Wiring 2 current sensors to see only one [Used mAh] value in OSD (1 battery Quad Plane VTOL)

[Mr.1]

Hello guys, I am building a new quad plane VTOL and asking myself how to wire it correctly.

I want to see total used mAh in my OSD and Missionplanner but I have two current sensors. One in the Matek H743 Wing FC and one in the 4in1 ESC. Since I only will use the horizontal motor and the vertical motors for a very short period at the same time, I do not need to see the energy consumption seperately. But I need to see the total energy consumption always in my OSD and MP.

So I have two variants.

Variant 1: All power goes through the Matek FC. In case I will connect also the current sensor of the 4in1 ESC, how does the flight controller calculates the two power sources? Can it still only use the current from the FC to calculate used mAh? Or will Arduplane use both current values?

Variant 2: The FC (only powering the horizontal motor) and 4in1 ESCs are powered seperately so I need the data of both current sensors. Can Arduplane use both current as one? To see just one “Used mAh” in the OSD and MP?

I hope my drawing is good enough.
Thanks

Related topics I found that could not answer my question because they use two batteries:

Wiring Redundant Power Supplies

I’m in the final stages of building an octocopter around Pixhawk 2.1 and am just trying to sort out how to wire power. The craft is a Tarot X8 running the standard 40a esc/4114 320 motor/1555 props that Tarot recommends, along with a pair of 6S 8000mAh batteries carrying a Sony a6500 camera and gimbal. All up weight will be around 7kg and e-calc expects hover current around 40a with a maximum around 120a. Having had both motors and batteries fail in the air in the past, I’d like as much redun…

"DoubleBat" Power Supply For Quadplanes

Fifth flight with Arduplane Plane 3.9.0beta2: Rolf

[Rolf]

In principle, you can use both variants, take a closer look at the parameter BATT(x)_MONITOR: Complete Parameter List — Plane documentation

With variant 1, you will probably have BATT_MONITOR set to 4. The ESC telemetry does not influence the value at all unless you parameterise a battery with the ESC values as the source: BATTx_MONITOR = 9.
You can even define a battery with 10 (Sum Of Selected Monitors).

You can display the values of 2 batteries in the OSD.

So good luck with the settings, no matter which variant you choose.

Rolf

[Mr.1]

Thanks for your quick reply.
So when I use variant 2 and want to see only one value for Current and used mAh in my OSD/MP, I just have to set BATT_MONITOR = 10 and BATT2_MONITOR = 10?

Or do I have to define a third monitor to sum both sensors?

Which parameter do I have to set nin the OSD then? BATUSED or BAT2USED?

[Rolf]

I would try it like this (but I haven’t tried it myself yet):

BATT_MONITOR , 10 (Sum Of Selected Monitors)
BATT2_MONITOR, 9 (ESC)
BATT3_MONITOR, 4 (Volt+Amp from FC)

[Mr.1]

Thanks I will try this because I don’t like the idea that all the power goes through the FC (variant 1)