Arduino code for DS3231 RTC, photo resistor and 16x2 LCD

light_ds3231rtc_lcd.ino

// Include LCD Library Code
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

// Include the DS3231 RTC Library
#include  <DS3231.h>

//Photoresistor Pin
int lightPin = 0;

//Initialise the LCD
LiquidCrystal_I2C lcd(0x27,16,2);

//initialize the DS3231 rtc
DS3231  rtc(SDA, SCL);
Time  t;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
  rtc.begin();
  lcd.init();
  lcd.clear();
  //rtc.setDOW(SATURDAY);     // Set Day-of-Week to SUNDAY
  //rtc.setTime(22, 11, 0);     // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(27, 1, 2018);   // Set the date to 27th January 2018 (dd, mm, yyyy)
}

void loop() {
  // put your main code here, to run repeatedly:
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Pushkar Sheth");  
lcd.setCursor(0,1);

int lightLevel = analogRead(lightPin);
lightLevel = map(lightLevel,0,1024,2000,0);
lightLevel = constrain(lightLevel,0,2000);
t = rtc.getTime();
Serial.print(",");      // this comma exist so that the annoying b' can be separated from the further variables in the string.
                        // this also makes the output easier to be processed by the next step.

Serial.print(lightLevel);
Serial.print(",");
Serial.print(t.year);
Serial.print(",");
Serial.print(t.mon);
Serial.print(",");
Serial.print(t.date);
Serial.print(",");
Serial.print(t.hour);
Serial.print(",");
Serial.print(t.min);
Serial.print(",");
Serial.print(t.sec);
Serial.println(",");
delay(1000);
}