Arduino + Sony A7 rec control


I've done my synchronised follow focus project for a taken lens and anamorphic adaptor, but now I miss a button that can start a video recording. I assume it can be done via Sony's cable. I found this connector online here

Also I found this small analysis. done by Sebastian

I have a Zhiyun gimbal which already has this function. But it is quite an expensive thing and I don't want to disassemble it. I'm sure it has to be a simple solution. Do you have any ideas how to start?

Did you try shorting M01 to M02 (GND)? That is what the table of pin usage would imply is the ON/OFF switch.