Matek F405-STD Wrong Motor Numbers?

ArduCopter
1

Hi guys,

I’m running the latest 3.7.0 on my Matek F405-STD H-frame. All motors spin the right direction and my props are correct orientation to make lift. Unfortunately on acro it flips on taking off.

When I go to motor test tab and check each motor individually (A, B, C, and D) the wrong motors spin each time (comparing to reference on Wiki that says Motor A = 1, B = 4, C = 2, D = 3, on H frame). I’ve tried changing servo1,2,3,4 to 33,34,35,36 to try to get the matching motor to spin but I can never get it right. I’m I doing something wrong here? What could it be.

2

Is the board orientation correct? Check in Mission Planner HUD that it’s responding correctly to pitch and roll is the easiest way to check. I had this same issue with an Omnibus F4 Nano and the way I mounted it. Other than that it’s just re-assigning the servo outs as you are doing.

3

Yep, board responds well - compared it to another drone of mine on MP for sanity check. The drone was flying fine on INAV, unfortunately after spending an hour reassigning servo outputs they just kept changing on me.

4

Which motors correlate to A,B,C,D in motor test?

5

it starts at the front for a + or front right for x and goes clockwise

6

Yea I know, I was asking which motors on his craft spin when A,B,C,D are selected.

7

Letter - motor #

My craft:

A - 4, B - 3, C - 1, D - 2

Sample craft:

A - 1, B - 4, C - 2, D - 3

So I deducted that Servo 4 should be set to whatever servo motor A (motor 1) was currently spinning, so I set Servo 4 = 33 (motor 1) and so on

8

Assuming the “My craft” was at default try this:
SERVO01_FUNCTION 36
SERVO02_FUNCTION 33
SERVO03_FUNCTION 34
SERVO04_FUNCTION 35

9

Dave, I plugged the params in and it now flies like a dream. What kind of sorcery did you do good sir? Thank you!

10

Happy to here it Rolando! That’s the same feeling I got when I figured out the motor order on an F4 nano and an F7 Kakute AIO. I used scratchpad analysis!! :grinning:

Motor%20order
Motor order.jpg2016×1512 255 KB

11

I did the same thing, but ahhhhh, I see what you did. I was trying to map ‘A’ / ‘motor 1’ to a pin. You mapped a pin to the motor, so backwards, that makes sense! Thanks again.

12

Can you point me in the right direction so I might get my brain around this? When setting up an Omnibusf4 nano v.6 on a 4 channel plane, I was able to get things working correctly only once, but after re-boot it no longer worked correctly.

13

So you have Servo 1-4 as AETR I suppose? I would just connect a servo to each of the 4 outputs (M1-M4) and use the Tx to determine which output correspond with which function.