External FC Gain – Gain value for matching the gimbal data from your flight controller
(optional). For better stabilization and utilization of some additional features, the knowledge
about the frame inclination angles is required. SimpleBGC IMU doesn't provide such
information. Most of FC have servo outs for connecting gimbals. This outs should be connected
to SimpleBGC controller through EXT_ROLL and EXT_PITCH inputs.
◦ Activate gimbal outs in FC and set range limits for angles you generally fly (for example ,+-
30 degrees of frame inclination should equals full servo range about 1000-2000).
◦ Deactivate all filters and smoothing of FC gimbal settings (if present).
◦ In the RC-settings tab, make sure that inputs EXT_ROLL, EXT_PITCH doesn't used to
control gimbal. (i.e. are not chosen as source for any other RC control task).
◦ In REALTIME DATA tab, check availability of EXT_FC_ROLL, EXT_FC_PITCH signals, and
make sure they are split to axes correctly. (Frame roll angle tilting should cause
EXT_FC_ROLL change in approximately 900..2100 range. The same is for pitch.)
◦ Connect power supply, and setup stabilization as described above (tune POWER, INVERT,
PID)
◦ Push AUTO button in FLIGHT CONTROL GAIN group, and smoothly incline copter frame
to different directions by all axes for 10-30 seconds.
◦ Push AUTO button again to complete calibration. (Calibration will stop automatically after
some time too). New gains will be written into EEPROM and shown in the GUI.
NOTE : You may skip this step and leave zero values at initial setup.