I have a mirror where i have replaced the internal fluorescent lights with led strips. I would now like to make a dimmer for this, but have no place where i can place physical controls like buttons or a dimmer switch since the mirror is mounted flush with the tiled wall.
Does anyone have any ideas for a sensor that i can use to sense a hand in front of the mirror from behind the mirror? I only need to sense the presence of the hand in a zone, having one zone for dimming up and one for dimming down.
The sensor should preferably not require the user to touch the mirror, but any ideas are greatly welcomed.