Joystick module looks same as the analog joysticks found in gamepads. Module is mounted with two potentiometers at a 90 degree angle. These potentiometers are connected to a short stick centered by springs. The output voltage varies from 0V to 5V as the joystick moves depending upon its direction as well.
Microphone module is mainly used for sound detection. On board microphone is used is highly sensitive due to which it can efficiently detect any sound. It comes with a power LED and status LED as indicator.
A distribution board is an electricity supply system which is used to divide electrical power feed into subsidiary circuit while providing complete protection to circuits with fuses and circuit breakers.