Learn what a relay module is, how it works, and what types and applications it has in electronics, automation, and medical fields. A relay module is an electrical switch that uses a low-power signal to control a high-power circuit with an electromagnet and a transistor. What is a Relay Module? A relay module is an electrical component that functions as a switch, allowing low-power signals (such as those from a microcontroller) to control high-voltage or high-current devices such as lights, motors, or household appliances. Learn how to use a 5V single-channel relay module to switch mains current from a microcontroller or sensor. The module has a relay, a transistor, a diode, LEDs, and a screw terminal block. What is a Relay Module? A relay module is a device that allows a low-power signal to control a high-power circuit. Essentially, it acts as an intermediary, using a small electrical signal to switch on or off a much larger electrical load. Relay modules are widely used in automation systems, industrial machinery, automotive electronics, and home automation. They provide a convenient and ...
