You will find thousand of different types of switches are needed to interface the outside world to a project. I could name 100 without stopping: leaf, micro, pressure, temperature, altitude, inductive, metal detection, capacitive, friction, inertia, impact, illumination, pressure mat, glass beak, sound, frequency and the list goes on with long-reach, micro-touch, 90° and more.
Most of them are well-known but here are a few new ideas found on toys.
The following photo is a spinning top. On the other side of the PC board are 3 LEDs and a COB (Chip On Board). The circuit is turned on when the two inertia switches make contact. Note: The two switches are on either side of the centre shaft and both have to receive centrifugal force to throw the ball in each switch towards the periphery of the board.
The cover has been taken
off the right-side inertia switch to show the design of the switch.