Making Fat Shark FPV goggles work with OPENROV ($7 solution ?)

March 7, 2014

Robodox ROV team is building an OPENROV 2.5 kit for Algalita Research Foundation to take on their July 2014 Pacific Gyre expedition.    The ORV catamaran , named Alguita, will take a team of scientist to sample and analyze the effects of plastic in the ocean on marine species.    To help extend their capability to locate plastic concentrations they are utilizing a variety of sensors.   One is a Phantom quadcopter drone equipped with a Fat Shark Predator V2 FPV system.

IMG_7776The Predator V2 uses two LCD screens to display video in goggles show below.

IMG_7783

The Predator specifications are shown here.   Pictures are sent from an aerial camera platform to the goggles in real time over a 5GHz wireless link.

openrov 2.4The underwater ROV that Robodox is building will do a similar function by transmitting HD camera video to a topside Laptop computer over a two wire tether.    It would be desirable if the Fat Shark video goggles could also display the Laptop video sent by the ROV.    Unfortunately the video formats are not compatible without a VGA to composite video converter.   I did a little research into how this could be accomplished.

Here is the plan:

1) purchase a Tmart $3  VGA to A/V RCA converter.  03m-VGA-to-SVIDEO-and-RCA-Female-Cable_320x320

2) Purchase an $3.50 Allelectronics 3.5mm  A/V  to RCA cable with 6 ft  extension to allow freedom of movement between the laptop and the goggles.

3) Plug the VGA converter into the laptop VGA output port and then plug the 3.5mm A/V cable into the Fat Shark video input port via the extension.   Turn off the Fat Shark wireless receiver.

Seems like this would work…yet to be tested.

Wireless Connection to the Fat Shark

The transmitter side of the Fat Shark FPV system involves a small 600 TVL camera that plugs into a transmitter compatible with the receiver in the goggles.

Fat Shark tranmitter

If the transmitter is available on the boat (ie a spare that is used for the Phantom drone) then the output of the converter could be used in place of the camera output that plugs into the transmitter.   This way the goggles could be free from any wires. There would be another plug adapter to mate the composite video RCA plug to the plug on the xmitter.

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