@mkeyno wrote:
I bought 3.3 volt external compass QMC5883L and add its library on Arducopter version 3.2.1
my hardware is APM 1.0, and driver header files located at here however when edit config.h and ArduCopter.pde to make instant of driver, in calibration process in mission planner it says , it can read 3 date and error #99
any help really appreciated
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