After having my rev1 board sitting in a box for many months, finally I have found some time and decided to put it on our “labquad” prior of using it for one of my bigger octos.
I have loaded fw 6.7 b1400 and done the static calibrations which had beautiful curves, much better than my precious ones done last year with my first rev 0.
Everything was ready for the calibso, I mounted the board on the quad, setup the limits on the radio and checked on the GUI that radio connections was fine, all OK. Quad had props on (normally I remove them)) but I simply wanted to test if the board was arming and give some throttle just to check if props directions where correct, arm give some throttle and everything seemed fine…..until all controls started to move randomly making the quad to take-off and hit the wall. Even after catching it and throttle completely cut the motors were still accelerating. There was some kind of issue with ppm.
I decided to take out the board and do some tests with the AQ and my radio on the bench with everything unplugged and minimizing any possible interference with ESC´S and other devices, but unfortunately sooner or latter I was always able to reproduce the problem, at some point all channels get out of control.
I did the following changes but unfortunately the problem persists.
1-Tried two different radios, x9 with original fw and another x9 with er9x (both have and are used for over a year on a daily basis with other systems and they work great)
2-Tried two different TX modules (FRSKY) and two different RX (D8R-XP) as I did not flash them to bypass the 18ms ppm issue I always used a maximum of only 6 channels.
3. -Checked and rechecked pins soldering on port 14
4. - Tried different ppm/servo leads
5. - Used 5v output from AQ to power RX and also tried an external bec
6. -For connecting to PC I have used a 3dr 433 radio modem but also done tests with my FTDI.
With any of the previous combinations the problem always appears, and it is curious how sometimes ppm input simply does not work.
Here are two logs showing the problem, I attach both a jpg and the entire log.
Complete log 84mb
Note that after 20000 radio was actually off and rx detected it (failsafe deactivated) so no signal was sent to AQ
Here there´s the complet log 16mb
I hope that somebody could help me, and thank you all in advance.