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A comment on Turning GE Color Effects G-35 Christmas Lights into a 7x7 display with Arduino. Parent comment

Re:Turning GE Color Effects G-35 Christmas Lights into a 7x7... by jgrahamc on Monday November 07, 2011 @09:12AM (#3206278)
No, I did not keep the in the same order. In fact when the LEDs power up they are waiting for the first packet to arrive and they will use the address in that packet to set the address for that LED. Until an LED has received its first packet it will not forward packets on.

So that allows you to program the LEDs with arbitrary addresses. I make use of this to program addresses that are easy to encode for the 7x7 display (each address is six bits so I use 3 bits for X and 3 bits for Y). This is complicated by the physical snaking layout on the board. See the code sample in the blog post for how this works.

https://github.com/jgrahamc/gece/blob/master/gece/protocol.c...

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Re:Turning GE Color Effects G-35 Christmas Lights into a 7x7... by jroseattle on Monday November 07, 2011 @09:19AM (#3206307)
Good to know. Was going to hack up a set of these post-Christmas, and was under the impression that order of the LEDs needed to be maintained -- as if the addresses we're hardwired.

Thanks for the post.

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