Controlling a FC4+ with a Prop-2

[robomaster-1]

What need to do is using four digital pins to  dim up and down the four channels on the FC4+. For example when pin 2 go's HI channel one on the FC4+ will dim up when is low the channel dims down. I want to keep this very simple. Thank You for your help.

[JonnyMac]

1) What are the levels to fade to and from?
2) What is the fade up/down timing?
3) Can more than one channel fade at the same time?
4) Can a fade be interrupted (reverse direction) before it's complete?
5) If the answer to Q4 is "No," what is the minimum hold-off time before the next fade?

We have to be very careful with phrases like "keep the very simple" -- it's simple when someone else is writing code for us, but not simple for that person if we don't give them all the information and they have to go back and modify what they wrote for us.

[robomaster-1]

Here are the answers to your questions.

1) fade from 0 to 255 for up.
2) fade up/down timing is 1250 milliseconds.
3)YES.
4) No

[JackMan]

Your fade time will be easily adjustable in the coding but 1.25 seconds is barely noticeable to the human eye, it almost appears as either on or off.

[robomaster-1]

Change it fade up/down timing 4 seconds