PPM with CC3D flight controller

hii, i'm student and i need some help for cc3d and pwm signal.
i have create my drone with a reciver and now i want to remove reciver and use arduino to send pwm signal.
my project is a selfpilot dron providing obstacles ,so if u can help me please contact me :

The RC receiver will be sending signals to the CC3D using one of several methods such as one servo signal per channel, SBUS, PPM or maybe some other protocol. Which method are you using ?