Unable to detect compass on GPS-RTK2 Board - ZED-F9P for quadcopter running ArduPilot

GPS/GNSS Development Boards
1

Hello,

I’m pretty new to this space so please bear with me; my project involves a quadcopter with a Matek H743-SLIM flight controller running ArduPilot 4.4.0.

I’ve successfully connected GPS from the RTK2 board to the flight controller. A GPS signal is acquired and everything looks good there at the moment.

However I also noticed the SDA and SCL pins on the board and also wired those to the flight controller but the compass is not detected. My two assumptions are: (1) SDA and SCL designate the compass (2) the RTK2 board has a compass onboard.

I have another Holybro GPS RTK (w/ compass) and when I connect it to the same pins on the flight controller a compass is detected so it doesn’t appear to be an issue with the flight controller.

I attached an illustration of the wiring between the FC and RTK board.

Again, thanks for reading your patients and I’m beginning to step into this electronics space.

matek+rtk.png
matek+rtk.png619×896 562 KB

2

SDA and SCL are the data and clock lines for i2c communication

The f9p doesn’t have a strict ‘compass’, but you can calibrate the flight software to use one based on the GPS readings…this is somewhat similar https://discuss.ardupilot.org/t/about-c … -fit/77085 - maybe post there if you can’t get it going?

3

Thanks for the explanation!