Help Implementing AUX2 & AUX3

[Nicksdesign]

I would like to use AUX2 and AUX3 on my Crius SE typ FC board. I have been unable to figure this out on my own and am requesting help. Please?

[QuadBow]

Are we talking about a promini (328p) based board?
This provides only 5 or 6 input channels.
The first 4 channels are required for pitch, roll, throttle and yaw. So, there are 2 channels left (Aux1 and Aux2)

To your question:
You can only enable Aux2 by defining RCAUXPIN8. In this case the buzzer is disabled.
Or you can enable Aux2 by defining RCAUXPIN12. In this case the powerpin is disabled.
Enabling Aux3 on a promini requires major code changes.

But, it is simpler to send the pulses of all 8 channel over one channel in ppm sum mode.
Then one single pin is enough at the promini to detect all 8 channels.
If your receiver doesn't support ppm sum mode, you have to add a sum signal converter, which joints the 8 channels into that single one.

[Nicksdesign]

Thanks for the help. The Crius SE is a 328p based board. AUX2 & AUX1 are enough for now.