Q1:After I powered on the autoquad, why the four motors "beeing" which indicates that there without any PWM OUT signals. That's why
P.S. Actually the ready LED was always solid which means the FC was armed.
I use FW.V.7.0-EXPR r416 b1794 HW.v.6R1.(It is original, which means I didn't flash firmware .)
I didn't do any calibration.(I think it is not the reason for the questions above)
Q2:Why was the data of UKF_altitude and GPSdata.height negative?(about -23.665)
P.S. Even when the gps was locked.(The blue LED was solid)
Q3:If the firmware V7.0 r416 only works with DIMU, I ask that question because when the DIMU v1.0 PCB was pulled up, only the power LED was solid.