I am trying to observe both the SCL and SDA pins on an Arduino Pro Mini on an oscilloscope. When I have a sensor connected (AK09970N) the serial clock seems to have about a 66% duty cycle where I expect a 50% duty cycle. When I disconnect the sensor, however, I get no cycles. Does this mean that the clock for SCL is generated by the sensor? If not, can I observe the clock generated by the Arduino?
I have used the blink example to ensure that the clock is running as expected.