Current Sensor Calibration in INAV Betaflight and more

Current Sensor Calculator: www.mrd-rc.com...
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[@divingfalconfpv4602]

inav never reads amp right on any of my drones. i can calibrate BF no issues everytime. iNAV just doesnt work.

[@MmmBbbb-u1x]

Hi Marc, I have an Omnibus F4 Pro v3 and although I have tested the method with the power meter (I did it before seeing your video) and on the bench I had 100% accuracy when battery was full in all the possible throttle positions, in the real flight I had a huge difference. My OSD showed 2454mAh but my charger put 1551mAh. So I'm afraid this method is not valid in my case. I suppose the problem is in the hardware. Probably they have powered the Opamp on the shunt resistor directly from the battery voltage, so when the voltage drops, the voltage reference and the readings drop too. I haven't checked the omnibus circuit yet but this is the only explaination I can give. So for now I'll start calculating the coefficient by the difference between the OSD and the charger. I hate this method too but what is important is to have the correct total in the air to know how much energy is left. If the opamp is powered directly from the battery voltage I will need to modify the circuit to power it up from the 5V of the board... If this is not the case and the circuit is fine then the only thing I can think is that the temperature of the shunt resistor increases in flight and thus produces higher readings. If you have any other ideas of what is so wrong in my case please tell.

[@cobra4829]

more than perfect video
thanks

[@IanF-FPV]

Yeah a watt meter is a must have for fixed wings. Thanks Marc.

[@OliFPV]

Sehr gut 🤟💚 greetings

[@IAmTheCraftsman]

Thanks for this video! I have everything set up and once I arm, my quad idles fine. When I go to increase to throttle to throttle level 2, my motors ramp up and continue to ramp up well past throttle level 2. I have Airmode enabled on horizon and acro, but not in angle. I am in angle doing this test with props on. The drone is secured to my workbench.
Any ideas on why I’m unable to move thru the throttle range without the “spool up” of the motors once I go past about 10% throttle?

[@MarcFPV]

In quads the pid controller will freak out when it's not moving. You need to go into cinfugurator and then in the outputs tab to manually control the motors.

[@IAmTheCraftsman]

@@MarcFPV I tried using the motors tab on the SpeedyBee app. I’m able to spin the motors up using the sliders or the + and - buttons. The current draw does not change in the app. It stays at .21. The current draw increases on the power meter.

[@MarcFPV]

@@IAmTheCraftsman that might be a problem with the SpeedyBee app then. Maybe try the official configurator instead.

[@IAmTheCraftsman]

@@MarcFPV got it done! I did as you suggested and Bluetooth’d from my laptop using the full configurator.
Before I took your advice, I researched how to do this using the mah used, mah replaced method. Oscar Liang has a webpage that details how to calibrate the current sensor three ways.
-The mah used, mah replaced method
- A method that involves a multimeter and removed props
- A method involving a power meter with props on
While describing the power meter method, Oscar mentioned swapping the props side to side on the front motors and side to side on the rear motors so that the props produce negative thrust instead of positive thrust like they normally do.
That didn’t occur to me to do that.
I was trying to figure out how I was going to hold my quad down with one hand when manipulating the slider and writing down values on a piece of paper with the other… 😂
Recipe for disaster!!!
Thanks again for the video and your personal attention in the comments!

[@AerialWaviator]

A great reference video.
As is pointed out, it's important to measure current at similar battery loading to that being used in flight. Cruise throttle setting would be a good reference point.
Typical battery charging currents (charge/discharge) are much less than amps consumed while flying,, so battery is not working as hard (no voltage sag, etc). Battery capacity measured at low currents will always be greater than if the battery is under stress of higher currents. Higher C-rated and newer batteries show less variation in actual vs their capacity specification.
Better to test with partially discharged pack, or near storage voltage, as fully charged pack will have higher voltage, and thus consume lower current for given power level vs. when pack has mostly discharged.

[@MarcFPV]

Hey, thanks for the input. But it is not fully correct. The current sensor completey ignores the voltage. It only measures the actual current flowing. The voltage or voltage sag does not matter at all. Of course in flight the power will drop on lower battery voltage but the current alone can be measured at the same time correctly. So all that matters here is the realtime comparison between a calibrated current sensor to the FC current sensor.