I'm having a hell of a time figuring out how the battery voltage and current is supposed to work. Sure, the installation is straight forward and I get numbers that change. The problem is that they are not the right numbers:
- the first problem is that it appears that what the APM 2.6 is getting and what the MissionPlanner is getting are two different numbers: in particular, in the mission planner you can calibrate the sensor, while in the APM you cannot? I mean, it seems that whatever you can calibrate in the Mission Planner is kept in the Mission Planner and used to correct the voltage displayed on the screen rather than the one measured by the APM. Why is that a problem? Because the failsafe is set in the APM, so if the APM is 1V off (yes, that much!), then the failsafe is not doing its job.
- second problem is that it seems that in the latest version of the mission planner (2.**.85) the calibration of the 3DR sensor *voltage* has been disabled. Not sure why, but it is. The current can still be calibrated, but the measured voltage field has been disabled (was enabled in the previous version, and it is still enabled for "Other sensors").
- is there a way to calibrate a 3DR sensor in the APM? I looked a bit and there seem to be no parameters related to the voltage/current calibration in the APM list of parameters.
- is there a better sensor out there?