Tutorial on how to use DS3231 RTC Module

Build a cool looking clock using RTC3231 and DS1306 OLED display

Jan 30, 2021

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ds3231

clock

Components and supplies

DS3231MPMB1 Peripheral Module

Arduino Nano R3

SSD1306 OLED display

Project description

Code

OLED clock using DS3231 RTC module

arduino

Working on Arduino Mega (needs more then 2kB of SRAM)

1//Marios Ideas
2//DS3231 Tutorial
3//Using DS3232.h library
4//Formating
5  date and time with dateFormat function (for Arduino board with >2kb SRAM)
6
7#include
8  <Wire.h>
9#include <DS3231.h>
10#include <Adafruit_GFX.h>
11#include <Adafruit_SSD1306.h>
12
13DS3231
14  clock;
15RTCDateTime dt;
16String txt;
17#define SCREEN_WIDTH 128 // OLED display
18  width, in pixels
19#define SCREEN_HEIGHT 64 // OLED display height, in pixels
20
21#define
22  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
23Adafruit_SSD1306
24  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
25
26void setup() {
27Serial.begin(9600);
28
29    clock.begin();
30  // Set sketch compiling time
31    clock.setDateTime(__DATE__,
32  __TIME__);
33   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
34
35  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
36
37    Serial.println(F("SSD1306 allocation failed"));
38    for(;;); // Don't proceed,
39  loop forever
40  }
41  display.display();
42    delay(2000); // Pause for 2 seconds
43
44
45    // Clear the buffer
46  display.clearDisplay();
47  display.display();
48
49}
50
51
52
53void
54  loop() {
55  dt = clock.getDateTime();
56
57  display.fillRect(0,0,128,16,SSD1306_WHITE);
58
59  display.fillRect(0,17,128,16,SSD1306_BLACK);
60  display.fillRect(0,31,128,33,SSD1306_WHITE);
61
62
63    display.setCursor(1,1); 
64    display.setTextSize(2);
65    display.setTextColor(SSD1306_BLACK);
66  
67    display.println(clock.dateFormat("l", dt)); 
68
69  display.setCursor(1,18);
70  
71  display.setTextSize(1);
72  display.setTextColor(SSD1306_WHITE); 
73  display.println(clock.dateFormat("M
74  jS Y ", dt));
75
76    display.setCursor(3,35); 
77    display.setTextSize(3);
78  
79    display.setTextColor(SSD1306_BLACK); 
80    display.println(clock.dateFormat("H:i",
81  dt));
82
83  display.setCursor(100,35); 
84  display.setTextSize(2);
85  display.setTextColor(SSD1306_BLACK);
86  
87  display.println(clock.dateFormat("s", dt));
88
89  
90  display.display();
91
92
93
94  delay(1000);
95}

//Marios Ideas
//DS3231 Tutorial
//Using DS3232.h library
//Formating
  date and time with dateFormat function (for Arduino board with >2kb SRAM)

#include
  <Wire.h>
#include <DS3231.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

DS3231
  clock;
RTCDateTime dt;
String txt;
#define SCREEN_WIDTH 128 // OLED display
  width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define
  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306
  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
Serial.begin(9600);

    clock.begin();
  // Set sketch compiling time
    clock.setDateTime(__DATE__,
  __TIME__);
   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64

    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed,
  loop forever
  }
  display.display();
    delay(2000); // Pause for 2 seconds


    // Clear the buffer
  display.clearDisplay();
  display.display();

}



void
  loop() {
  dt = clock.getDateTime();

  display.fillRect(0,0,128,16,SSD1306_WHITE);

  display.fillRect(0,17,128,16,SSD1306_BLACK);
  display.fillRect(0,31,128,33,SSD1306_WHITE);


    display.setCursor(1,1); 
    display.setTextSize(2);
    display.setTextColor(SSD1306_BLACK);
  
    display.println(clock.dateFormat("l", dt)); 

  display.setCursor(1,18);
  
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE); 
  display.println(clock.dateFormat("M
  jS Y ", dt));

    display.setCursor(3,35); 
    display.setTextSize(3);
  
    display.setTextColor(SSD1306_BLACK); 
    display.println(clock.dateFormat("H:i",
  dt));

  display.setCursor(100,35); 
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);
  
  display.println(clock.dateFormat("s", dt));

  
  display.display();



  delay(1000);
}

OLED clock using DS3231 RTC module with the memory problem fix

arduino

Working on all arduino boards

1//Marios Ideas
2//DS3231 Tutorial
3//Using DS3232.h library
4//Formating
5  date and time with custom functions
6
7#include <Wire.h>
8#include <DS3231.h>
9#include
10  <Adafruit_GFX.h>
11#include <Adafruit_SSD1306.h>
12
13int pause=1000;
14
15DS3231
16  clock;
17RTCDateTime dt;
18
19#define SCREEN_WIDTH 128 // OLED display width,
20  in pixels
21#define SCREEN_HEIGHT 64 // OLED display height, in pixels
22
23
24#define
25  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
26Adafruit_SSD1306
27  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
28
29void setup() {
30Serial.begin(9600);
31
32    clock.begin();
33  // Set sketch compiling time
34    clock.setDateTime(__DATE__,
35  __TIME__);
36 
37   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V
38  internally
39  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D
40  for 128x64
41    Serial.println(F("SSD1306 allocation failed"));
42    for(;;);
43  // Don't proceed, loop forever
44  }
45  display.display(); //display initial
46  Adafruit logo
47    delay(2000); 
48
49  // Clear the buffer
50  display.clearDisplay();
51  
52  display.display();
53
54}
55
56String DayOfTheWeek(uint8_t Day){
57  String
58  DayText;
59  if (Day==1)  DayText="Monday";
60  if (Day==2)  DayText="Tuesday";
61
62  if (Day==3)  DayText="Wednesday";
63  if (Day==4)  DayText="Thursday";
64
65  if (Day==5)  DayText="Friday";
66  if (Day==6)  DayText="Saturday";
67  if
68  (Day==7)  DayText="Sunday";
69  return DayText;
70}
71
72
73
74String DayMonthYear(uint8_t
75  Day,uint8_t Month,uint16_t Year){
76  String DayMonthYearText;
77  if (Month==1)
78  DayMonthYearText="JAN ";
79  if (Month==2)  DayMonthYearText="FEB ";
80
81  if (Month==3)  DayMonthYearText="MAR ";
82  if (Month==4)  DayMonthYearText="APR
83  ";
84  if (Month==5)  DayMonthYearText="MAY ";
85  if (Month==6)  DayMonthYearText="JUN
86  ";
87  if (Month==7)  DayMonthYearText="JUL ";
88  if (Month==8)  DayMonthYearText="AUG
89  ";
90  if (Month==9)  DayMonthYearText="SEP ";
91  if (Month==10)  DayMonthYearText="OCT
92  ";
93  if (Month==11)  DayMonthYearText="NOV ";
94  if (Month==12)  DayMonthYearText="DEC
95  ";
96
97  DayMonthYearText=DayMonthYearText+Day;
98  if (Day==1)DayMonthYearText=DayMonthYearText+"st
99  ";
100  if (Day==2)DayMonthYearText=DayMonthYearText+"nd ";
101  if (Day>2)DayMonthYearText=DayMonthYearText+"th
102  ";
103
104  DayMonthYearText=DayMonthYearText+Year;
105  
106  return DayMonthYearText;
107}
108
109String
110  AddLeadingZero(uint8_t x){
111  String AddLeadingZeroText;
112  if(x<10) AddLeadingZeroText="0";
113  
114  else AddLeadingZeroText=""; 
115  AddLeadingZeroText=AddLeadingZeroText+x;
116
117  return AddLeadingZeroText;
118}
119
120String CurrentTime(uint8_t H, uint8_t I
121  ){
122  String CurrentTimeText="";
123  CurrentTimeText=CurrentTimeText + AddLeadingZero(H)
124  +":"+AddLeadingZero(I);
125  return CurrentTimeText;
126}
127
128void loop() {
129
130  dt = clock.getDateTime();
131
132  display.fillRect(0,0,128,16,SSD1306_WHITE);
133
134  display.fillRect(0,17,128,16,SSD1306_BLACK);
135  display.fillRect(0,31,128,33,SSD1306_WHITE);
136
137
138    display.setCursor(1,1); 
139    display.setTextSize(2);
140    display.setTextColor(SSD1306_BLACK);
141  
142    display.println(DayOfTheWeek(dt.dayOfWeek));
143
144  display.setCursor(1,18);
145  
146  display.setTextSize(1);
147  display.setTextColor(SSD1306_WHITE); 
148  display.println(DayMonthYear(dt.day,dt.month,dt.year));
149
150
151    display.setCursor(3,35); 
152    display.setTextSize(3);  
153    display.setTextColor(SSD1306_BLACK);
154  
155    display.println(CurrentTime(dt.hour,dt.minute));
156
157  display.setCursor(100,35);
158  
159  display.setTextSize(2);
160  display.setTextColor(SSD1306_BLACK); 
161  display.println(AddLeadingZero(dt.second));
162
163
164  clock.forceConversion();
165  display.setCursor(85,18); 
166  display.setTextSize(1);
167display.setTextColor(SSD1306_WHITE);
168  
169display.print(clock.readTemperature());
170display.setCursor(117,16); 
171display.print("o");
172
173
174
175  display.display();
176  delay(1000);
177}

//Marios Ideas
//DS3231 Tutorial
//Using DS3232.h library
//Formating
  date and time with custom functions

#include <Wire.h>
#include <DS3231.h>
#include
  <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

int pause=1000;

DS3231
  clock;
RTCDateTime dt;

#define SCREEN_WIDTH 128 // OLED display width,
  in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels


#define
  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306
  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
Serial.begin(9600);

    clock.begin();
  // Set sketch compiling time
    clock.setDateTime(__DATE__,
  __TIME__);
 
   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V
  internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D
  for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  // Don't proceed, loop forever
  }
  display.display(); //display initial
  Adafruit logo
    delay(2000); 

  // Clear the buffer
  display.clearDisplay();
  
  display.display();

}

String DayOfTheWeek(uint8_t Day){
  String
  DayText;
  if (Day==1)  DayText="Monday";
  if (Day==2)  DayText="Tuesday";

  if (Day==3)  DayText="Wednesday";
  if (Day==4)  DayText="Thursday";

  if (Day==5)  DayText="Friday";
  if (Day==6)  DayText="Saturday";
  if
  (Day==7)  DayText="Sunday";
  return DayText;
}



String DayMonthYear(uint8_t
  Day,uint8_t Month,uint16_t Year){
  String DayMonthYearText;
  if (Month==1)
  DayMonthYearText="JAN ";
  if (Month==2)  DayMonthYearText="FEB ";

  if (Month==3)  DayMonthYearText="MAR ";
  if (Month==4)  DayMonthYearText="APR
  ";
  if (Month==5)  DayMonthYearText="MAY ";
  if (Month==6)  DayMonthYearText="JUN
  ";
  if (Month==7)  DayMonthYearText="JUL ";
  if (Month==8)  DayMonthYearText="AUG
  ";
  if (Month==9)  DayMonthYearText="SEP ";
  if (Month==10)  DayMonthYearText="OCT
  ";
  if (Month==11)  DayMonthYearText="NOV ";
  if (Month==12)  DayMonthYearText="DEC
  ";

  DayMonthYearText=DayMonthYearText+Day;
  if (Day==1)DayMonthYearText=DayMonthYearText+"st
  ";
  if (Day==2)DayMonthYearText=DayMonthYearText+"nd ";
  if (Day>2)DayMonthYearText=DayMonthYearText+"th
  ";

  DayMonthYearText=DayMonthYearText+Year;
  
  return DayMonthYearText;
}

String
  AddLeadingZero(uint8_t x){
  String AddLeadingZeroText;
  if(x<10) AddLeadingZeroText="0";
  
  else AddLeadingZeroText=""; 
  AddLeadingZeroText=AddLeadingZeroText+x;

  return AddLeadingZeroText;
}

String CurrentTime(uint8_t H, uint8_t I
  ){
  String CurrentTimeText="";
  CurrentTimeText=CurrentTimeText + AddLeadingZero(H)
  +":"+AddLeadingZero(I);
  return CurrentTimeText;
}

void loop() {

  dt = clock.getDateTime();

  display.fillRect(0,0,128,16,SSD1306_WHITE);

  display.fillRect(0,17,128,16,SSD1306_BLACK);
  display.fillRect(0,31,128,33,SSD1306_WHITE);


    display.setCursor(1,1); 
    display.setTextSize(2);
    display.setTextColor(SSD1306_BLACK);
  
    display.println(DayOfTheWeek(dt.dayOfWeek));

  display.setCursor(1,18);
  
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE); 
  display.println(DayMonthYear(dt.day,dt.month,dt.year));


    display.setCursor(3,35); 
    display.setTextSize(3);  
    display.setTextColor(SSD1306_BLACK);
  
    display.println(CurrentTime(dt.hour,dt.minute));

  display.setCursor(100,35);
  
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK); 
  display.println(AddLeadingZero(dt.second));


  clock.forceConversion();
  display.setCursor(85,18); 
  display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
  
display.print(clock.readTemperature());
display.setCursor(117,16); 
display.print("o");



  display.display();
  delay(1000);
}

OLED clock using DS3231 RTC module

arduino

Working on Arduino Mega (needs more then 2kB of SRAM)

1//Marios Ideas
2//DS3231 Tutorial
3//Using DS3232.h library
4//Formating  date and time with dateFormat function (for Arduino board with >2kb SRAM)
5
6#include  <Wire.h>
7#include <DS3231.h>
8#include <Adafruit_GFX.h>
9#include <Adafruit_SSD1306.h>
10
11DS3231  clock;
12RTCDateTime dt;
13String txt;
14#define SCREEN_WIDTH 128 // OLED display  width, in pixels
15#define SCREEN_HEIGHT 64 // OLED display height, in pixels
16
17#define  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
18Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
19
20void setup() {
21Serial.begin(9600);
22    clock.begin();
23  // Set sketch compiling time
24    clock.setDateTime(__DATE__,  __TIME__);
25   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
26  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
27    Serial.println(F("SSD1306 allocation failed"));
28    for(;;); // Don't proceed,  loop forever
29  }
30  display.display();
31    delay(2000); // Pause for 2 seconds
32
33    // Clear the buffer
34  display.clearDisplay();
35  display.display();
36
37}
38
39
40
41void  loop() {
42  dt = clock.getDateTime();
43
44  display.fillRect(0,0,128,16,SSD1306_WHITE);
45  display.fillRect(0,17,128,16,SSD1306_BLACK);
46  display.fillRect(0,31,128,33,SSD1306_WHITE);
47
48    display.setCursor(1,1); 
49    display.setTextSize(2);
50    display.setTextColor(SSD1306_BLACK);  
51    display.println(clock.dateFormat("l", dt)); 
52
53  display.setCursor(1,18);  
54  display.setTextSize(1);
55  display.setTextColor(SSD1306_WHITE); 
56  display.println(clock.dateFormat("M  jS Y ", dt));
57
58    display.setCursor(3,35); 
59    display.setTextSize(3);  
60    display.setTextColor(SSD1306_BLACK); 
61    display.println(clock.dateFormat("H:i",  dt));
62
63  display.setCursor(100,35); 
64  display.setTextSize(2);
65  display.setTextColor(SSD1306_BLACK);  
66  display.println(clock.dateFormat("s", dt));
67
68  
69  display.display();
70
71
72  delay(1000);
73}

//Marios Ideas
//DS3231 Tutorial
//Using DS3232.h library
//Formating  date and time with dateFormat function (for Arduino board with >2kb SRAM)

#include  <Wire.h>
#include <DS3231.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

DS3231  clock;
RTCDateTime dt;
String txt;
#define SCREEN_WIDTH 128 // OLED display  width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
Serial.begin(9600);
    clock.begin();
  // Set sketch compiling time
    clock.setDateTime(__DATE__,  __TIME__);
   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed,  loop forever
  }
  display.display();
    delay(2000); // Pause for 2 seconds

    // Clear the buffer
  display.clearDisplay();
  display.display();

}



void  loop() {
  dt = clock.getDateTime();

  display.fillRect(0,0,128,16,SSD1306_WHITE);
  display.fillRect(0,17,128,16,SSD1306_BLACK);
  display.fillRect(0,31,128,33,SSD1306_WHITE);

    display.setCursor(1,1); 
    display.setTextSize(2);
    display.setTextColor(SSD1306_BLACK);  
    display.println(clock.dateFormat("l", dt)); 

  display.setCursor(1,18);  
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE); 
  display.println(clock.dateFormat("M  jS Y ", dt));

    display.setCursor(3,35); 
    display.setTextSize(3);  
    display.setTextColor(SSD1306_BLACK); 
    display.println(clock.dateFormat("H:i",  dt));

  display.setCursor(100,35); 
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK);  
  display.println(clock.dateFormat("s", dt));

  
  display.display();


  delay(1000);
}

OLED clock using DS3231 RTC module with the memory problem fix

arduino

Working on all arduino boards

1//Marios Ideas
2//DS3231 Tutorial
3//Using DS3232.h library
4//Formating  date and time with custom functions
5
6#include <Wire.h>
7#include <DS3231.h>
8#include  <Adafruit_GFX.h>
9#include <Adafruit_SSD1306.h>
10
11int pause=1000;
12
13DS3231  clock;
14RTCDateTime dt;
15
16#define SCREEN_WIDTH 128 // OLED display width,  in pixels
17#define SCREEN_HEIGHT 64 // OLED display height, in pixels
18
19
20#define  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
21Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
22
23void setup() {
24Serial.begin(9600);
25    clock.begin();
26  // Set sketch compiling time
27    clock.setDateTime(__DATE__,  __TIME__);
28 
29   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V  internally
30  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D  for 128x64
31    Serial.println(F("SSD1306 allocation failed"));
32    for(;;);  // Don't proceed, loop forever
33  }
34  display.display(); //display initial  Adafruit logo
35    delay(2000); 
36
37  // Clear the buffer
38  display.clearDisplay();  
39  display.display();
40
41}
42
43String DayOfTheWeek(uint8_t Day){
44  String  DayText;
45  if (Day==1)  DayText="Monday";
46  if (Day==2)  DayText="Tuesday";
47  if (Day==3)  DayText="Wednesday";
48  if (Day==4)  DayText="Thursday";
49  if (Day==5)  DayText="Friday";
50  if (Day==6)  DayText="Saturday";
51  if  (Day==7)  DayText="Sunday";
52  return DayText;
53}
54
55
56
57String DayMonthYear(uint8_t  Day,uint8_t Month,uint16_t Year){
58  String DayMonthYearText;
59  if (Month==1)  DayMonthYearText="JAN ";
60  if (Month==2)  DayMonthYearText="FEB ";
61  if (Month==3)  DayMonthYearText="MAR ";
62  if (Month==4)  DayMonthYearText="APR  ";
63  if (Month==5)  DayMonthYearText="MAY ";
64  if (Month==6)  DayMonthYearText="JUN  ";
65  if (Month==7)  DayMonthYearText="JUL ";
66  if (Month==8)  DayMonthYearText="AUG  ";
67  if (Month==9)  DayMonthYearText="SEP ";
68  if (Month==10)  DayMonthYearText="OCT  ";
69  if (Month==11)  DayMonthYearText="NOV ";
70  if (Month==12)  DayMonthYearText="DEC  ";
71
72  DayMonthYearText=DayMonthYearText+Day;
73  if (Day==1)DayMonthYearText=DayMonthYearText+"st  ";
74  if (Day==2)DayMonthYearText=DayMonthYearText+"nd ";
75  if (Day>2)DayMonthYearText=DayMonthYearText+"th  ";
76
77  DayMonthYearText=DayMonthYearText+Year;
78  
79  return DayMonthYearText;
80}
81
82String  AddLeadingZero(uint8_t x){
83  String AddLeadingZeroText;
84  if(x<10) AddLeadingZeroText="0";  
85  else AddLeadingZeroText=""; 
86  AddLeadingZeroText=AddLeadingZeroText+x;
87  return AddLeadingZeroText;
88}
89
90String CurrentTime(uint8_t H, uint8_t I  ){
91  String CurrentTimeText="";
92  CurrentTimeText=CurrentTimeText + AddLeadingZero(H)  +":"+AddLeadingZero(I);
93  return CurrentTimeText;
94}
95
96void loop() {
97  dt = clock.getDateTime();
98
99  display.fillRect(0,0,128,16,SSD1306_WHITE);
100  display.fillRect(0,17,128,16,SSD1306_BLACK);
101  display.fillRect(0,31,128,33,SSD1306_WHITE);
102
103    display.setCursor(1,1); 
104    display.setTextSize(2);
105    display.setTextColor(SSD1306_BLACK);  
106    display.println(DayOfTheWeek(dt.dayOfWeek));
107
108  display.setCursor(1,18);  
109  display.setTextSize(1);
110  display.setTextColor(SSD1306_WHITE); 
111  display.println(DayMonthYear(dt.day,dt.month,dt.year));
112
113    display.setCursor(3,35); 
114    display.setTextSize(3);  
115    display.setTextColor(SSD1306_BLACK);  
116    display.println(CurrentTime(dt.hour,dt.minute));
117
118  display.setCursor(100,35);  
119  display.setTextSize(2);
120  display.setTextColor(SSD1306_BLACK); 
121  display.println(AddLeadingZero(dt.second));
122
123  clock.forceConversion();
124  display.setCursor(85,18); 
125  display.setTextSize(1);
126display.setTextColor(SSD1306_WHITE);  
127display.print(clock.readTemperature());
128display.setCursor(117,16); 
129display.print("o");
130
131
132  display.display();
133  delay(1000);
134}

//Marios Ideas
//DS3231 Tutorial
//Using DS3232.h library
//Formating  date and time with custom functions

#include <Wire.h>
#include <DS3231.h>
#include  <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

int pause=1000;

DS3231  clock;
RTCDateTime dt;

#define SCREEN_WIDTH 128 // OLED display width,  in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels


#define  OLED_RESET     -1// Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
Serial.begin(9600);
    clock.begin();
  // Set sketch compiling time
    clock.setDateTime(__DATE__,  __TIME__);
 
   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V  internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D  for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);  // Don't proceed, loop forever
  }
  display.display(); //display initial  Adafruit logo
    delay(2000); 

  // Clear the buffer
  display.clearDisplay();  
  display.display();

}

String DayOfTheWeek(uint8_t Day){
  String  DayText;
  if (Day==1)  DayText="Monday";
  if (Day==2)  DayText="Tuesday";
  if (Day==3)  DayText="Wednesday";
  if (Day==4)  DayText="Thursday";
  if (Day==5)  DayText="Friday";
  if (Day==6)  DayText="Saturday";
  if  (Day==7)  DayText="Sunday";
  return DayText;
}



String DayMonthYear(uint8_t  Day,uint8_t Month,uint16_t Year){
  String DayMonthYearText;
  if (Month==1)  DayMonthYearText="JAN ";
  if (Month==2)  DayMonthYearText="FEB ";
  if (Month==3)  DayMonthYearText="MAR ";
  if (Month==4)  DayMonthYearText="APR  ";
  if (Month==5)  DayMonthYearText="MAY ";
  if (Month==6)  DayMonthYearText="JUN  ";
  if (Month==7)  DayMonthYearText="JUL ";
  if (Month==8)  DayMonthYearText="AUG  ";
  if (Month==9)  DayMonthYearText="SEP ";
  if (Month==10)  DayMonthYearText="OCT  ";
  if (Month==11)  DayMonthYearText="NOV ";
  if (Month==12)  DayMonthYearText="DEC  ";

  DayMonthYearText=DayMonthYearText+Day;
  if (Day==1)DayMonthYearText=DayMonthYearText+"st  ";
  if (Day==2)DayMonthYearText=DayMonthYearText+"nd ";
  if (Day>2)DayMonthYearText=DayMonthYearText+"th  ";

  DayMonthYearText=DayMonthYearText+Year;
  
  return DayMonthYearText;
}

String  AddLeadingZero(uint8_t x){
  String AddLeadingZeroText;
  if(x<10) AddLeadingZeroText="0";  
  else AddLeadingZeroText=""; 
  AddLeadingZeroText=AddLeadingZeroText+x;
  return AddLeadingZeroText;
}

String CurrentTime(uint8_t H, uint8_t I  ){
  String CurrentTimeText="";
  CurrentTimeText=CurrentTimeText + AddLeadingZero(H)  +":"+AddLeadingZero(I);
  return CurrentTimeText;
}

void loop() {
  dt = clock.getDateTime();

  display.fillRect(0,0,128,16,SSD1306_WHITE);
  display.fillRect(0,17,128,16,SSD1306_BLACK);
  display.fillRect(0,31,128,33,SSD1306_WHITE);

    display.setCursor(1,1); 
    display.setTextSize(2);
    display.setTextColor(SSD1306_BLACK);  
    display.println(DayOfTheWeek(dt.dayOfWeek));

  display.setCursor(1,18);  
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE); 
  display.println(DayMonthYear(dt.day,dt.month,dt.year));

    display.setCursor(3,35); 
    display.setTextSize(3);  
    display.setTextColor(SSD1306_BLACK);  
    display.println(CurrentTime(dt.hour,dt.minute));

  display.setCursor(100,35);  
  display.setTextSize(2);
  display.setTextColor(SSD1306_BLACK); 
  display.println(AddLeadingZero(dt.second));

  clock.forceConversion();
  display.setCursor(85,18); 
  display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);  
display.print(clock.readTemperature());
display.setCursor(117,16); 
display.print("o");


  display.display();
  delay(1000);
}

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