PPM via arduino from Keyes_SJoys

I want to send a signal to my DJI Ronin, to make a joystick.
I have the Keyes_SJoys thumb stick, and have several arduino controllers even UNO.

The thumbstick/joystick have GND, 5+, VRx, VRy and SW (5 pins)
but the Ronin only have 3pins..

How can I do this??

Hope I´m making sense, feel like a total n00b here.. so sorry if this was bad/to little info

I hope that someone can help me

Dji RONIN has this input named PPM/DBUS

That port requires the data in PPM format, not analog. You'll need to figure out how that format works, and write the arduino code to output it.

A google for 'arduino ppm encoder' will give you some information - other people have done this, and they've posted bits and pieces of code.