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HUB PROJECTS | TUTORIALS | COURSES | KITS YOU ARE HERE:  HOME   /   ARDUINO   /  HOW TO USE 5V RELAY ON ARDUINO How to use 5V Relay on Arduino JUNE 12, 2017  BY  ANUSHA   5 COMMENTS Arduino is a microcontroller based prototyping board that runs on small DC power. A Relay is a device that helps microcontrollers (or microcontroller based boards) like Arduino to switch on or off different household appliances like motors, lights, water heaters, television and fans etc. Today, Arduino is being used for a wide range of applications like controlling LEDs, monitoring temperature, logging data and turning on motors etc. Another important task that can be accomplished by the Arduino is controlling a 5V Relay to operate high voltage AC appliances and devices. Arduino family of microcontrollers, like UNO, Nano and Mega etc. can be programmed to control a simple 5V relay i.e. switch it on or off on the event of pushing a button, reading the value of

#include <SoftwareSerial.h> #include <DHT11.h> //============================================= #include <Wire.h> #include <LiquidCrystal_I2C.h> //LiquidCrystal_I2C lcd(0x27, 16, 2); LiquidCrystal_I2C lcd(0x3F, 16, 2); SoftwareSerial ArduinoSerial(3, 2); // RX, TX //============================================= int SW_ON = 4,SW_OFF = 5,pin=6;//กำหนดขา INPUT int Sun = 9,CSun = 0,Relay1 = 12, Relay2 = 11; //กำหนดขา OUTPUT  int ATL = A0,ATH = A1;//กำหนดขา Analog int VTL1 = 0,VTH1 = 0,TL = 0,TH =0,VRHL = 50,VRHH = 80; DHT11 dht11(pin); //============================================= void setup() {   lcd.begin();   Serial.begin(115200);   ArduinoSerial.begin(4800);   while (!Serial){     ;     }   //=====================================================   lcd.setCursor(0, 0);lcd.print("Elec Pattayatech");   lcd.setCursor(0, 1);lcd.print("Smart Farm 2016 ");   delay(5000);   //===============================================

#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); int aVal=0,tempaVal=0; const int SW_ON = 2; const int led_ON =  13; int CSW_ON = 0; int C_CSW_ON =0; int Relay1=12,Relay2=11,Relay3=10,Relay4=9; int sensorPin = A0; int sensorValue = 0; void setup() {   lcd.backlight();   lcd.begin();   Serial.begin(9600);   pinMode(led_ON, OUTPUT);pinMode(SW_ON, INPUT);   pinMode(Relay1,OUTPUT);pinMode(Relay2,OUTPUT);   pinMode(Relay3,OUTPUT);pinMode(Relay4,OUTPUT); //   digitalWrite(Relay1,HIGH);digitalWrite(Relay2,HIGH);   digitalWrite(Relay3,HIGH);digitalWrite(Relay4,HIGH);   lcd.setCursor(0,0);   lcd.print("Project2017");   lcd.setCursor(0,1);   lcd.print("standby"); } //END Setup void loop() {   CSW_ON = digitalRead(SW_ON);   sensorValue = analogRead(sensorPin);//Serial.println(sensorValue);   //=======================================================================   int c_sensorValue1 = map(sensorValue,0,1023,0,255);   //Seria

#include <Stepper.h> #include "Keypad.h" #define STEP_ANGLE_4STEP 32 //360/11.25 degree #define STEP_OUT_WITH_GEAR 2048 //32*64 Stepper stepper(STEP_ANGLE_4STEP,8,10,9,11); char keys[4][4]={   {'7','8','9','A'},   {'4','5','6','B'},   {'1','2','3','C'},   {'*','0','#','D'}}; byte rowPins[] = {7,6,5,4}; byte colPins[] = {3,2,1,0}; int speedmotor = 400; int dirmotor = 1; Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,4,4); void setup() { } void loop() {   char key = keypad.getKey();   if (key != NO_KEY)   {         if (key == '1')             speedmotor = 400;         if (key == '2')             speedmotor = 700;         if (key == '3')             speedmotor = 1000;          if (key == 'A')             dirmotor = 1;         if (key == 'B')             dirmotor = -1;

#include <LedControl.h> #include <DHT11.h> int pin=4; DHT11 dht11(pin); LedControl lc=LedControl(8,10,9,1); // Pin 8->DIN, 10->CLK, 9->CS(LOAD), 1 = No.of devices void show2digit(int h,int t) {   int seg1,seg2,seg3,seg4;   seg1 = h%10;   seg2 = h/10;   lc.setDigit(0,4,seg1,false);   lc.setDigit(0,5,seg2,false);   seg3 = t%10;   seg4 = t/10;   lc.setDigit(0,0,seg3,false);   lc.setDigit(0,1,seg4,false);   delay(300); } void setup() {   Serial.begin(9600);   while (!Serial) {       ; // wait for serial port to connect. Needed for Leonardo only     }   lc.shutdown(0,false);    lc.setIntensity(0,5);   lc.clearDisplay(0); } void loop() {   int err;   float temp, humi;   if((err=dht11.read(humi, temp))==0)   {     Serial.print("temperature:");     Serial.print(temp);     Serial.print(" humidity:");     Serial.print(humi);     Serial.println();       }   else   {     Serial.println();     Serial.print("E

#include <LedControl.h> #include <OneWire.h> #include <DallasTemperature.h> #define ONE_WIRE_BUS 11 OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); float Tfloat; long Tint; LedControl lc=LedControl(8,10,9,1); // Pin 8->DIN, 10->CLK, 9->CS(LOAD), 1 = No.of devices void show6digit(int num) {   int seg1,seg2;   seg2 = (((((num%100000)%10000)%1000)%100)/10);   seg1 = (((((num%100000)%10000)%1000)%100)%10);   lc.setDigit(0,0,seg1,false);   if (num>=10)       lc.setDigit(0,1,seg2,false);   delay(300); } void setup(void) {   sensors.begin();   lc.shutdown(0,false);    lc.setIntensity(0,5);   lc.clearDisplay(0); } void loop(void) {   sensors.requestTemperatures();   Tfloat = sensors.getTempCByIndex(0);   Tint = int(Tfloat);   lc.clearDisplay(0);   show6digit(Tint); }

include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); int PIRpin = 8; void setup() {   lcd.begin();   pinMode(PIRpin,INPUT);   lcd.home();   lcd.print("Waiting for PIR");   delay(10000);        lcd.clear(); } void loop() {   int x = digitalRead(PIRpin);   lcd.home();   lcd.print("PIR = ");   lcd.print(x);   delay(100); }

#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); int triggerPin = 13; int echoPin = 12; long duration,distCM,temp_distCM=0; void setup() {   lcd.begin();   lcd.setCursor(0,0);   lcd.print("Dist =      cm");   pinMode(triggerPin,OUTPUT);   pinMode(echoPin,INPUT); } void loop() {   digitalWrite(triggerPin,LOW);   delayMicroseconds(2);   digitalWrite(triggerPin,HIGH);   delayMicroseconds(10);   digitalWrite(triggerPin,LOW);   duration = pulseIn(echoPin,HIGH);   distCM = duration/58;   if (temp_distCM != distCM)   {     lcd.setCursor(7,0);     lcd.print("    ");   }   lcd.setCursor(7,0);   lcd.print(distCM);   temp_distCM = distCM;   delay(300); }

#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); int aval,temp_aval=0; void setup() {   lcd.begin();   lcd.setCursor(0,0);   lcd.print("aval = "); } void loop() {    aval = analogRead(A0);    if (temp_aval != aval)    {       lcd.setCursor(7,0);       lcd.print("    ");    }    lcd.setCursor(7,0);    lcd.print(aval);    temp_aval = aval;    delay(300); }

#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); int aVal=0,tempaVal=0; void setup() {   lcd.begin(); } void loop() {   aVal = analogRead(A0);   if (tempaVal != aVal)   {     lcd.clear();     lcd.setCursor(0,0);     lcd.print("LDR");     lcd.setCursor(0,1);     lcd.print(aVal);     delay(300);   }   tempaVal = aVal; }

#include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); void setup() {   lcd.backlight();   lcd.begin();//LiquidCrystal_I2C } void loop() {   lcd.setCursor(0,0);   lcd.print("Hello LCD I2C");   lcd.setCursor(0,1);   lcd.print("Pattayatech"); }

#include "LedControl.h" #include "Keypad.h" #define C4  262 #define D4  294 #define E4  330 #define F4  349 #define G4  392 #define A4  440 #define B4  494 #define C5  523 char keys[4][4]={   {7,8,9,0},   {4,5,6,0},   {1,2,3,0},   {0,0,0,0}}; byte rowPins[] = {7,6,5,4}; byte colPins[] = {3,2,1,0}; Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,4,4); int melody[] = {C4,D4,E4,F4,G4,A4,B4,C5}; int dl = 300; int buzzerpin = 11; LedControl lc=LedControl(8,10,9,1); // Pin 8->DIN, 10->CLK, 9->CS(LOAD), 1 = No.of devices void setup() {   lc.shutdown(0,false);    lc.setIntensity(0,5);   lc.clearDisplay(0);   pinMode(buzzerpin,OUTPUT);   digitalWrite(buzzerpin,HIGH); } void loop() {   char key = keypad.getKey();   if ((key != NO_KEY) && (key < 9))   {     lc.setDigit(0,0,key,false);     tone(buzzerpin, melody[key-1],dl);     delay(dl);     digitalWrite(buzzerpin,HIGH);   } }

#include "LedControl.h" #define C4  262 #define D4  294 #define E4  330 #define F4  349 #define G4  392 #define A4  440 #define B4  494 #define C5  523 int melody[] = {C4,D4,E4,F4,G4,A4,B4,C5}; float beats[] ={1,1,1,1,1,1,1,1}; int buzzerpin = 11; int timestop = 70; LedControl lc=LedControl(8,10,9,1); // Pin 8->DIN, 10->CLK, 9->CS(LOAD), 1 = No.of devices void setup() {   lc.shutdown(0,false);    lc.setIntensity(0,5);   lc.clearDisplay(0);   int dl = 500;   pinMode(buzzerpin,OUTPUT);   int numnote;   numnote = sizeof(melody)/2;    for (int i=0;i<numnote;i++)   {     lc.setChar(0,7-i,'-',false);     tone(buzzerpin, melody[i],dl*beats[i]);     delay(dl*beats[i]);     digitalWrite(buzzerpin,HIGH);     delay(timestop);   } } void loop() { }

#include "LedControl.h" #include "Keypad.h" char keys[4][4]={   {'7','8','9','A'},   {'4','5','6','B'},   {'1','2','3','C'},   {'E','0','F','D'}}; byte rowPins[] = {7,6,5,4}; byte colPins[] = {3,2,1,0}; Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,4,4); LedControl lc=LedControl(8,10,9,1); // Pin 8->DIN, 10->CLK, 9->CS(LOAD), 1 = No.of devices void setup() {   lc.shutdown(0,false);    lc.setIntensity(0,5);   lc.clearDisplay(0);      } void loop() {   char key = keypad.getKey();   if (key != NO_KEY)   {     lc.setChar(0,0,key,false);   } }

int led = 13; int sw = 2; void setup() {   Serial.begin(9600);   pinMode(led,OUTPUT);   pinMode(sw,INPUT);      } void loop() {   int x;   x = digitalRead(sw);   Serial.print("x = ");Serial.println(x);   digitalWrite(led,!x);  }

int led = 10; void setup() {   Serial.begin(9600);   pinMode(led,OUTPUT);    } void loop() {   int x,y;   x = analogRead(A0);   y = map(x,0,1023,0,255);   Serial.print("x = ");Serial.println(x);   Serial.print("y = ");Serial.println(y);    analogWrite(led,y); }

#include "LedControl.h" LedControl lc=LedControl(5,7,6,1); // Pin 5->DIN, 7->CLK, 6->CS(LOAD), 1 = No.of devices void show4digit(int num) {    int seg1,seg2,seg3,seg4;   seg1 = ((num%1000)%100)%10;   seg2 = ((num%1000)%100)/10;   seg3 = (num%1000)/100;   seg4 = num/1000;    lc.setDigit(0,0,seg1,false);   if (num>=10)     lc.setDigit(0,1,seg2,false);     if (num>=100)         lc.setDigit(0,2,seg3,false);     if (num>=1000)         lc.setDigit(0,3,seg4,false);      delay(300); } void setup() {     Serial.begin(9600);     lc.shutdown(0,false);      lc.setIntensity(0,5);     lc.clearDisplay(0);      } void loop() {     int num;     num = analogRead(A0);     Serial.print("analogRead=");Serial.println(num);     lc.clearDisplay(0);     show4digit(num); }