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6. Wait for your ESCs to emit the musical tone, the regular number of beeps indicating your battery’s cell
count (i.e. 3 for 3S, 4 for 4S) and then an additional two beeps to indicate that the maximum throttle has been
captured.
7. Pull the transmitter’s throttle stick down to its minimum position.
8. The ESCs should then emit a long tone indicating that the minimum throttle has been captured and the
calibration is complete.
9. If the long tone indicating successful calibration was heard, the ESCs are “live” now and if you raise the
throttle a bit they should spin. Test that the motors spin by raising the throttle a bit and then lowering it again.
10. Set the throttle to minimum and disconnect the battery to exit ESC-calibration mode.
5.5 Level Calibration
If the Mission Planner shows the drone not level when you put it horizontal as this picture, You can setup as
below to solve the problem.
Under Initial Setup--Mandatory Hardware--select Accel Calibration from the left-side menu--Click Calibrate
Level to start the calibration.