multiple applications on the PC and the arduino it takes to pull this off you tell me I am not "sharing".  It would take way more than I can document to understand what it takes to pull this off, sorry.

If you try to get this working and need help - ask specific questions.  Don't ask "give me everything".

Best of luck.
47  Community / Exhibition / Gallery / Re: LED Suit Build - 2011 on: September 24, 2011, 11:49:41 am
We purchased some 5v power adapters made to charge cell phones. Since they handle 1.2 amps each - I got 4 of them to run the 70 RGBs in the suit.  The concept worked well and has proven effective.

We also added the spectrum analyzer shield and microphone setup and tested it with ambient music (from a small self powered speaker).

Here is an updated video showing this years Halloween costume suit with these updates.

One month until Halloween - maybe time to give this robot some pants smiley
48  Using Arduino / General Electronics / Re: List of your favorite IC's on: September 23, 2011, 11:54:18 pm
You mentioned the TLC5940 so I"ll toss in the WS2801.  This chip has what I consider the best number of fade step levels - 256 - matching the byte and has a smooth fade.

MSGEQ7 (and related shields)
Outside the atmegaxxx - this chip is my favorite as it provides fantastic music reading capabilities at a very low price point.  
49  Using Arduino / LEDs and Multiplexing / Re: Controlling/Strobing 60 LED'S on: September 23, 2011, 11:55:35 am
If you are going to run this directly from your auto 12v you should consider using some type of regulating device such as the 5v type due to the fact that 12v in your lighter is not normally a perfectly regulated 12v (to say the least - see below).
A second problem is that nominally "Twelve-Volt" power in cars fluctuates widely. The actual voltage will be approximately 12.5 volts when dormant, (less when cold) approximately 14.5 volts when the engine and the alternator/generator are operating, (more when cold) and may briefly drop as low as 5-6 volts during engine start.[7] DC/DC converters will usually compensate for these small fluctuations.[citation needed]

For that reason I would suggest just going with the new standard - which is 5v for iPods and such .. this also works perfect for powering the arduino.  Then just use the correct resistor for 5v - 1 per LED.  If you don't go with 5v, I would still suggest using a dc/dc regulator  your 12v auto power.
50  Using Arduino / LEDs and Multiplexing / Re: Controlling/Strobing 60 LED'S on: September 22, 2011, 05:50:45 pm
You can get a 1.2 amp 5v USB car charger.  I just used 4 of those to run 70 RGBs and it works fine. 

It is important that you don't just use any 5v charger, find one with at least 1200ma (1.2 amps) or use multiples.

I used old USB cables and splice into the red / black wires.  It is important to NOT assume the colors are correct, I see the black and red reversed at times so be sure to test.  Also the chargers are sensitive to reverse polarity .. so assure you now the 12v +/- before you plug that in as well. 
51  Using Arduino / Project Guidance / Re: Need help understanding targeting system in TED mosquito killing laser system on: September 12, 2011, 10:40:33 am
Check out the kinect.  If you are attempting to track something with your computer and locate the exact position in a 3d realm I think you will need more than a camera and/or an arduino.    I hope you are not attempting to track something so small. 

This type of project is not likely to be handled by an arduino outside controlling the physical side.  You have tons to work out before you are ready to attempt the physical side of this type of a project.  Before you can aim at something - you have to know it's exact position.  You can tell that without ever controlling an external device. 

My advice - start with the PC .. the arduino won't do much for you here - at least not at this point.  If you do find out want to control something - then figure out the desired specs of how fast it needs to move, how accurate and what range.  Someone may be able to help understand if the arduino can handle the requirements once there is that level of detail available.

52  Using Arduino / LEDs and Multiplexing / Re: dmx controled led strip on: September 12, 2011, 10:23:25 am
The most important thing to understand at this point is that there are few strips that give you individual control. If you go with one that does have individual control it will have RGB lights.  You can turn the R/G and B lights on at the same level to get white with dimming of each LED individually.  

This strip has individual control - the at sparkfun do not.

You may want to consider a non-strip solution and even raw chips for this project unless you need a small number of lights or have a good budget.  One TLC can run 16 leds with around 4000 levels and one WS2801 can run 3 leds at 256 levels.

Hope that helps - best of luck.
53  Using Arduino / LEDs and Multiplexing / Re: dmx controled led strip on: September 12, 2011, 09:41:36 am
I have never seen white strips with individual control over each LED.  Do you see such a product?  If so - so you have a link?
54  Topics / Device Hacking / Re: Ipod power supply on: September 11, 2011, 09:01:35 pm
Did you try to just not connect power but do connect ground and other 2?  If you tried that and it still does not work then I would venture to say it is not possible. 
55  Using Arduino / LEDs and Multiplexing / Re: Led matrix and arduino ... how to ... on: September 11, 2011, 11:38:13 am
As mike says - breaking into multiple parts is a great way to attack such a project. I use that concept for most of my larger arduino based builds.  Feeding that many LEDs directly from the computer is not hard using the right technology.   However, it will be a long term learning project for you to build this from scratch with raw chips, the arduino and little experience.  That can be very rewarding - just be ready for it.  Also start much smaller and understand you can't just "scale up directly" as Mike says. 

If an electronics project designed to teach you about the micro-processors is what you are after, then arduino is perfect.  If you are a computer pro that wants to program a matrix then a "turn key" system may be in order.

56  Using Arduino / LEDs and Multiplexing / Re: Led matrix and arduino ... how to ... on: September 11, 2011, 08:35:27 am
The TLC chip details can be found here .. it runs 16 channels - which means one can run 5.3 leds.
It will take 36/37 TLC chips to run that many leds unless you multi-plex.  If you re-read all the posts you will see the 3 TLC comment was a typo.

You need to get the data quick enough to update the data 30 fps directly from the computer - that may be pushing the serial limits of the arduino - hence the tall order comment. 

The TLC link I provided above was the first result in a search for TLC5940 on this site - you will have to learn to do some forum searches and start doing lots of learning.   Check this other forum link - 112 RGBs and see the scale of the project.,8664.0.html

So consider the scale, time and budget of what you want to do and more forward accordingly if a build is your plan.
57  Using Arduino / LEDs and Multiplexing / Re: Led matrix and arduino ... how to ... on: September 10, 2011, 10:16:21 pm
maybe round 30 fps
From your responses it seems you are looking to stream a 200 LED matrix from the computer at 30fps. 

Pretty tall order for an arduino but maybe not impossible.

Are you a computer person wanting to control a matrix?  If so, what language are you using, etc?
58  Using Arduino / LEDs and Multiplexing / Re: Led matrix and arduino ... how to ... on: September 10, 2011, 01:40:12 pm
If you want to dim the LEDs individually, you're going to need something like 3 TLC5940s.
Did you mean to say 3 TLCs or 30 TLCs (i.e. 37)? 

To the original poster?
 - Is there a maximum size?
 - Do you want to stream the matrix content directly from a computer?
 - You say video - how many frames per second are you looking for?

These questions will determine how feasible the arduino platform is for this purpose.
59  Using Arduino / LEDs and Multiplexing / Re: 20 RGB Leds? on: September 08, 2011, 10:40:59 pm
Here is how I did it with 595 shift registers.

Think you may need common anode to use the nicer TLC chips.

Best of luck.
60  Using Arduino / General Electronics / Re: electric fence batteries - possible use ? on: September 08, 2011, 05:15:00 pm
The above battery ran a color cycle pattern on 70 LEDs for 45 minutes using an inverter.  When the car chargers come in I will compare times and report the difference and any other issues / information that may be helpful.

As per my last post - the car chargers work well.  To save space I pulled off the end that goes into the cig socket and wired the black and red wires to the the 12v lithium icon battery mentioned in my last post.  4 of the chargers connected to the same 12v battery ran the suit for an hour.  This is a 30% improvement over the inverter - with less space and no heat. 

Not sure if this solution works for you, but reporting back as promised.  Best of luck with your project.
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