OSD RSSI for FrSky receivers using V2.1 sheild

This thread on AeroQuad.com discuss’s converting the RSSI output from FrSky receivers (6XR, 8XR, and D8RII-Plus)  to be able to use it with an OSD. To be usable for most OSD’s the output must be converted from PWM to an analog voltage which is accomplished by running the signal through an RC Filter. You will need to verify the requirements for the peculiar OSD you are using.

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