It would be really interesting if somebody was able to test the arduino case on a drone for which values have been published, as it was significantly easier to setup than the rotating wheel method.
DJI Phantom 2 74
DJI Phantom 3 33
DJI Phantom 4 33
DJI Inspire 1 – FC330 30 30
DJI Inspire 1 – FC350 33 33
DJI Inspire 1 – X5 47
3DR Solo 30
GoPro Hero 4 Black 30
I’ve got a P4 and an arduino on the way. Not sure where my existing one went. I can run the P4 over the weekend.
It’ll take me a bit, but I’ll try to source an arduino. I’ve had no luck with any of my screens here.
I counted 53 lines on your image, adjusting the image makes them easier to see.
Quite a bit of pincushion distortion with the M2P camera, I included the partial lines at top and bottom edges.
Just bought this:
Apparently Arduino IDE compatible and has an in-built LED. Hopefully this is sufficient for testing haha.
That poses an interesting question… When do we count a line? 50% of the width of the screen or more? Being present/visible at all?
I can offer pictures with this drones with the arduino thingy (tried with the monitor, no avail):
DJI Air2s
DJI Mini 2
DJI Phantom 4 Pro
Autel Evo II Pro RTK
Interested?
Yes please!
I’m getting 32ms for P4:
I confirmed the same numbers running at 250 and 500ms just to make sure I wasn’t off on line count.
I’m guessing 32ms is within spec of the published 33ms and probably not a measurement error, especially as arduinos run a real-time OS, but it certainly validates the method either way.
Edit: it could also be a sensor crop issue. This seems most likely.
Well, this is really good news! Thanks for testing this out.
Now there’s two more things to do to make this perfect for crowdfunding:
Maybe relevant if there isn’t something already out there:
Also this: https://upverter.seeedstudio.com/
Designing a custom PCB might be a cool project; at that point you wouldn’t even need an arduino, just a 555 timer, USB type-A connector, an LED, some resistors and a capacitor. https://www.kicad.org/
Yeah, built those before. 555 is pretty temperature sensitive (or was for my application which was flying on a balloon, triggering a camera). Would we have to worry about timing differences with it?
Maybe if you’re Adam Steer this could be a concern 
I would expect most folks could use this within normal temperature ranges.
This would make an excellent nerdy fundraiser for ODM. Figuring out a decent kit price and assembled price, then putting a small markup to contribute to the project, would be a clever way for folks to help out and at least try to calibrate their cameras. 
If my Raspberry Pi Pico works out, then that’s about $7 ($11 in the cool case I got) and Arduino IDE-compatible… Or maybe I can just pre-flash a ton of these so they are ready to run for folks that want/need them from us?
Thanks Steven. Is this P4 or P4P ?
