en:modellbau:tips:kk47xcopter_issue

KK Xcopter 4.7 issue

There is a problem with the motor 4 signal on the Xcopter 4.7 firmware from kapteinKuk. To solve it I will post here some PWM readings I did with my logic analyser.

I used my Futaba T10 with Frsky module using a V8 7-channel receiver. The value of the throttle channel was set in the servo monitor of the TX, so I was able to set the value every time the same. I recorded the output of M1-M4 and the throttle input signals with a logic analyser, 1 million samples at 50kHz. The PWM signal had a accuracy of +-2%. I used two boards to do the first experiment:

  • board1 kk 5.5 brand new, from GLB. ATmega168p.
  • board2 kk 5.5 recently flashed, broken Yaw gyro, from GLB. ATmega168p.
  • board3 kk 5.5 brand new, from kkmulticopter.com. ATmega328p.

Tested firmwares are:

  • KK Quadrocopter 4.7
  • kk XCopter 4.7
  • KKAJ XCopter 1.1.2

PWM refresh of M1-M4: 299.4 Hz

<columns 100% 33% →

board1
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92
25% -62 1.26 1.12 1.28 1.10 1.10
50% 0 1.52 1.38 1.52 1.34 1.20
75% 63 1.78 1.62 1.78 1.60 1.44
100% 125 2.04 1.88 2.00 1.86 1.68

<newcolumn>

board2
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92 1.16 1.08 1.18 1.08 1.08
25% -62 1.28 1.14 1.32 1.10 1.08
50% 0 1.54 1.38 1.58 1.38 1.18
75% 63 1.78 1.64 1.82 1.60 1.42
100% 125

<newcolumn>

board3
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92 1.14 1.02 1.02 1.02 1.02
25% -62 1.26 1.16 1.18 1.12 1.12
50% 0 1.52 1.36 1.48 1.36 1.24
75% 63 1.78 1.64 1.74 1.62 1.48
100% 125

</columns>

PWM refresh of M1-M4: n Hz

<columns 100% 33% →

board1
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92 1.16 1.02 1.02 1.02 1.02
25% -62 1.26 1.22 1.18 1.18 1.10
50% 0 1.50 1.48 1.44 1.42 1.10
75% 63 1.78 1.74 1.70 1.68 1.38

<newcolumn>

board2
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92 1.14 1.12 1.10 1.08 1.08
25% -62 1.28 1.26 1.24 1.20 1.08
50% 0 1.54 1.50 1.50 1.48 1.10
75% 63 1.78 1.74 1.74 1.72 1.30

<newcolumn>

board3
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92 1.14 1.02 1.02 1.02 1.02
25% -62 1.26 1.12 1.26 1.12 1.12
50% 0 1.54 1.34 1.56 1.30 1.32
75% 63 1.80 1.62 1.76 1.58 1.52

</columns>

PWM refresh of M1-M4: 256 Hz

board1
TX KK board
Stick posThr valueThr valueM1M2M3M4
12% -92 1.16 1.02 1.02 1.02 1.02
25% -62 1.28 1.22 1.20 1.20 1.10
50% 0 1.54 1.42 1.40 1.40 1.30
75% 63 1.78 1.64 1.64 1.64 1.54
Diese Website verwendet Cookies. Durch die Nutzung der Website stimmen Sie dem Speichern von Cookies auf Ihrem Computer zu. Außerdem bestätigen Sie, dass Sie unsere Datenschutzbestimmungen gelesen und verstanden haben. Wenn Sie nicht einverstanden sind, verlassen Sie die Website.Weitere Information
  • en/modellbau/tips/kk47xcopter_issue.txt
  • Zuletzt geändert: 2020/11/01 16:40
  • (Externe Bearbeitung)