The RPM sensor cannot be used on the CUAV v5 flight controller

The RPM sensor cannot be used on the CUAV v5 flight controller. The RPM sensor outputs a Hall signal. The configuration looks normal. The ground station keeps displaying rpm=3000. How to solve this problem? thanks

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Is your rpm sensor connected to the A3 header? Please note that you need to set BRD_PWM_COUNT to be small enough; for example, for A3, you need to set BRD_PWM_COUNT=2 or less

我把BRD_PWM_COUNT设为2意味着就输出两路pwm,那还怎么控制舵机?我现在已经设为2了,但是rpm显示的-1
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Hi. Did you manage to find the cause for the noise? I have a CUAV v3 & CUAV V5 and both have the same issue. After upgrading to Arducopter v4.3.3, I have a lot of noise using a Hall sensor for RPM. I am using a pull-up resistor. I also replace several Hall sensors, ad a 0.1uF ceramic filter but all without much improvement. It is powered from a 5v regulator for the sensor and signal.