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46  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: February 02, 2012, 01:39:06 am
Yeah I noted the order of what I plugged things in and when they fried this morning after I posted. Yeah it gets freaking hot, good thing they are only a few bucks.
Yeah it has a separate 12v supply for the arduino with the grounds connected. I think the finished product will have one plug powering the arduino and have the arduino turn on a relay for the 5v supply to avoid this problem. Awesome thanks for clarifying!

Here is what I have so far > and

3 more board to prototype out and I'll be half way done.
47  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: February 01, 2012, 02:37:37 am
So I have followed This post > for each output and it works great except I have both V1 and V2 tied together as they are both 5V and I do not need an indicator led1.

I keep frying the tlc5940 chips. I have noticed it happens when I unplug/plug it in otherwise when it works it keeps working for a long time. I'm thinking I getting a surge in current somewhere. Should I have a separate 5v supply for just the chips or should I put an inductor/cap on the +5v supply?

I have a 40amp 5v power supply
48  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: January 16, 2012, 06:43:29 am
I happy to say after getting a more powerful power supply the problems I had went away.
49  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: January 06, 2012, 04:43:08 am
So now I want to use higher power leds for my project such as a 3w rgb led:

This shows how to do it and I figured I'd use a bunch of 2n2222 transistors. It shows the output of the tlc4940 to the emitter and I would have to calculate the base resistor tied to vcc.  (#3 alternate solution)

I ordered a 40amp 5v power supply which should suffice. Should I assume Beta is 100 for a 2n2222 transistor? If so it looks like I should have a 1ohm resistor for the base for a 400ma red and 1.1ohm for 350ma green/blue. Is that right? Is that ideal or should I bump up the Vcc to 12v or higher? Also in the diagram the show the anode connected to VLED(VGB) will that be the same as Vcc?

I'm now using this project to power side emitting fiber optic and the 3w led works noticeably better. I bought that one 3w led but i'm open for suggestions if there are better ones out there.

50  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: December 21, 2011, 08:16:01 am
The chips themselves were cool to touch but the heatsink on the lm7805 was hot as heck. With the rainbow code it is turning on at least 64 leds on at a time @ 20ma each it pulls more than the 1amp 5v can handle so I have ordered a bunch of LT1083 that can handle the higher amperage.

I will need to build a bunch of power supplies or I was thinking on building 1 power supply with many 5v rails. > Is there such a ~12vac transformer rated at 50amps or something like that?

As for the multiplexing of chips I'm not sure if I fully understand. For simplicity say for bank 1 of leds you want all red so you send the code and enable the anode of bank 1. If you wanted bank 2 of leds all red as well you would just enable the anode line for it and it all works well (maybe a little dimmer). Now lets say you want bank 1 all red and bank 2 all green at the same time. How can they be addressed differently if they are all tied to the same 5940 chips (at the same time)?
51  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: December 15, 2011, 03:27:24 am
I slept on it and I think the erratic behavior is because I need a higher current voltage regulator.
52  Using Arduino / LEDs and Multiplexing / Re: 6x TLC5940 32 rgb leds on: December 14, 2011, 08:00:51 am

Is my setup and I I have a rainbow pattern working but after a few minutes it starts flickering as shown here.

I know I should make a function to simplify the code but I"m not that advanced yet.

Thanks Grumpy Mike thats a great idea to control many leds with fewer chips but the information would have to be the same. I guess it would be a trade off.

53  Using Arduino / LEDs and Multiplexing / 6x TLC5940 32 rgb leds on: November 30, 2011, 01:19:37 am

I have a working setup of 32 rgb leds, two chips per color. I was wondering if it would be easier to somehow rewrite the library to have 3 S-inputs (one for each color). Or would I have to connect them all together in series and have 0 -31 for red 32 -63 for green and channels 64-92 for blue.

I want to expand it to  192rgb leds but that will require 36 chips but it looks like the code is limited to 16 chips. Is there anyway to expand this?

Thanks in advance!
54  Using Arduino / Project Guidance / Geodesic dome with 3000 UV leds on: July 26, 2011, 07:27:21 am
I already built an art dome but now I want to light it up using UV leds and have each art piece talk to you and other art pieces. How I plan on doing it is using a rainbowduino controlling 192 UV leds for each pentagon and hexagon. Program each rainbowduino with a set of 6 or more patterns. Have 3 or 4 control lines that it listens on and depending on the binary input of those will cause it to do a different pattern.

Then have a megaduino or another master controller that has enough ports for all the binary control lines to control all the rainbowduinos (or maybe use 12C?)  Then put an audio speaker behind each pentagon and hexgon and have recordings of skits so the artwork talks and lights up as its  sync'd up with the master controller. Also I could sync it with a few songs.

Where would you guys recommend I start? All the code for the rainbowduino is really ment for the rgb leds and the color palette when I just need to be able to turn on or off specific leds (maybe intensity too) so I'm thinking I need to start from scratch.

Any help or push in the right direction would be immensely appreciated.
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