Hi all,
I have started playing with my new RGB led strip, and curiously enough, it lights up even without the +5V line connected. :o
I'm following this tutorial for wiring, and using the LPD8806 library from the same site.
I simplified the sample code to have just a single running light, and it works as it should in SPI mode. In non-SPI mode (with pin 2 and 3 for data and clock, respectively) the behavior is erratic. Not completely random, but not the expected either.
But what puzzles me the most is that all this happens with only three wires of the strip being connected: data in, clock in, and ground. No power.
How is it working at?