In a smart system, sensors act like the nerves—they detect changes in the environment. But what happens after sensing? That’s where actuators come in.
Actuators are like the muscles of a machine. They take instructions from a controller (like Arduino or Raspberry Pi Pico) and turn them into movement, sound, or other actions.
Without actuators, a machine could detect things but never actually respond. From spinning the drum of a washing machine to opening an automatic door, actuators make things happen in the real world.