Anyone here familiar with the F4 V5 PRO flight controller? (this one: https://www.banggood.com/F4-V5PRO-Flight...36342.html )

My question is how to connect an external current sensonr to the F4 V5 PRO? I have a Racerstar 4in1 30A ESC with integrated current sensor. I'd like to use the ESC current sensor instead of the FC (that way the FC board doesnt have to handle +120A of cutrent) Sadly, the FC does not have any current sensor input (unlike the F3s). I am using Betaflight, by the way.

On the flight controller there's a circuit that measures the voltage drop over the shunt resistor in the flight controller's current sensor. I can't see where it is from the pictures on the Banggood site, but if you work out which pin of the flight controller's MCU is assigned to read the current sensor input, you should be able to back track from the MCU pin to find the circuitry that implements the current sensor on the flight controller.

Once you can identify where the signal comes from, you would have to cut the track on the PCB that connects the MCU to the onboard sensor. With that disabled, you can connect the current sensor output from the 4-in-1 ESC to that pin on the MCU.

It doesn't say on the Banggood page what target is flashed to this flight controller, but I'm sure you know which target it is seeing as you have one. If you look at the file 'target.h' in the Betaflight source for that particular target, you will see which ADC is assigned to read the current sensor's voltage. If you then download the datasheet for the MCU, you can find out which physical MCU pin that ADC is located on.

I hope that makes sense and is helpful to you!

Thanks, unseen! It does make sense, but I guess I don't wanna risk bricking both the FC and the ESC if I mess something up. So, instead I will parallel connect the 4-in-1 ESC to all the solderpads on the FC thereby dividing the current load to the same levels as with four individual ESCs. I hope that makes sense 

(06-Jun-2017, 07:07 PM)copterella Wrote: Thanks, unseen! It does make sense, but I guess I don't wanna risk bricking both the FC and the ESC if I mess something up. So, instead I will parallel connect the 4-in-1 ESC to all the solderpads on the FC thereby dividing the current load to the same levels as with four individual ESCs. I hope that makes sense 

You don't have to do that. Just solder a thick wire to the inboard side of the shunt resistor on the flight controller and feed the ESC board from that wire. The negative connection can be a thick wire from the XT60 plug's negative pin where it goes into the flight controller.