I am trying to use an ESP32 to remotely trigger my camera via WiFi, via the remote trigger outlet on the camera (which uses a 2.5mm audio jack.)
To trigger the focus, I need to connect the tip (3.3V) to the sleeve. To ground the tip, and to trigger the shutter, I need to connect the first ring (also 3.3V) to the sleeve to ground the ring.
So far I have this:
I would push the ESP pins high to send each of the tip or the sleeve to ground.
Will the transistor work in this way where the ESP is driving a completely different circuit, or will I need to link the ground of the ESP32 to the camera ground? Am I missing something all together here?