Rotor Speed Control Setup — Copter documentation (ardupilot.org)
RPM Measurement — Copter documentation (ardupilot.org)
please help me，how to setup helicopter rpm。
i do not understand this “Reduce the PWM count to free up a pin to be used for GPIO. On non-Pixhawk boards the PWM count will include all PWM outputs. On Pixhawk boards this parameter only affects AUX pins. Write the parameter and reboot the autopilot”
my hardware is CUAV x7 pro ，and arducopter 4.3.7