First Flight Auto Analysis question

Ground Control Software Mission Planner
1

I’m converting an Parallax ELEV8-V3 quadcopter to a Pixhawk 2.1 flight controller. This is the first flight analysis.

I don’t understand 2 lines:

Test: Parameters = FAIL - ‘THR_MIN’ not found
Test: PM = WARN - 3 slow loop lines found, max 8.45% on line 61929

---- Here is the entire result —
Log File C:\Users\kenmc\AppData\Local\Temp\tmpC2B8.tmp.log
Size (kb) 6214.4814453125
No of lines 71853
Duration 0:04:12
Vehicletype ArduCopter
Firmware Version V3.5.4
Firmware Hash 284349c3
Hardware Type
Free Mem 0
Skipped Lines 0
Test: Autotune = UNKNOWN - No ATUN log data
Test: Brownout = GOOD -
Test: Compass = GOOD - mag_field interference within limits (5.12%)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = GOOD -
Test: GPS = GOOD -
Test: IMU Mismatch = GOOD - (Mismatch: 0.27, WARN: 0.75, FAIL: 1.50)
Test: Motor Balance = GOOD - Motor channel averages = [1421, 1417, 1410, 1411]
Average motor output = 1414
Difference between min and max motor averages = 11
Test: NaNs = GOOD -
Test: OpticalFlow = FAIL - FAIL: no optical flow data

Test: Parameters = FAIL - ‘THR_MIN’ not found
Test: PM = WARN - 3 slow loop lines found, max 8.45% on line 61929
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = UNKNOWN - No CURR log data

Thanks for any help.

KenMc

2

I’m a bit fuzzy on those lines too but from what I understand:

  • THR_MIN is leftover from older versions of Arducopter and can be safely ignored. It refers to the lower deadzone of your throttle, which you should tune but not with that parameter. Even if you have tuned it that warning will still appear.
  • Slow loop refers to iterations of the control loop that took longer than normal (ie: Pixhawk bogged down for a fraction of a second). A few of those are normal, not something to worry about unless it’s a high number.
3

Hi, we also faced a similar issue. Do you know what is considered as high for slow loops?