Hello,
I am interfacing DS3231 with Arduino using DS3231.h library, I got output on serial com port my question is that how to show I2C signal on oscilloscope?
Thank you.
Hook your scope up to the I2C pins?
Hi,
Using a standard scope will show you the signal pulses but not let you read the information on them.
You need a logic analyser scope or one of these to connect to your PC.
Tom... 
I use a logic analyzer like Tom showed with the Pulseview software to view I2C bus action.