I've been looking through the schematics for the various Prop boards out there.
All have pull up resistors on the SDA line but only some have pull ups on the SCL line. These are usually 10K resistors but I note that one board uses 4.7K on both the SCL and SDA lines.
The P8X32A Datasheet shows a 10K pull up on the SDA line only so I'm guessing that is probably a safe way to go?
Why wouldn't the application of resistors be consistent across the various designs?
Alexander (Sandy) Hapgood