Disable the safety switch on Pixhawk
On Pixhawk and all other flight controllers based on PX4, like HKPilot32 or AUAV-X2, you should press the safety switch button before arming. This is a safety feature and its recommended to be enabled. If you don’t need this feature, you can disable the safety switch.
Open Mission Planner, connect the Pixhawk and go to the “Config/Tuning”-Tab. Then click on the “Full Parameter List”. On the right side there is a “Find”-button. Click and type safety. You should get this result:
Change the value from “1” to “0” and then click on “Write Params”. That’s it. Now you can use your Pixhawk board carefully without the safety switch.