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en:modellbau:tips:kk47xcopter_issue [2017/04/13 18:26] (current)
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 +====== 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. ​
 +
 +===== How the experiment was done =====
 +
 +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
 +===== Results =====
 +
 +==== KK Quadrocopter 4.7 ====
 +PWM refresh of M1-M4: 299.4 Hz
 +
 +<columns 100% 33% ->
 +^board1^^^^^^^
 +^  TX  ^^  KK board  ^^^^^
 +^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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 pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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 pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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>​
 +==== KK XCopter 4.7 ====
 +PWM refresh of M1-M4: n Hz
 +
 +<columns 100% 33% ->
 +^board1^^^^^^^
 +^  TX  ^^  KK board  ^^^^^
 +^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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 pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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 pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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>​
 +==== KKAJ XCopter 1.1.2 ====
 +PWM refresh of M1-M4: 256 Hz
 +
 +^board1^^^^^^^
 +^  TX  ^^  KK board  ^^^^^
 +^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
 +|  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|
  
  • en/modellbau/tips/kk47xcopter_issue.txt
  • Last modified: 2017/04/13 18:26
  • (external edit)