In this example we will create a simple clock example using a DS1307 breakout, a keypad/LCD shield and an Arduino Uno
The DS1307 real-time clock is a low-power, full binary-coded decimal clock/calendar. Address and data are transferred over the I²C bus.The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The DS1307 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, this backup supply is usually in the form of a lithium ion battery.
Here is a picture of my setup, as you can see the DS1307 breakout is connected to the LCD and keypad shield, in this example you can see the time displayed on the LCD.
arduino clock
Layout
Here is how you wire up the DS1307 to your Arduino
VCC and GND connect to 5v and GND
SCL connects to A5
SDA connects to A4
arduino and ds1307 schematic
keypad ds1307
Code
You will need to download and copy the RTCLib into your ARduino libraries folder
https://github.com/getmicros/Arduino-Libraries/blob/master/RTClib-master.zip
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#include <Wire.h>
#include “RTClib.h”
#include <LiquidCrystal.h>
RTC_DS1307 rtc;
// Connections: Sainsmart LCD/Keypad shield
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
void setup()
{
//Serial.begin(9600);
Wire.begin();
rtc.begin();
//setup the LCD
lcd.begin(16, 2);
lcd.setCursor(0,0);
lcd.print(“Time”);
//debug the rtc
if (! rtc.isrunning())
{
//Serial.println(“RTC is NOT running!”);
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(__DATE__, __TIME__));
}
}
void loop()
{
DateTime now = rtc.now();
lcd.setCursor(0,1);
lcd.print(now.hour(), DEC);
lcd.setCursor(2,1);
lcd.print(“:”);
lcd.setCursor(3,1);
lcd.print(now.minute(), DEC);
lcd.setCursor(5,1);
lcd.print(“:”);
lcd.setCursor(6,1);
lcd.print(now.second(), DEC);
delay(1000);
}
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Links
LCD and Keypad Shield on Amazon US
ds1307 breakout on Amazon US
LCD and keypad shield on Amazon UK
ds1307 breakout on Amazon UK
