I was curious about the camera output on the SYMA X8 and how the controller causes the camera to activate.
Putting a 3.5 mm jack into the 3.5mm socket we find the following signals on the pins
|GND - 0V
|Control - nominally: 3.3V
Start/Stop video: 0V for 1 second
Take picture: 0V for 250 milliseconds
This is the scope showing the video signal (1s) and then the photo shot signal (250ms).
I use a Runcam 2 for photography but wonder if this signal could be harnessed to trigger the RunCam and/or drone recovery buzzer for when it lands in the corn field!
I’ll expand on this post if I get anywhere with that idea.