A 5V relay module is a type of interface module that is used to control a relay using a 5V digital signal from a microcontroller such as an Arduino. Relays are electrically-operated switches that can be used to control a variety of electrical devices, such as motors, lights, and appliances. The 5V relay module typically contains a small coil that is activated by the digital signal from the microcontroller, which causes a switch to close or open, turning the electrical device on or off. The use of a relay module allows a microcontroller to control high-power devices that it would not be able to control directly.
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