We’ve been working hard programming all of the many settings in the KK2.1 needed to optimize the flight performance of our SK450 Dead Cat quadcopter. I think it is time for a nice easy step. Before we fly our quadcopter for the first time, it is a good precaution to make sure that all of the sensors onboard the KK2.1 are functioning correctly. This will hopefully help prevent the quadcopter from going crazy on takeoff and damaging itself or something else.
So, in the KK2.1 menu, navigate to the Sensor Test tool and press the Enter button. The KK2.1 has two types of sensors onboard: a 3-axis gyroscope, which senses the rotation of the craft around the roll, pitch, and yaw axes, and a 3-axis accelerometer, which senses acceleration of the craft in all three directions. The Sensor Test tool should list the three axes for these two sensors. You should, hopefully, see that the status for all six lines is listed as “OK.”
It is probably a good idea to run this sensor test from time to time, especially after a crash. Unfortunately, if, for whatever reason, one or more of your sensors fails the test, you don’t really have any options other than replacing the KK2.1 board. If your board is brand new, you should return it. I have never had a sensor fail though, even after some fairly serious crashes, so hopefully neither will you.