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1  Using Arduino / LEDs and Multiplexing / Re: TLC5940 - Arduino gets hot on: September 27, 2013, 03:22:29 am
Changing this one TLC helped.
So currently the Vcc comes from the external regulator, that way i have no problems. Should I put an Elko between the Vcc and Ground? About 0.1µF or more?

Now I noticed another strange thing. Somehow the LEDs are randomly going on and off. It looks like that they get an impulse and then all the lights change. At the beginning it's every ~10sec but after ~30sec the lights change every 2sec.
My guess would be that the 9->5v regulator has got a problem. It's also getting quite hot (but at least i know why), so maybe the voltage is getting unstable. Could that be?

I hoping that when i can solve this problem, it was the last one and I'm about to finish this project! smiley
2  Using Arduino / LEDs and Multiplexing / Re: TLC5940 - Arduino gets hot on: September 26, 2013, 02:52:54 pm
I now tried to get the Vcc for the TLCs from the regulator. Everything worked almost fine. The regulator on the arduino didn't get hot (could be for the short time it was connected) but one (the last one) of four TLCs got hot. Like 50°C, then i disconnected.
For achieving that, I simply put a wire from the Vout of the 9v->5v regulator to the Vcc line and i did the same with the GND line. The GND i additionally connected with the arduino.
I don't know if that helps or makes the problem even more complicated...

I'm really thankful for every advise!
3  Using Arduino / LEDs and Multiplexing / Re: TLC5940 - Arduino gets hot on: September 26, 2013, 11:26:22 am
Okay then I'll just leave the regulator. Thanks!

Well there is the Vcc. That's the one i was thinking i would take up too much current.
So we have got the TLC data lines (SCLK, BLANK, GSCLK, XLAT) and the 5V powering the TLCs and the GND which also has a connection to the regulator.

Those lines go to the conductor board with the TLCs. I attached a picture of the circuit diagram.
4  Using Arduino / LEDs and Multiplexing / TLC5940 - Arduino gets hot on: September 25, 2013, 04:01:25 pm
Hello Community,

I'm working on this project where I want to control 108 LEDs using 7 TLC5940.
My current set up:
I have the 7 TLC5940 daisychained, powering them with the 5v from the arduino UNO. The distance between TLCs and arduino is ~40cm. The LEDs I'm of course powering with a separate power source. This external power source I'm regulating from 9v to 5v (although I just got the input i could just use the 9v - i wonder why i didn't think about that earlier). Then I have a connection in between the GND of the external power and the Arduino GND.

Using this setup I have the following problem: Even when I'm only using 4 of those TLC the voltage regulator of the ardunio (the chip in between the jack and the USB) is getting hot, like 100°C. But not instantly, it takes about 30-60 secs.

I really have no clue where the problem could be.
Next step I will do is measuring the current in the different parts of the circuit, but I would be much happier if you could give me a better advise! smiley
5  International / Deutsch / TLC5940 mit externer Stromversorgung on: January 11, 2013, 10:39:30 am
Hallo Community,

ich arbeite gerade an einem Projekt mit mehreren TLC5940 und einigen LEDs womit ich klarerweise eine externe Stromversorgung brauch.
Also gehe ich mit dem Pluspol der Spannungsversorgung zu den LEDs und dann in den IC. Wo schließe ich dann aber den Minuspol von der externen Spannungsversorgung an? Muss ich dabei auf noch etwas achten? Also z.B. noch andere Anschlüsse änderen so dass alles richtig läuft?

Danke schon mal für eure Hilfe!
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