I have searched long and hard for how to use Emax Simonk ESC's with Pixhawk running the latest Arducopter. The problem is these ESC's have no response when connected to Pixhawk. From my research the native PX4 flight stack sends a 900us pulse at boot, which is what these ESC's seem to want/need, otherwise they timeout.. they appear to timeout using Arducopter only on Pixhawk but not on APM... if I have pixhawk powered by USB and booted and ready to arm, quickly plug in my battery and thus provide power to the esc's and arm they sometimes beep and start up. Does anyone know how to get Arducopter to send this 900us pulse on boot? If the native PX4 flight stack does it then it should not be hard to throw that code into Arducopter and fix some of these ESC "compatability" issues. As 3DR stated in posts all these ESC's work with the native flight stack.
Thanks for your help.