Relay Module

  A relay is an electronic component used for controlling circuits. It works by sensing changes in input current to control the opening and closing of the circuit. Relays are commonly used in automation control circuits, where they play roles such as automatic adjustment, isolation, safety protection, and switching. A DC relay typically has five pins: two are coil control pins, and the other three are the normally open (NO) pin, normally closed (NC) pin, and common (COM) pin. When no power is applied, the coil is not energized, the NC pin is connected to the COM pin, and the NO pin is disconnected from the COM pin. When powered, the coil is energized, the NO pin is connected to the COM pin, and the NC pin is disconnected from the COM pin. Thus, a relay acts as a switch, enabling low voltage control of high voltage circuits.

Module Source

Purchase Link: https://item.taobao.com/item.htm?spm=a1z10.5-c-s.w4002-24706531925.33.886b4450Jc12tZ&id=546724904969
Baidu Netdisk Download Link:
http://pan.baidu.com/share/link?shareid=3950641169&uk=2302102993

Specifications

Operating Voltage: 5V

Controllable AC Voltage Range: Up to 250V, 10A

Controllable DC Voltage Range: Up to 30V, 10A

Control Method: GPIO

Number of Pins: 4 Pins (2.54mm pitch header)

Description: Uses optocoupler isolation to protect MCU pins; utilizes a transistor driver.

Hardware Connection

Relay Module         Development board
VCC                    5V
GND                   GND
IN1                    2

Usage Method

/******************************************************************************
  * Test Hardware: LCSC ColorEasyDuino Development Board
  * Version Number: V1.0
  * Modified By: www.lckfb.com
  * Modification Date: April 11, 2024
  * Function Overview:
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const int RelayPin = 2;

void setup()
{
  pinMode(RelayPin, OUTPUT);
}

void loop()
{
  // 打开继电器
  digitalWrite(RelayPin, HIGH);
  // 等待1000毫秒（1秒）
  delay(1000);
  // 关闭继电器
  digitalWrite(RelayPin, LOW);
  // 等待1000毫秒（1秒）
  delay(1000);
}

Usage Testing