[Bug] Possible Power Module Issue — Battery Reading Fluctuations and Arming Failure on Pixhawk 4 #25824
Description
Describe the bug
Platform:
- Frame: Holybro S500
- Flight Controller: Pixhawk 4
- Ground Station: QGroundControl
- OS: Windows 10
- Firmware version: v1.11.0-rc3 (with custom modifications to RateControl)
Description
I’m experiencing an issue that prevents me from testing my modified firmware.
An error message appears "Arming denied, Connect Power Module"
At the same time, the battery status alternates between showing a correct (or approximate) reading and displaying "--.–%"
When the voltage percentage displays "--.–%", the quadrotor won’t arm.
When it does show a valid reading, it sometimes arms, but only one rotor starts spinning at first.
Additionally, the controller connection is unstable — sometimes it connects properly, but other times I need to restart the vehicle to reconnect.
I tried calibrating the voltage divider, but when no valid voltage reading is detected, the calibration cannot compute a proper value
Could this indicate a faulty power module?
If so, how can I test or confirm that the power module is defective?
To Reproduce
drone in altitude mode.
connected with a 3s LiPo batery. at 11.55V
Expected behavior
no issue at arming and all four rotor starting spinning at the same time to start testing parameters.
Screenshot / Media
Flight Log
No response
Software Version
Firmware version: v1.11.0-rc3
Flight controller
pixhawk 4
Vehicle type
Multicopter
How are the different components wired up (including port information)
Power connected at Power 1
Telemetry Radio connected to Telem1
Radio receiver connected to DSM/SBUS RC
GPS connected to GPS MODULE
power module connected to I/O pwm out
Additional context
No response