SPI bus length?
but the motor magnets (which move within the project as the project
moves over Earth) disturb the compass in a complex manner that would, I
expect, be very difficult to correct. I plan on mounting the compass on
an arm that would remove it from the motors.
The CMPS03 uses I2C; the V2Xe uses SPI. It appears that I2C signalling
can run some appreciable distance and should not be problematic over a
few feet, and I expect that slow, bit-banged SPI would be similar over
the same run. But what about the processor SPI bus? How much wire can
hang on it before the processor starts coughing?