PX4 measures different avionics and battery voltage from multimeter

Pixhawk
1

I am using a Pixhawk MINI with its default power module.

I was about to arm my pixhawk and it threw me an error message “Avionics power low: 4.78 volts”. I googled this error and apparently it is about the voltage input to pixhawk. Then I used a multimeter to directly measure the voltage input from the power module to pixhawk, and the multimeter gave me 5.394 volts.

So I am wondering, why the software is reading a different value from multimeter, and this power low is preventing me from arming?

Second, I noticed the measured LiPo battery voltage is also quite off from the multimeter reading. I thought the power module has a voltage sensor and current sensor, why the sensed voltage is so incorrect?

2

Hi,

where did you get the Pixhawk Mini from. Usually Chinese products deviate from the HW Standard and this may explain why you get a too low voltage measurement.

What Kind of Power Module are you using? This must be calibrated, for details check: https://docs.px4.io/en/config/battery.html