An IoT Relay Module is an electronic component that enables the remote control of electrical devices through a relay switch. Typically used with microcontrollers such as Arduino, ESP8266, or ESP32, these modules allow the activation or deactivation of high-voltage electrical circuits using low-voltage signals from a controlling device. This makes them ideal for applications where direct human interaction with electrical appliances or machines is not possible or desired.

    At its core, the IoT Relay Module consists of a relay, which is an electrically operated switch. The relay has an input that triggers its operation, usually a signal from a microcontroller or a smartphone. When activated, the relay closes or opens its contacts, allowing or interrupting the flow of current to the connected device.