There is a new version using Time.h library and showing weekday.
Output:
Sketch:
// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
// 2010-02-04 <jcw@equi4.com> http://opensource.org/licenses/mit-license.php
// $Id: ds1307.pde 4773 2010-02-04 14:09:18Z jcw $
// Added LCD display and LM35 temperature function by Befun Hung 2011-10-13
// Take out displayDateTime procedure from loop() by Befun Hung 2013-05-03
// The sketch works on Arduino IDE 0022
#include <Wire.h>
#include <RTClib.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
RTC_DS1307 RTC;
// change potPin value to 0, 1, 2 for A0, A1, A2 respectly
int potPin = 3;
float temperature = 0;
void setup () {
Serial.begin(9600);
Wire.begin();
RTC.begin();
lcd.begin(16, 2);
lcd.print("*cheaphousetek*");
delay(5000);
lcd.clear();
// following line sets the RTC to the date & time this sketch was compiled
// RTC.adjust(DateTime(__DATE__, __TIME__));
}
void loop() {
displayDateTime();
}
void printTenths(long value) {
// prints a value of 123 as 12.3
Serial.print(value / 10);
Serial.print('.');
Serial.print(value % 10);
Serial.println();
lcd.setCursor(10, 1);
lcd.print(value / 10);
lcd.setCursor(12, 1);
lcd.print('.');
lcd.setCursor(13, 1);
lcd.print(value % 10);
}
void displayDateTime() {
DateTime now = RTC.now();
int span = 10;
long aRead = 0;
unsigned long tmp;
tmp = now.year();
Serial.print(now.year(), DEC);
lcd.setCursor(0, 0);
lcd.print(tmp);
Serial.print('/');
lcd.setCursor(4, 0);
lcd.print("-");
tmp = now.month();
if (now.month() < 10) {
Serial.print('0');
Serial.print(now.month(), DEC);
lcd.setCursor(5, 0);
lcd.print('0');
lcd.setCursor(6, 0);
lcd.print(tmp);
}
else {
Serial.print(now.month(), DEC);
lcd.setCursor(5, 0);
lcd.print(tmp);
}
Serial.print('/');
lcd.setCursor(7, 0);
lcd.print('-');
tmp = now.day();
if (now.day() < 10) {
Serial.print('0');
Serial.print(now.day());
lcd.setCursor(8, 0);
lcd.print('0');
lcd.setCursor(9, 0);
lcd.print(tmp);
}
else {
Serial.print(now.day(), DEC);
lcd.setCursor(8, 0);
lcd.print(tmp);
}
Serial.print(' ');
tmp = now.hour();
if (now.hour() < 10) {
Serial.print('0');
Serial.print(now.hour(), DEC);
lcd.setCursor(0, 1);
lcd.print('0');
lcd.setCursor(1, 1);
lcd.print(tmp);
}
else {
Serial.print(now.hour(), DEC);
lcd.setCursor(0, 1);
lcd.print(tmp);
}
Serial.print(':');
lcd.setCursor(2, 1);
lcd.print(':');
tmp = now.minute();
if (now.minute() < 10) {
Serial.print('0');
Serial.print(now.minute(), DEC);
lcd.setCursor(3, 1);
lcd.print('0');
lcd.setCursor(4, 1);
lcd.print(tmp);
}
else {
Serial.print(now.minute(), DEC);
lcd.setCursor(3, 1);
lcd.print(tmp);
}
Serial.print(':');
lcd.setCursor(5, 1);
lcd.print(':');
tmp = now.second();
if (now.second() < 10) {
Serial.print('0');
Serial.print(now.second(), DEC);
lcd.setCursor(6, 1);
lcd.print('0');
lcd.setCursor(7, 1);
lcd.print(tmp);
}
else {
Serial.print(now.second(), DEC);
lcd.setCursor(6, 1);
lcd.print(tmp);
}
Serial.print (' ');
lcd.setCursor(8, 1);
lcd.print(' ');
// Serial.println();
for (int i=0;i<span;i++) {
aRead = aRead + analogRead(potPin);
// Serial.print(aRead);
// Serial.print(' ');
}
// aRead = aRead / span;
temperature = (aRead / span * 500.0 / 1024.0);
// Serial.print(aRead);
// Serial.print(' ');
// Serial.print(temperature);
// Serial.print(' ');
printTenths(long (temperature * 10));
lcd.setCursor(14, 1);
lcd.print(char(223));
lcd.setCursor(15, 1);
lcd.print('C');
delay(200);
// Serial.print(" since 2000 = ");
// Serial.print(now.get());
// Serial.print("s = ");
// Serial.print(now.get() / 86400L);
// Serial.println("d");
// calculate a date which is 7 days and 30 seconds into the future
// DateTime future (now.get() + 7 * 86400L + 30);
// Serial.print(" now + 7d + 30s: ");
// Serial.print(future.year(), DEC);
// Serial.print('/');
// Serial.print(future.month(), DEC);
// Serial.print('/');
// Serial.print(future.day(), DEC);
// Serial.print(' ');
// Serial.print(future.hour(), DEC);
// Serial.print(':');
// Serial.print(future.minute(), DEC);
// Serial.print(':');
// Serial.print(future.second(), DEC);
// Serial.println();
// Serial.println();
// delay(3000);
}
