Futaba GV-1/701 RPM sensor stopped working in 4.0

[bnsgeyer (Bill Geyer)]

@jinchengde I suggest you read this thread

RPM Sensor Wiki - Knowledge Share

Hi all, I want to write the Wiki for using RPM sensors. I don’t know everything about implementing the various sensors on the various flight controllers out there. So I am creating this thread to encourage others to share their own knowledge and tips. Also, if I have made a mistake in the information I have written below, please do point it out. I will then collate all of the information into a Wiki page. What I know so far: In principle, any rpm sensor that outputs a PWM signal can be us…

And maybe @IAMMATT might be able to help with this question.