I2c and oscilloscope

Projects Networking, Protocols, and Devices
1

Just got a present - a Siglent SDS 1104X-e oscilloscope.

Tried to use it to decode I2C communication by following the user manual and videos on Youtube. But I cannot get anything out of it.

In the picture below you can see there is a yellow warning under the I2C column and "No data" in the Time column.

I have searched for a solution/explanation but without success. So I was hoping someone on this forum may have any solution on this?

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(BTW, tried to get a picture when there was data on the bus, but that was not easy. Will try again later).

In case the picture does not show up, you and find it here.

2

first obvious question: are the scope input and the Arduino on the same ground?

3

Yes. Both probes are connected to arduino ground.

The pictures is not the best since I the mobile to too slow to take a picture at the right moment. But I have seen nice curves from both SCL and SDA.

I'll will try to take a better picture later.