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1  Using Arduino / LEDs and Multiplexing / Re: Are there any chips that do PWM + Multiplexing like TLC5940 + MAX7219? on: November 19, 2012, 06:46:18 am

I have used some "led pixels", which are RGB leds with an integrated controler.

I used the ones with the WS2801 controler.

It is a 3 channel PWM shift register which can be "cascaded" with as many ws2801's as you want.
They are perfect since they support 3 channels (one for each color) and they support 8 bit color per channel.

2  Using Arduino / LEDs and Multiplexing / Re: Addressable LED strips - how to? on: May 08, 2012, 06:09:47 am
- How do I wire the 4 pin to the Arduino correctly?
I think that those drivers are I2C ¿?

- What kind of 5v power do I need to run the logic?
Do you mean to get the arduino working? Just USB power would be ok, or any stabilized 5 V PSU would work. You do not need much power (amps)

- If I get this working I'll be extending it to 20m.  What would my current usage look like then?
-That would depend on how many LEDs / drivers you have, and how much current they need to work, but it will be quite a bit.

- Do I need to worry about running too many amps through the 5v? (I'm imagining if one of the strips gets disconnected
through the 5v¿? Nope, you have to worry about the 12 Volts instead, that is where the LEDs/Drivers will get feed. 5 Volts is only for the arduino. Look out, since you are using just 12 volts over a long strip you will get voltaje drops, maybe you want to feed it not from an end, but from some places.

- Do I need a common ground?  I'm guessing yes.
Of course, ALWAYS!! Even if you do not need it, always put all the grounds together.

- Do you know the original manufacturer?  I'd love to contact them directly and get a sample Arduino app to extend for my use.
Not me.
3  Using Arduino / LEDs and Multiplexing / Re: PWM with high power LEDs on: April 24, 2012, 01:45:03 am
Ok!! Thanks!!

I thought it would not work properly that way, I am buying and preparing a prototype in a breadboard as soon as I can

4  Using Arduino / LEDs and Multiplexing / Re: PWM with high power LEDs on: April 23, 2012, 09:06:32 am

But would that be fast enough to fade or dimm the LED without flickering using arduino PWM?

5  Using Arduino / LEDs and Multiplexing / PWM with high power LEDs on: April 23, 2012, 06:40:29 am

I want to make something like a mood light lamp. And I want to make it so it lights up a whole room, so I will use some high power LEDs.
They need some high power drivers in order to work.

This mood light lamp will have some features, like smoothly change its colors automatically, or change the colors according to the ambient sound (so it changes according to the music a microphone gets), or maybe even according to some inputs (maybe buttons, maybe adjustable resistors.

I will be using an arduino to control it all.

Now, my question is, how can I drive the amount of light the high power LEDs will emit? I guess I could use arduinos PWM, but, how do I do to connect the arduino PWM output to the high power driver. Do I need a special type of driver?
I will be using RGB high power LEDs, but can someone tell me what driver could I use in order to control it from the arduino PWM?

I have been researching in google but I do not get anything clear.

Thanks in advance!!
6  Using Arduino / LEDs and Multiplexing / Re: problem with led pixels on: April 23, 2012, 01:58:18 am

There are some libraries that work with many RGB PWM drivers, such as WS2801 and LPD6803.

For example:

Use that library and you do need to know which strand (driver) type are using, just need to know your strand has to have one of these drivers:
    * 595 style shift registers
    * hl1606 based led strips
    * lpd6803 based led pixels
    * tm1809 based led strips
    * tm1804 based pixels
    * ws2801 based led strips and pixels
    * lpd8806 based led strips

I also made the adalight project, but I bought the strand from adafruit, just to avoid the problems you are having

7  Using Arduino / LEDs and Multiplexing / Re: TM1640 based, 16 digit display (dealextreme) on: January 13, 2012, 05:27:06 am
 smiley-fat Ouch!! How could I be so stupid!!  smiley-confuse

You are right it is more than possible.

I did not mean it was impossible because of the 24 vs 28 pins, just because I was thinking that each display would need another IC to multiplex or something like that but I see they don't, I guess that using common cathode displays, all GRID1-GRID16 pins but one of the TM164 keep high for 500usec, then another, then another...

Thanks for explaining!!

If this TM1640 had PWM, it would be just perfect  smiley-razz I could drive with just one 28 pin IC like 43 RGB LEDs... really cheap solution for ambilight like projects (I am still looking for something cheaper than what I did so everyone can have an easy and cheap one)

8  Using Arduino / LEDs and Multiplexing / Re: TM1640 based, 16 digit display (dealextreme) on: January 12, 2012, 10:01:16 am
Could someone please, explain me how a single IC with 24 pins, can address 16 7-segments displays?
You need to individually address 128 LEDs, how do you do it with just 24 pins?

Do each display have another IC or what?

I do not know much about electronics, but I think I know enough to understand this...

I have been lately using the WS2801 driver to make something like an ambilight system for my PC screen using processing, an Arduino, SPI, WS2801, and RGB leds, I have 25 independant RGB LEDs to achieve a nice ambilight clone, but this... how does it work!?!?! I did read the TM1640 sheet, but I still do not get it.

PLEASE!!! some one explain me!!

Thanks in advance!!
9  Using Arduino / Installation & Troubleshooting / Mega 1280 power suply auto select on: October 14, 2011, 04:46:05 am
Hi all!

I have an Arduino Mega 1280, and I have read that the power suply is automatically selected, using the external PSU if conected and the usb suply if not.
But, if I have something connected that uses a lot of power, using an external suply, and this PSU breaks, the arduino will be using the usb suply, and I could break my mother board... Am I right?

I will be using just the USB to get data form the PC, and then 3 digital pins to feed some shift registers. Maybe I should leave the arduino being suplied through the usb and suply the other board (the one with the shift registers) through the external PSU, and  then just connect the grounds on the usb and on the external psu?

Or how should I do it?

Thanks in advance!!
10  Forum 2005-2010 (read only) / Español / Cargar código por USB on: March 18, 2010, 07:17:41 am
Hola a todos!!

Soy nuevo en esto del arduino, aun no tengo uno, pero me puede venir muy bien para algunos proyectos.

Tengo un problema, y es que mi ordenador no dispone de puerto serie (puerto COM) ni en el backplate, ni tampoco tengo la posibilidad de poner un latiguillo desde la placa base. Vamos que la única posibilidad sería comprar una placa PCI con salida COM, o sino un adaptador de USB a COM.

Mi duda es, cuando termino de escribir mi código y lo compilo y lo voy a cargar en el arduino, este proceso se tiene que hacer sí o sí por el puerto serie COM o se puede hacer por el USB en la versión USB del arduíno?
O el puerto USB en el arduino USB es solo para la comunicación entre el ordenador y el arduino pero no para cargar el código compilado del PC al arduino?
En el último caso, con un adaptador/conversor de estos USB puerto serie me valdría? Porque también he leído que estos adaptadores meten mucho delay en la señal y al final, en ocasiones no valen...

Muchas gracias y un saludo!!
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