====== 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
^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|
^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| | | | | |
^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| | | | | |
==== KK XCopter 4.7 ====
PWM refresh of M1-M4: n 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| 1.26| 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|
^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|
^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|
==== 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|