understanding the dual relay module： a versatile tool for electrical control

The Dual Relay Module is a versatile and essential component in modern electronic projects, providing a simple and effective solution for controlling high-voltage electrical devices with low-voltage microcontrollers such as Arduino, Raspberry Pi, or ESP8266. This module plays a crucial role in various applications, from home automation to industrial control, by allowing users to manage the switching of devices like lamps, motors, and fans. In this article, we will explore the structure, functionality, and applications of the Dual Relay Module, as well as its key features and benefits.

What is a Dual Relay Module? A Dual Relay Module is an electronic module that integrates two relay switches, allowing you to control two independent devices simultaneously. The module operates at low voltages (typically 5V or 12V), but it can switch high-voltage devices, usually up to 250V AC or 30V DC, with the help of electromagnetic relays. The relays are typically controlled by microcontrollers using digital output pins, which can turn the relays on or off. Each relay is equipped with two key terminals： a Common (COM), Normally Open (NO), and Normally Closed (NC). When the relay is activated, it connects the Common terminal to the Normally Open terminal, allowing current to flow to the connected load. When deactivated, the connection is made between the Common terminal and the Normally Closed terminal, cutting off the power to the load.