I'm trying to build for myself a smartphone camera wired trigger over audio input/output port (a.k.a. 3.5 mm jack used for heaphones/headsets). I'm completely lacking electronic engineering skills (only what learned back in school). So here it goes..
There is such 3.5 mm Headset: Accessory Specification, which I think is the go to for what I'm trying to do..
After trying the headset that I have both Volume - and Volume + perform the same task - take a photo, no matter which button you press. Thus from specification it would be either Function B or Function C - doesn't matter much which.
So the questions that I have are:
- Can I safely remove buttons (and resistors associated with them) that I don't need in this case from the schematics safely (in this case Function A and Function D buttons, and optionally one of Function B or Function C), leaving with just one button - either Function B or Function C in the schematics?
- Can I safely not include both speakers in the schematics?
- Can I safely remove the microphone from the schematics or do I have to replace it with a resistor?