As a matter of fact. Mr Murphy passed by my place last night! I just
finished re-writing the SPI bit-banging routine that I want to use to
interface my AD9834 DDS chip and hooked up my oscilloscope to the DDS board
and hit the *program DDS button* on my microcontroller board. When I tuned
my head to my scope I saw a beautiful sine wave on the screen when I heard a
knock on the door. I turned my head and Mr Murphy was standing in the
doorway. When I turned my head to my project I found that my SPI wires
weren't even connected to the DDS and that the ground of my scope was
floating: The sine on the scope was interference. I was about ready to cry
like a baby!

Sean.
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