I'm helping my daughter build an escape room for fun, and we wanted to open a box automatically when the participants solved another riddle, placing runestones in a correct orientation (I'm using 3 of these Sonoff Door/Window sensors to detect the position of 4 hexagonal-shaped runestones that we 3d printed). When all three sensors are triggered (meaning the runestones are in the correct order and orientation) this triggers a Shelly Manipulator controlled by a Shelly 1 UL which are both also available at ameridroid, and those are both run by a 12V battery that came out of a faulty UPS (battery backup). It's a lot of fun.
