I have a problem with SD21 servo controller. It is probably D.O.A., but it is more likely that I am missing something with the wiring. As this is a first of a kind part for me, I can't be sure of anything.
It's connected to Duemilanove, pins 4 and 5, as I2C device should be, but I2C scanner program doesn't see it, my other devices are found nicely. I have tried this with and without pull-ups, no change.
Controller seems to be alive when I connect servos, they are moved to their center position as expected.
I tried also different ways to power it, external power is used normally for servos.
Control command have no effects, so... maybe it is the interface? This is my first "broken" piece of the puzzle I have got so far.
Any ideas how to test more?