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Log analysis - Analysis Agriculture Quadcopter 10 L water spraying system


(Prateeksrivastav4) #1

Auto analysis:

Test: Autotune = UNKNOWN - No ATUN log data
Test: Brownout = GOOD -
Test: Compass = FAIL - WARN: Large compass offset params (X:-130.13, Y:-221.26, Z:-402.39)
WARN: Large compass offset in MAG data (X:-130.00, Y:-221.00, Z:-402.00)
Large change in mag_field (598.23%)
Min mag field length (82.95) < recommended (120.00)
Max mag field length (579.19) > recommended (550.00)
Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = GOOD -
Test: GPS = GOOD -
Test: IMU Mismatch = GOOD - (Mismatch: 0.15, WARN: 0.75, FAIL: 1.50)
Test: Motor Balance = WARN - Motor channel averages = [1508, 1580, 1497, 1573]
Average motor output = 1539
Difference between min and max motor averages = 83
Test: NaNs = GOOD -
Test: Parameters = FAIL - ‘THR_MIN’ not found
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = UNKNOWN - ‘POWR’

Before Flying, In Lab I tested my drone using 12S12P Li-ion battery 48 volt 34800 mAh , I completed all the Calibration procedures (ESC calibration, Accelerometer & Compass calibration etc) using 12s12p Li-ion battery.
But on field for flying I used different battery -
Two set of 6s12p (22.2 V 34800 mAh) in series connection to maintain the same configuration of 12s12p.
After flying I did the log analysis, and found these errors:

  1. Test: Compass = FAIL - WARN: Large compass offset params (X:-130.13, Y:-221.26, Z:-402.39)
    WARN: Large compass offset in MAG data (X:-130.00, Y:-221.00, Z:-402.00)
    Large change in mag_field (598.23%)
  2. Test: Motor Balance = WARN - Motor channel averages = [1508, 1580, 1497, 1573]
  3. Test: VCC = UNKNOWN - ‘POWR’

My queries are -

  1. Can change of battery be the possible issue for all these above error ?
  2. If any other solution / suggestion, Please let me know ?

Thanks


(Tatiana Andreeva) #3

Hi @DTLPRATEEK,

It’s better to calibrate the compass again in the field.

Changing the battery hardly can affect the issue.
However, please check if you get the same warnings after calibration without changing the battery.