Introducing the Relay Module

A relay is an electrically operated switch. This mainly contains a set of several input stations for a single or many control signs, and a set of working contact terminals. The switch may have any amount of associates in several contact forms, such as make contacts, break contacts, or combinations thereof. Relays are used where it is essential to regulate a circuit by self-governing low-power signal, or where numerous circuits. This relay module has two stations. There are other models with 1, 4 and 8 channels. This unit should be motorized with 5V, which is suitable to use. There are other relay modules that are motorized using 3.3V, which is perfect for ESP32, ESP8266, and other microcontrollers.

Main Component of Relay Module

Relay Pin out: The six pins on the left side of the relay module connect high voltage, and the pins on the right side connect the component that requires low voltage.

Mains voltage connections

The high-voltage side has two connectors, each with three sockets: common (COM), normally closed (NC), and normally open (NO).

COM: common pin

NC (Normally Closed): the normally closed configuration is used when you want the relay to be closed by default, meaning the current is flowing unless you send a signal from to the relay module to open the circuit and stop the current.

NO (Normally Open): It usually open shape works the other method around the relay is always exposed, so the circuit is broken unless you send a sign from to close the circuit.

Pin Wiring

The low-voltage unit has a set of four main pins and another set of three pins. The set at the right consists of VCC and GND to power up the module, and input 1 (IN1) and input 2 (IN2) to control the bottom and top relays, respectively. The second set of these connected pins involves of GND, VCC, and JD-VCC pins. The best part is JD-VCC pin powers the electromagnet of the relay that works perfectly.

The connections between the relay modules are:

GND: goes to ground

IN1: controls the first relay (it will be connected to an Arduino digital pin)

IN2: controls the second relay (it should be connected to an Arduino digital pin if you are using this second relay. Otherwise, you don’t need to connect it).

VCC: goes to 5V

Benefits of Using Relay Module

Relays can work with AC and DC and Relays have zero closed resistance. Apart from that Relays have infinite open resistance and it can easily works Relays can operate at temperature extremes. The main factor is that Relays modules have an extreme isolation from the switch coil.

Controlling a relay module is as simple as controlling an output – you just need to send HIGH or LOW signals using an Arduino digital pin. With the support of relay module you can easily regulate almost any AC electronics appliances.