Yes, I have written about capacitive side on mobile phone to enable more trigger buttons in playing games on smartphone. I came up with new idea, although the feasibility here is less.
Camera can be used as a trigger button. That is, when the user cover the camera with a finger such that the sensor only reads black screen, that means the button is pressed. Indeed, this does not add any more requirement to current phone. However, there are 2 possible damages here.
One is obviously the battery will drain faster as the camera sensor needs to be active at all time during the game. Another is that since the camera sensor needs to be active at all time during the game, it will heat up and the sensor might be damaged.
Well, it is an idea, so I just share it. Maybe it could be made feasible by activating the camera sensor only when the trigger button is needed (for example, when the action gauge is full).
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