Strongly recommended · for some experience

Project YMFC-3D - Your Multicopter Flight Controller

Joop Brokking Playlist

Why people recommend it

Joop Brokking's series on building an Arduino quadcopter flight controller, rated very highly for clear explanations and followed by people who have completed working builds.

Watch for: Expect time on PID tuning; the ATmega328 is near its limits

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