Module SSD1306 Not working on Pixhawk 2.1

If you look at the GPS 1 pins ,you have got to solder wires to pin 1 ,4,5and 8 in order to work. Only GPS1 I2C.

This means that I2C port share the display and compas connected together?

yes,They share the same external bus.

Off topic but @mfbs17, that’s a slick looking machine you have there!

Thanks Randy ,I am waiting for some more test on the bench before I ll do the first test flight.

I believe there is an open issue to correct this to work on both busses.

It’s merged already actually. Hopefully we can get it to 3.5-rc3.

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That’s Awesome Oxinarf! Glad to see!

This issue should be marked resolved as of apm 3.5 rc3, another note for anyone finding this via search, it appears that most if not all i2c hardware can now be connected to either bus, I moved my lidar lite v3, and px4flow back to the second bus which previously was not working, and everything fired up happy as a clam…