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project 17:Arduino Alarm Clock

Arduino Alarm Clock

In this project, we designed an Arduino based Real Time Clock with alarm. A Real Time Clock or RTC is a battery powered clock that measures time even when there is no external power or the microcontroller is reprogrammed.
An RTC displays clock and calendar with all timekeeping functions. The battery, which is connected to the RTC is a separate one and is not related or connected to the main power supply.

Components Required

  • Arduino UNO – 1  
  • DS 1307 RTC Module – 1
  • Push Buttons – 3
  • 16X2 LCD Display – 1  
  • Buzzer – 1
  • 10 KΩ – 2
  • 10 KΩ POT – 1

Code


#include <Wire.h>
#include<EEPROM.h>
#include <RTClib.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
RTC_DS1307 RTC;
int tmp,Inc,hor,mIn,add=11;
int set=8;
int cge=9;
int mod=10;
int off=0;
#define buz 11
int Hor,Min,Sec;
///////////////////////////////////////Function to adjust the time//////////////////////////////////
void time()
{
int tmp=1,mins=0,hors=0,secs=0;
while(tmp==1)
{
off=0;
if(digitalRead(cge)==0)
{
Hor++;
if(Hor==24)
{
Hor=0;
}
}
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Set Alarm Time ");
lcd.setCursor(0,1);
if(Hor<=9)
lcd.print("0");
lcd.print(Hor);
lcd.print(":");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
delay(200);
lcd.setCursor(0,1);
lcd.print(" ");
lcd.print(":");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
delay(200);
if(digitalRead(set)==0)
{
hor=Hor;
EEPROM.write(add++,hor);
tmp=2;
while(digitalRead(set)==0);
}
}
while(tmp==2)
{
if(digitalRead(cge)==0)
{
Min++;
if(Min==60)
{Min=0;}
}
lcd.setCursor(0,1);
lcd.print(Hor);
lcd.print(":");
if(Min<=9)
lcd.print("0");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
lcd.print(" ");
delay(200);
lcd.setCursor(0,1);
lcd.print(Hor);
lcd.print(":");
lcd.print(" ");
lcd.print(":");
lcd.print(Sec);
lcd.print(" ");
delay(200);
if(digitalRead(set)==0)
{
mIn=Min;
EEPROM.write(add++, mIn);
tmp=0;
while(digitalRead(set)==0);
}
}
off=1;
delay(10);
}
///////////////////////////////////////////function to sound the buzzer//////////////////////////////////
void Buz()
{
if(digitalRead(set)==0)
off=0;
if(off==1)
{
digitalWrite(buz,HIGH);
delay(500);
digitalWrite(buz, LOW);
delay(500);
}
}
//////////////////////////////////////////function to compare the alarm time with current RTC time//////////////////
void TimeCheck()
{
int tem[17];
for(int i=11;i<17;i++)
{
tem[i]=EEPROM.read(i);
}
if(Hor == tem[11] && Min == tem[12] && off==1)
{
add=11;
Buz();
Buz();
lcd.clear();
lcd.print("alarm...........");
lcd.setCursor(0,1);
lcd.print("...........alarm");
Buz();
Buz();
}
}
////////////////////////////////////////////////////////////setup///////////////////////////
void setup()
{
Wire.begin();
RTC.begin();
lcd.begin(16,2);
pinMode(cge, INPUT);
pinMode(set, INPUT);
pinMode(mod, INPUT);
pinMode(buz, OUTPUT);
digitalWrite(set, HIGH);
digitalWrite(mod, HIGH);
digitalWrite(cge, HIGH);
lcd.setCursor(0,0);
lcd.print("ELECTRONICS HUB");
lcd.setCursor(0,1);
lcd.print(" Alarm Clock ");
delay(2000);
if(!RTC.isrunning())
{
RTC.adjust(DateTime(__DATE__,__TIME__));
}
}
////////////////////////////////////////////////////////////loop/////////////////////////////////////
void loop()
{
DateTime now = RTC.now();
if(digitalRead(mod) == 0)
{
current();
time();
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" Alarm On");
delay(2000);
}
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Time:");
lcd.setCursor(6,0);
Hor=now.hour(),DEC;
if(Hor<=9)
{
lcd.print("0");
lcd.print(Hor=now.hour(),DEC);
}
else
lcd.print(Hor=now.hour(),DEC);
lcd.print(":");
Min=now.minute(),DEC;
if(Min<=9)
{
lcd.print("0");
lcd.print(Min=now.minute(),DEC);
}
else
lcd.print(Min=now.minute(),DEC);
lcd.print(":");
Sec=now.second(),DEC;
if(Sec<=9)
{
lcd.print("0");
lcd.print(Sec=now.second(),DEC);
}
else
lcd.print(Sec=now.second(),DEC);
lcd.setCursor(0,1);
lcd.print("Date: ");
lcd.print(now.day(),DEC);
lcd.print("/");
lcd.print(now.month(),DEC);
lcd.print("/");
lcd.print(now.year(),DEC);
TimeCheck();
delay(200);
}
///////////////////////////////////////////////////////function to get current RTC time//////////////////////////////
void current()
{
lcd.setCursor(0,1);
lcd.print(Hor);
lcd.print(":");
lcd.print(Min);
lcd.print(":");
lcd.print(Sec);
}
reaction: