Hi pmshop, as you were of great help on this topic, i want to ask you if you know anything about the topic of my latest struggle 
You can find it here: PX4FLOW Smart Camera APM2.8
thanks in advance!!
You are quite welcome.
However, I never used a flow sensor so I cannot advise.
Hope you find the answer soon!
Thnx!! I found it cheap so thought, Lets try it. I think the one they sent me is for a pixhawk (i am thinking of buying one, just to see the difference) so i am now emailing with the supplierā¦
If it is what I think it is, I got one too - cheap. So cheap it was incomplete and useless by itself.
Look at Banggood for the PixHawk - $60 USD
Haha thats what i thought, but it does work when i connect it to mission planner directly with USB. I just think that the APM does not support it on the I2C port. Because all the wiring diagrams use the pins next to the gimball connectionā¦
Do you now what is better on the pixhawk in comparison to the APM?
I know it has got a 32bit CPU and all, but how would I experience the differences?
everything - I went Pix after APM for 6 months.
It is awesome!
Haha thans clear than 
I will start shopping this weekend 
, along with the parts for the 250 quad i want to build with a naze32 full
Thanks for the quick response! But i think you are mixing up FCās. I have
an apm 2.8, there is a blue led for GPS and a red one for arm state. The
beeps can only be one pitch on this board. There are 3 short ones and 1
long oneā¦i am suspecting something with the GPS, beacause when i engage
the loiter flightmode it starts to drift away, and the althold mode works
fine. So now I programmed positionhold on one switch and will try that
later this week.