Here is what I have found for ADC port to ArduPilot pin mappings. 5v and GND are left out. Please correct if wrong.
Navio2->ArduPilot
Power Port
ADC0->2 (Voltage)
ADC1->3 (Current)
ADC Port
ADC2->4
ADC3->5
It seems about right. We’ll update the docs, accordingly. Thanks!
thnx a lot, ill add that to my docs 
they only work as inputs, arent they ?!
Are there also digital outputs available at the Navio2 ?
like i have on my apm2.6 e.g. to switch a FET or trigger a camera ?
thnx
Helmar
btw, your docs read differently: (ADC3 and ADC3 inverted) which one is right?
A0 - board voltage(shows 5V),
A1 - servo rail voltage,
A2 - power module voltage,
A3 - power module current,
A4 - ADC3
A5 - ADC2
(from https://docs.emlid.com/navio2/Navio-dev/adc/)
i think there are a couple DIO on the UART port.
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thnx, but thats not what i meant, those are the GPIO17 and 18 of the rpi
i dont think i can manipulate them using my remote, at least not form the arducopter fimware
im looking for DIOs (as used e.g. in apm.2 Archived:APM 2.5 and 2.6 Overview — Copter documentation)
can the ADCs of Navio2 also used as DIOs as in the old apm hardware ?
thnx
Helmar
Sure, you can. Is there anything I’m missing out?
No. But you can use GPIO17/18 instead.
how? can you be a little bit more spezific
thnx
Helmar
You can use USERHOOKS feature and GPIOs.
It’d be easier if you could say what is that you’re trying to achieve?
ive this board: ExtensionPCB - MikrokopterWiki
basically two fets and an optocoppler to trigger camera and switch something else (e.g. high power LED)
basically i wanted to use this board at the navio2 for triggering my camera. usually switched via NPN open
collector (at MK-FlightCtrl). Maybe i can use it also with the rpi or Navio2 ?!
any suggestions appreciated
thnx
Helmar