Can a transistor replace a switch that closes ground to an input?

Question

I've been browsing on Google for quite a bit now but couldn't find an answer.

I have a remote that triggers the shutter of a digital camera.

According to the schematics that I've found, the microswitch simply closes ground to the input of the camera's processor. Did I get this right?

Is there a way to replace SW1 and SW2 with a couple of transistors and control them with an Arduino or similar?

Answer 1

Yes, you could use a transistor. But it is safer to use an optocoupler. Less risk of something going wrong and damaging your camera.

The optocoupler part number is not critical, something like a 4N35.

^{simulate this circuit – Schematic created using CircuitLab}