Multiwii 2.0-pre - HexaX + SUMPPM problem on motor 5 ?

[mikob2d]

Hi,

I recently made an hexaocopter in X mode,

It was using MultiWii 1.9_dev_20120121.

With this configuration, that was fine:
RX SUM PPM on pin 2
Motor 5 on A0
Motor 6 on A1

(even if unoptimized with the A0 A1 hack, but i required it to use other pin for something else (softserial))

With this config, my hexa was flying pretty well =)

But , whatever the test i done with Multiwii2 (pre 1, 2 and 4 at least),
I allways got a problem with my two last motors.

Case#1 : With the A0 A1 hack
(Motors 5 & 6 on A0 ret A1 pins, RX Signal in PPM SUM)

Result: when i power up my FC, all my ESCs made bips quicker and quicker, pretty terrific. Looks like a bomb will explode ! xD
I asked what does it mean, people answer me that was the ESCs that received to high signal on powerup.
So it seems to not work with sum ppm & A0_A1 hack.

So i decided to test the "normal" way, with motors 5 & 6 on pins 5 & 6, without the A0_A1 mode.

Case#2 : Without the A0 A1 hack (and still in sum rx)
(Motors 5 & 6 on 5 and 6 pins, RX Signal in PPM SUM)

All Escs stop making bips crazy like in case #1, but the ESC on pin 5 doesn't seem to receive any signal (he make bps like when not connected to the FC).

I tried to put another esc on pin 5 to check if was ESC-related, but whatever the ESC i put on pin5 with v2, no one get signal !

Result: i got a doubt on my FC, maybe the pin5 doesn't work pretty well hardware way.

So i decided to reflash the 1.9 version, without the A0 A1 hack to check if motor 5 would work fine.

Result: And bingo, with the 1.9 dev version back, all worked pretty fine ! So it's not totally the pin 5 on my FC that don't work, good news !

Conclusion

-> Is there a problem with A0_A1 pins for HEX with sum ppm in v2 ?
-> Is there a software/hardware problem with my pin5 on my FC that could make it work with 1.9dev but not v2 ???

-> Did i do something wrong ?


Here is links for my Multiwii2 , Multiwii1.9 archives and configs.

My MW19_dev : http://dl.dropbox.com/u/15091039/MIKO_MultiWii_dev_20120121.zip
My MW2Pre4 : http://dl.dropbox.com/u/15091039/MIKO_MultiWii_2_0_preversion4.zip

Thanks for reading ! And thanks for this great software !

(And sorry for my eventually bad english !)

[Gaijin]

Have you set the MInCommand too low?

With a Hex if you set mincommand below 1000 motors 5 & 6 go high meaning they won't arm.

http://www.multiwii.com/forum/viewtopic.php?f=8&t=1290&start=140

Try this, connect to gui and use subtrim and end points on your radio to ensure your outputs are between 1000 & 2000, then connect the esc's to your receiver and calibrate the throttle range (safe in the knowledge it will match Multii's range).

When I first calibrated I used a servo checker which overdrove the range and messed up the cal

Then check mincommand = 1000, if not re-upload the sketch and try it again!

Good luck

[Alexinparis]

Have you set the MInCommand too low?

With a Hex if you set mincommand below 1000 motors 5 & 6 go high meaning they won't arm.

http://www.multiwii.com/forum/viewtopic.php?f=8&t=1290&start=140

Try this, connect to gui and use subtrim and end points on your radio to ensure your outputs are between 1000 & 2000, then connect the esc's to your receiver and calibrate the throttle range (safe in the knowledge it will match Multii's range).

When I first calibrated I used a servo checker which overdrove the range and messed up the cal

Then check mincommand = 1000, if not re-upload the sketch and try it again!

Good luck

I suspect also the same problem

[mikob2d]

oh yeah, the mincommands are differents in my two version 1.9 and 2.0, i will check that (and my esc calibration too but since it was working in 1.9, i didn't suspect that was the cause of my problem) as soon as possible (when my accus will be charged) !

Thanks @AlexInParis, @Gaijin !
=)