A relay is an electrically operated switch. It is used to control a circuit by a separate low-power signal, orswitch a circuit on or off. A relay module is a device that houses one or more relays. It is typically used to control higher voltage or current circuits with a lower voltage control signal.
A 2-channel relay module is a type of relay module that has two independently controllable relays. Each relay has a set of normally open (NO) and normally closed (NC) contacts that can be controlled by the module.
The 2-channel relay module can be controlled by a microcontroller or other control device, such as a computer or smartphone, through a control signal. The control signal is usually a digital signal, such as a voltage level, that can be easily understood by the microcontroller or control device.
The 2-channel relay module is widely used in various applications, such as controlling lights, motors, and other electrical devices. It is a convenient and cost-