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LED node and addressable led strips

Added by TranceGeniK over 5 years ago

Hi,

I’m a little newbie in the electronics world, but trying to make some things by myself. I’ve recently purchased a LED node to control led strips and it’s really fun.
Now I want to control an addressable led strip the same way but it seems to be a little more complicated. As I understand, the LED node runs at 12v, and the classic jeenode runs at 3,3v. Is there an easy way to control WS2811 led strips with jeenodes ?


Replies (10)

RE: LED node and addressable led strips - Added by TranceGeniK over 5 years ago

Thanks for the tip, but I might not have well expressed my needs. I’m more concerned about the hardware parts and the voltage handling than the software which I think will be the same for all of the arduino based cards.

RE: LED node and addressable led strips - Added by martynj over 5 years ago

Do you have a link for the spec sheet for the WS2811?

RE: LED node and addressable led strips - Added by TranceGeniK over 5 years ago

http://www.adafruit.com/products/1376\#Description

This is the kind of strips I’d like to use. Not this one because it’s expensive but it will be the same tech inside. I think you can find all informations in this site and this guide : http://learn.adafruit.com/adafruit-neopixel-uberguide

RE: LED node and addressable led strips - Added by martynj about 5 years ago

A quick look at other’s attempts at this show a couple of issues - the LED expects a 5V supply, but the Jeenode can only drive a 3.3V output. This is enough to indicate a logic high but shows up the second issue. To keep up with the pulse timing needed, it is right on the limit of what the ATMega can handle. The various drivers out there just succeed, but need to turn off interrupts so there is no way to run the LED’s AND talk across the radio.

RE: LED node and addressable led strips - Added by TranceGeniK about 5 years ago

I have looked for other’s attempts but couldn’t find anything. Could you please provide me a place to search for these ?

Would you think it would be possible to do this with another arduino and a RFM12B board attached to it in order to communicate with it from a jeelink ?

RE: LED node and addressable led strips - Added by martynj about 5 years ago

http://www.insomnia.org/led/documentation/rgbpxws2811.html

Sure - the Arduino will put you in a 5V world - but of course the processor is still the same speed.

RE: LED node and addressable led strips - Added by TranceGeniK about 5 years ago

So, if I want LED and radio, could I use an Arduino DUE which clock speed is 7 times faster ?

http://store.arduino.cc/index.php?main\_page=product\_info&cPath=11&products\_id=243

RE: LED node and addressable led strips - Added by martynj about 5 years ago

The faster clock will help a lot, but the drivers out there from Googling would need some modification since they turn off ALL interrupts while processing the output stream to the LED’s.   

The Aurduino you mention is also a 3.3V device. I suggest you connect up just one LED or a short string and check that the 3.3V drive is sufficient for the control pin.

RE: LED node and addressable led strips - Added by TranceGeniK about 5 years ago

After some researches, it seems that it would be possible http://forum.arduino.cc/index.php?topic=132750.0

I think I will begin by trying to control colors and then the radio.

Thank you for these tips and merry jeeXmas !

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