Good morning.
I need help because I want to connect a Pixhawk with a Raspberry Pi3 and install QGround Control in the Raspberry to use it as a companion computer. I don’t know how to start, can someone help me?
Also, I don’t have a monitor to connect to the raspberry, I only have my Mac.
Thank you
Hi @Rachida, welcome to the forum 
There seems to have been some confusion here - QGroundControl is the “ground control” software that runs on your topside/surface computer (your Mac, in this case). The onboard/companion (Raspberry Pi) computer runs either our old Companion Software, or our new BlueOS software.
I would recommend you go through our Software Setup Guide, and come back with any questions you have afterwards