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Author Topic: questions about chaining RGB LED+servo modules using WS2801 chips.. control?  (Read 3969 times)
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Thanks mrboni,
After hours of failures to run the Artnet code snippet with "Arduino Uno+Ethernet shield, using Arduino 1.0 and 1.0.1". seems like a serious UDP problem in Arduino.

When I took the code of Artnet example from:
http://vvvv.org/contribution/artnet-arduino-set-v2
and ran it on Arduino Uno+Ethernet shield, using Arduino 0.23,
things started working. Although it still seems that the arduino Uno hang after a minute or two.

I will try both versions of the code, on Arduino Mega.
Thanks!

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BTW, to test ArtNet DMX, I am sending ArtNet data using the free windows utility "ENTTEC node management utility (NMU)"

http://www.enttec.com/index.php?main_menu=Products&pn=79001&show=description&name=nmu%28nodemanagement%29
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Hi. I had the same problem. Seems the UNO can't handle the volume of data. The Mega works fine though
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The symptoms of having the WS2801 strip stop responding after few seconds seems very similar to post
http://arduino.cc/forum/index.php?topic=96115.0

As for now, I have managed to send ArtNet to Uno+Ethernet: built on Arduino 1.0.1
I have it running here for hours on 50 LEDs (which is 150 channels)
tested with "DMX-Workshop", "Node Managment Utility" and "MADRIX"

The major code changes I made are related to memory consumptions.
either decrease the udp packet size
#define UDP_PACKET_MAX_SIZE 512 // originally was 2048
or decrease the channels number
const int number_of_channels=512; //512 for 512 channels

I also moved the strip.setPixelColor line inside the If "if its an artnet header"
this will make sure that the strip.setPixelColor is not running for every UDP packet arrives.
I will post the whole code once I am sure it is running stable.

My challenge is to send ArtNet DMX data to 1250 WS2801 leds using Arduino+Ethernet shield.
Looking at the current numbers of memory, and having the fact that the Uno could not handle the program once I increased the UDP_PACKET_MAX_SIZE it seems like I must use this program on arduino Mega.
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