Install the required library in Arduino IDE software.
Before compiling the code Install the following libraries.
RTC library:
Go to – Sketch >Include Library > Manage Libraries
and install the library shown in the image below.
I2C LCD library:
Go to – Sketch >Include Library > Manage Libraries
and install the library shown in the image below.
Arduino Code:
After installing the library upload the below code to your Arduino board.
You can also download the code here. Download Arduino Code
// Date and time functions using a DS3231 RTC connected via I2C and Wire lib
#include "RTClib.h"
// LCD I2C Libraries
#include <LiquidCrystal_PCF8574.h>
#include <Wire.h>
// declare LCD with the address.
LiquidCrystal_PCF8574 lcd(0x27); // set the LCD address to 0x27 for a 16 chars and 2 line display
int lcd_show = -1;
RTC_DS3231 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
void setup () {
Serial.begin(57600);
// lcd function
int error;
Serial.println("Dose: check for LCD");
// See http://playground.arduino.cc/Main/I2cScanner how to test for a I2C device.
Wire.begin();
Wire.beginTransmission(0x27);
error = Wire.endTransmission();
Serial.print("Error: ");
Serial.print(error);
if (error == 0) {
Serial.println(": LCD found.");
lcd_show = 1;
lcd.begin(16, 2); // initialize the lcd
} else {
Serial.println(": LCD not found.");
} // if
if (lcd_show == 1) {
lcd.setBacklight(255);
lcd.home();
lcd.clear();
lcd.print("Designed by-");
lcd.setCursor(0, 1);
lcd.print("Your Name");
lcd.noBlink();
}
delay(1000);
// lcd function ends
// RTC setup function starts
#ifndef ESP8266
while (!Serial); // wait for serial port to connect. Needed for native USB
#endif
if (! rtc.begin()) {
Serial.println("Couldn't find RTC");
Serial.flush();
abort();
}
if (rtc.lostPower()) {
Serial.println("RTC lost power, let's set the time!");
// When time needs to be set on a new device, or after a power loss, the
// following line sets the RTC to the date & time this sketch was compiled
//rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
rtc.adjust(DateTime(2020, 12, 02, 15, 25, 0));
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}
// When time needs to be re-set on a previously configured device, the
// following line sets the RTC to the date & time this sketch was compiled
// rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}
void loop () {
if (lcd_show == 1) {
lcd.setBacklight(255);
lcd.home();
lcd.clear();
lcd.print("Hello LCD");
lcd.noBlink();
}
DateTime now = rtc.now();
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(" (");
Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
Serial.print(") ");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
Serial.print("Temperature: ");
Serial.print(rtc.getTemperature());
Serial.println(" C");
Serial.println();
//LCD printing
if (lcd_show == 1) {
lcd.setBacklight(255);
lcd.home();
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Time - ");
lcd.setCursor(7, 0);
lcd.print(now.hour());
lcd.print(":");
if(now.minute()<10){
lcd.print("0");
}
lcd.print(now.minute());
lcd.print(":");
lcd.print(now.second());
lcd.setCursor(0, 1);
lcd.print(now.day());
lcd.print("-");
lcd.print(now.month());
lcd.print("-");
lcd.print(now.year());
lcd.setCursor(13, 1);
lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
lcd.noBlink();
}
delay(1000);
}
Troubleshooting:
1. RTC Library not Install
Solution:
On compiling/uploading the code you see the above error then install the library as explained at the beginning of the tutorial.
2. I2C LCD Library not install.
Solution:
On compiling/uploading the code you see the above error then install the library as explained at the beginning of the tutorial.