So now we have developed our mood lamp, but it will turn on only when we connect a power supply to Arduino. It won't turn on or off depending on the darkness of the environment. Also, to turn it off, we have to disconnect our power supply from Arduino. In this section, we will learn how to use switches with Arduino.
Switches are one of the most elementary and easy-to-overlook components. Switches do only one thing: either they open a circuit or short circuit. Mainly, there are two types of switches: