Arduino Timer Control Relay Devices

Arduino Timer Control Relay Devices

CIRCUIT DIAGRAM : 

MATERIALS :

Arduino Nano/UNO

LiquidCrystal I2c Display

Relay Module

Buzzer

Push Buttons

BreadBoard

Bulb Holder Socket

Wires

CODE :

//Eliyas Science Info

//Arduino Timer Relay - Triger relay for specific time

#include <LiquidCrystal_I2C.h> //https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library

LiquidCrystal_I2C lcd(0x3F, 16, 2); // LCD HEX address 0x3F -- change according to yours

#include "Countimer.h" //https://github.com/inflop/Countimer

Countimer tdown;

#include <EEPROM.h>

#define bt_set A3

#define bt_up A2

#define bt_down A1

#define bt_start A0

int time_s = 0;

int time_m = 0;

int time_h = 0;

int set = 0;

int flag1=0, flag2=0;

int relay = 5;

int buzzer = 6;

void setup() {

Serial.begin (9600);

pinMode(bt_set, INPUT_PULLUP);

pinMode(bt_up, INPUT_PULLUP);

pinMode(bt_down, INPUT_PULLUP);

pinMode(bt_start, INPUT_PULLUP);

pinMode(relay, OUTPUT);

pinMode(buzzer, OUTPUT);

lcd.begin();

lcd.clear();

lcd.setCursor(0,0);

lcd.print(" Welcome To ");

lcd.setCursor(0,1);

lcd.print("Countdown Timer");

tdown.setInterval(print_time, 999);

eeprom_read();

delay(1000);

lcd.clear();

}

void print_time(){

time_s = time_s-1;

if(time_s<0){time_s=59; time_m = time_m-1;}

if(time_m<0){time_m=59; time_h = time_h-1;}

}

void tdownComplete(){Serial.print("ok");}

//tdown.stop(); 

void loop(){

tdown.run();

if(digitalRead (bt_set) == 0){

if(flag1==0 && flag2==0){flag1=1;

set = set+1;

if(set>3){set=0;}

delay(100); 

}

}else{flag1=0;}

if(digitalRead (bt_up) == 0){

if(set==0){tdown.start(); flag2=1;}

if(set==1){time_s++;}

if(set==2){time_m++;}

if(set==3){time_h++;}

if(time_s>59){time_s=0;}

if(time_m>59){time_m=0;}

if(time_h>99){time_h=0;}

if(set>0){eeprom_write();}

delay(200); 

}

if(digitalRead (bt_down) == 0){

if(set==0){tdown.stop(); flag2=0;}

if(set==1){time_s--;}

if(set==2){time_m--;}

if(set==3){time_h--;}

if(time_s<0){time_s=59;}

if(time_m<0){time_m=59;}

if(time_h<0){time_h=99;}

if(set>0){eeprom_write();}

delay(200); 

}

if(digitalRead (bt_start) == 0){ flag2=1; 

  eeprom_read(); 

  digitalWrite(relay, HIGH); 

  tdown.restart(); 

  tdown.start();

}

lcd.setCursor(0,0);

if(set==0){lcd.print(" Timer ");}

if(set==1){lcd.print(" Set Timer SS ");}

if(set==2){lcd.print(" Set Timer MM ");}

if(set==3){lcd.print(" Set Timer HH ");}

lcd.setCursor(4,1);

if(time_h<=9){lcd.print("0");}

lcd.print(time_h);

lcd.print(":");

if(time_m<=9){lcd.print("0");}

lcd.print(time_m);

lcd.print(":");

if(time_s<=9){lcd.print("0");}

lcd.print(time_s);

lcd.print(" ");

if(time_s==0 && time_m==0 && time_h==0 && flag2==1){flag2=0;

tdown.stop(); 

digitalWrite(relay, LOW);

digitalWrite(buzzer, HIGH);

delay(300);

digitalWrite(buzzer, LOW);

delay(200);

digitalWrite(buzzer, HIGH);

delay(300);

digitalWrite(buzzer, LOW);

delay(200);

digitalWrite(buzzer, HIGH);

delay(300);

digitalWrite(buzzer, LOW);

}

if(flag2==1){digitalWrite(relay, HIGH);}

else{digitalWrite(relay, LOW);}

delay(1);

}

void eeprom_write(){

EEPROM.write(1, time_s);  

EEPROM.write(2, time_m);  

EEPROM.write(3, time_h);  

}

void eeprom_read(){

time_s = EEPROM.read(1);

time_m = EEPROM.read(2);

time_h = EEPROM.read(3);

}

ELIYAS SCIENCE INFO ©