Connect arduino and flight controller

Hi,

I'm trying to make a quadcopter drone. I want to make a drone which can move its frame. To operate the frame of the drone, I want to use the arduino. So I need to connect arduino and flight controller. And the flight controller will function as an main board of the drone. (the transmitter and receiver will be attached at the flight controller) Arduino should be able to send and get the data from the flight controller. Is this a possible model that I can make?

(I am not using the arduino as a flight controller. I will use Matek F405 CTR as my flight contorller)

My Questions:

  1. Can I connect the flight controller and the arduino?
  2. Can I write the code on the arduino to operate flight controller?
  3. How the flight controller and arduino send and receive the data?
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