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the only radio transmitters, also called remote controllers, that embed a fpv screen, for seeing what the drone sees, near the joysticks, instead of having to get obstructed vision by goggles,

that I found, are :

  1. https://www.youtube.com/watch?v=df0Cvv3T69Y called fpv1 (i'm not interested into h7000 as it runs android and requires wifi rather than RC) enter image description here
  2. https://www.youtube.com/watch?v=XBbptOuXXdA called fpv2 enter image description here

However they only seem to be able to bind Hubsan drones...

  1. Would it exist a way to flash them in order to make them run openTX firmware, or anything that could make them become universal controllers?

  2. Alternatively, what parts from Hubsan should I buy if I want to put in my own custom drone build and be compatible with the DIY ecosystem ?

  3. Can I build from scratch a controller with arduinos so that I could use openTX, embed an fpv screen, while still getting decent range (>5km) ?

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I'll start by warning that you may have misconceptions that are leading you in the wrong direction. The reason that FPV screens built into transmitters are not more popular is that screens aren't bright enough to compete with sunlight. The primary function of goggles is to cut out bright reflections, so you can see the picture.

Also, transmitters are comfortable when held down at your waist, which would make the picture on these transmitters too small. You'd need something the size of a laptop or tablet computer screen to work well at arms length. The picture from an FPV camera is pretty low quality by modern TV standards, and needs all the help it can get.

The transmitters you link can't be flashed to run OpenTx. They just weren't designed to be modified like that. They may not even have enough flash memory or processing power, as OpenTx has vastly more features. Similarly Hubsan doesn't sell a stand-alone receiver for their transmitters.

You probably could buy an OpenTx radio and transplant the electronics into one of these cases, but I think you'd have to find something clever to make their TV format screens display information that was designed for a dot-matrix screen. You could look at the boards used for OSD (On Screen Display) but I imagine it would get very technical.

I think your best bet would be one of the many FPV monitors, mounted to the top of a normal transmitter - just be sure to stand in a shady spot.

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  • $\begingroup$ You are right, I guess I thought about free vision because of hostile societies in some places. About tablets, I did found some Eachine ROTG01-like devices but can I get all joysticks on the screen (tablet standalone) ? I'll create a thread on this anyway ; also is the latest crossfire-shot no-delay-protocol more "HD" ?; and is there a way to get a cheap kit (cheaper than the teamblacksheep ones)?. If I retrieve the receiver from a hubsan drone, can I wire it to my flight controller of choice with betaflight/inav/ardupilot? $\endgroup$
    – user1598
    Commented Feb 22, 2021 at 15:17
  • $\begingroup$ Is the binding of receivers from one brand and transmitter from another just an affair of handshake ID or also the whole protocol? Are receivers re-flashable?. So I can't replace Tx16s' screen by a multisource one? Do you know builds portabilizing common controllers (goal is a thin DJI smart form-factor, too poor atm tho + it needs goggles anyway) ? Are the gamestation controllers not powerful enough for RC (openTX or other), provided that we embed antennas on it? $\endgroup$
    – user1598
    Commented Feb 22, 2021 at 15:18
  • $\begingroup$ Also I read here aliexpress.com/item/… "Amiccom A7105: FlySky, FlySky AFHDS2A, Hubsan", does it mean hubsan controllers could bind a generic receiver from the brand flysky and therefore control any DIY custom drone?? $\endgroup$
    – user1598
    Commented Feb 22, 2021 at 18:14
  • $\begingroup$ I wasn't recommending using a tablet - just describing the size of screen you'd need to hold the transmitter at a comfortable position to point out how impractical an all-in-one device would be. $\endgroup$
    – Robin Bennett
    Commented Feb 23, 2021 at 8:49
  • $\begingroup$ I don't think you'll be able to separate the receiver from the rest of the electronics in a hubsan drone - everything will be on one board, possibly even in one chip. $\endgroup$
    – Robin Bennett
    Commented Feb 23, 2021 at 8:50

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