Together with OcuSync Air System, Goggles RE can be used to transmit third-party radio control system stick signals from Goggles to S.BUS output of OcySync Air System. For this, a trainer port signal of a third-party remote controller is connected to the Goggles RE audio port that samples the pulse-width modulated signal chain. For debugging purposes, a visual display of the live state of 8 servo channels can be activated in Goggles RE.

The Goggles RE + OcuSync Air System user manual lists some supported third-party radio control system transmitters, such as models from Futaba, Frsky, Walkera, WFLY and RadioLink. Fine. For the purpose of wanting to use own (microcontroller based) trainer port signal generator, I am interested to know the maximum voltage level of the signal that can be injected into the audio port of Goggles RE (via mono 3.5mm plug)?

I assume, a 3.3V signal level is fine, but would like to know if 5V, or possibly even a higher signal level would also be OK.

Thank you!

P.S. The goal is to remote control a robot from far away by code running on a PC at base, where the control signal (e.g. servo positions) will be transmitted via the OcuSync link. The signal path would be PC -> custom signal converter -> Goggles RE -> OcuSync Air System -> S.Bus -> custom robot controller.

Statusupdate - I created a Microchip PIC32 based USB CDC to PPM converter, and if I output the 3,3V logic level PPM signal directly from microcontroller digital output pin to the Goggles RE audio port with mono 3.5mm jack, all works as expected - I see the channels changing in Goggles RE debug display according to the Visual Studio C# code I created for the PC.

Nevertheless it would be nice to know what the electrical specifications for the Goggles RE audio port input are?

Further details about the PC control circuit and a demo application are posted at the following RCgroups thread:
https://www.rcgroups.com/forums/ ... -for-DJI-Goggles-RE