Oled clock on nano with rtc DS1302

Easy clock project using Arduino nano and RTC DS1302 module with an Oled SSD1306 Display

May 5, 2022

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Components and supplies

Breadboard and hook up wire

rtc ds1302 module

Arduino Nano

Graphic OLED, 128 x 64

Project description

Code

Tweaked Updated Display

arduino

1
2#include <Arduino.h>
3#include <Ds1302.h>
4#include <LowPower.h>
5
6  // DS1302 RTC instance
7Ds1302 rtc(9,7,8); // RST , CLK , DAT
8
9#include  <SPI.h>
10#include <Wire.h>
11#include <Adafruit_GFX.h>
12#include <Adafruit_SSD1306.h>
13
14#define  SCREEN_WIDTH 128 // OLED display width, in pixels
15#define SCREEN_HEIGHT 32 //  OLED display height
16
17// Declaration for an SSD1306 display connected to I2C  (SDA, SCL pins)
18// The pins for I2C are defined by the Wire-library. 
19
20#define  OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
21#define  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
22Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
23
24
25const static  char* WeekDays[] =
26{
27    "Monday    ",
28    "Tuesday   ",
29    "Wednesday  ",
30    "Thursday  ",
31    "Friday    ",
32    "Saturday  ",
33    "Sunday    "
34};
35const static char* MonthText[] =
36{
37    "Jan",
38    "Feb",
39    "Mar",
40    "Apr",
41    "May",
42    "Jun",
43    "Jul",
44    "Aug",
45    "Sep",
46    "Oct",
47    "Nov",
48    "Dec"
49};
50
51
52void  setup() {
53  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
54    Serial.println(F("SSD1306  allocation failed"));
55    for(;;); // Don't proceed, loop forever
56  }
57   
58    rtc.init(); // initialize the RTC
59    display.clearDisplay();   //  clears the screen and buffer
60    display.drawLine(12,18,112,18,WHITE);
61    
62}
63
64
65void  loop()
66{
67
68    // get the current time
69    Ds1302::DateTime now;
70    rtc.getDateTime(&now);
71    static uint8_t last_second = 0;
72    if (last_second  != now.second)
73    {
74        last_second = now.second;
75        display.setTextColor(SSD1306_WHITE);
76        display.setTextSize(2);
77        display.setCursor(15,2);
78        if  (now.hour <= 9) { //If Hour is single figures, put a 0 in front
79        display.print("0");
80        }
81        display.print(now.hour);
82        display.print(":");
83     if (now.minute <= 9) {  //If Minute is single figures, put a 0 in front
84        display.print("0");
85     }
86        display.print(now.minute);
87        display.print(":"); 
88        if (now.second <= 9) {  //If Seconds is  single figures, put a 0 in front
89        display.print("0");
90     } 
91        display.print(now.second);
92
93        display.setTextSize(1);
94        display.setCursor(17,22);
95        display.print(WeekDays[now.dow -1]);
96        display.print(now.day);
97        display.print(" ");
98        display.print(MonthText[now.month -1]);
99        
100        display.display();
101
102        
103        display.setTextColor(SSD1306_BLACK);
104        display.setCursor(17,22);
105        display.print(WeekDays[now.dow -1]);
106        display.print(now.day);
107        display.print(" ");
108        display.print(MonthText[now.month  -1]);           
109        
110                
111        
112        display.setTextSize(2);
113        display.setCursor(15,2);
114     if (now.hour <= 9) {
115        display.print("0");
116    }
117       display.print(now.hour);
118       display.print(":");
119     if  (now.minute <= 9) {
120       display.print("0");
121  }
122       display.print(now.minute);
123       display.print(":");
124     if (now.second <= 9) {
125       display.print("0");
126  } 
127      display.print(now.second);
128 
129// No need to display the screen  again
130 
131    }
132    LowPower.powerDown(SLEEP_250MS,ADC_OFF,BOD_OFF);
133}
134

#include <Arduino.h>
#include <Ds1302.h>
#include <LowPower.h>

  // DS1302 RTC instance
Ds1302 rtc(9,7,8); // RST , CLK , DAT

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

#define  SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 //  OLED display height

// Declaration for an SSD1306 display connected to I2C  (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 

#define  OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


const static  char* WeekDays[] =
{
    "Monday    ",
    "Tuesday   ",
    "Wednesday  ",
    "Thursday  ",
    "Friday    ",
    "Saturday  ",
    "Sunday    "
};
const static char* MonthText[] =
{
    "Jan",
    "Feb",
    "Mar",
    "Apr",
    "May",
    "Jun",
    "Jul",
    "Aug",
    "Sep",
    "Oct",
    "Nov",
    "Dec"
};


void  setup() {
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306  allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
   
    rtc.init(); // initialize the RTC
    display.clearDisplay();   //  clears the screen and buffer
    display.drawLine(12,18,112,18,WHITE);
    
}


void  loop()
{

    // get the current time
    Ds1302::DateTime now;
    rtc.getDateTime(&now);
    static uint8_t last_second = 0;
    if (last_second  != now.second)
    {
        last_second = now.second;
        display.setTextColor(SSD1306_WHITE);
        display.setTextSize(2);
        display.setCursor(15,2);
        if  (now.hour <= 9) { //If Hour is single figures, put a 0 in front
        display.print("0");
        }
        display.print(now.hour);
        display.print(":");
     if (now.minute <= 9) {  //If Minute is single figures, put a 0 in front
        display.print("0");
     }
        display.print(now.minute);
        display.print(":"); 
        if (now.second <= 9) {  //If Seconds is  single figures, put a 0 in front
        display.print("0");
     } 
        display.print(now.second);

        display.setTextSize(1);
        display.setCursor(17,22);
        display.print(WeekDays[now.dow -1]);
        display.print(now.day);
        display.print(" ");
        display.print(MonthText[now.month -1]);
        
        display.display();

        
        display.setTextColor(SSD1306_BLACK);
        display.setCursor(17,22);
        display.print(WeekDays[now.dow -1]);
        display.print(now.day);
        display.print(" ");
        display.print(MonthText[now.month  -1]);           
        
                
        
        display.setTextSize(2);
        display.setCursor(15,2);
     if (now.hour <= 9) {
        display.print("0");
    }
       display.print(now.hour);
       display.print(":");
     if  (now.minute <= 9) {
       display.print("0");
  }
       display.print(now.minute);
       display.print(":");
     if (now.second <= 9) {
       display.print("0");
  } 
      display.print(now.second);
 
// No need to display the screen  again
 
    }
    LowPower.powerDown(SLEEP_250MS,ADC_OFF,BOD_OFF);
}

Oled Clock on Nano

arduino

1
2#include <Arduino.h>
3#include <Ds1302.h>
4#include <LowPower.h>
5
6  // DS1302 RTC instance
7Ds1302 rtc(9,7,8); // RST , CLK , DAT
8
9#include  <SPI.h>
10#include <Wire.h>
11#include <Adafruit_GFX.h>
12#include <Adafruit_SSD1306.h>
13
14#define  SCREEN_WIDTH 128 // OLED display width, in pixels
15#define SCREEN_HEIGHT 32 //  OLED display height, in pixels
16
17// Declaration for an SSD1306 display connected  to I2C (SDA, SCL pins)
18// The pins for I2C are defined by the Wire-library. 
19
20#define  OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
21#define  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
22Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
23
24
25const static  char* WeekDays[] =
26{
27    "Monday    ",
28    "Tuesday   ",
29    "Wednesday  ",
30    "Thursday  ",
31    "Friday    ",
32    "Saturday  ",
33    "Sunday    "
34};
35
36
37void setup() {
38  if(!display.begin(SSD1306_SWITCHCAPVCC,  SCREEN_ADDRESS)) {
39    Serial.println(F("SSD1306 allocation failed"));
40    for(;;); // Don't proceed, loop forever
41  }
42   
43    rtc.init(); //  initialize the RTC
44    display.clearDisplay();   // clears the screen and buffer
45//    display.drawRect(0, 0, 84, 30, BLACK);
46//    display.drawRect(0, 29, 84,  12, BLACK);
47    
48}
49
50
51void loop()
52{
53
54    // get the current  time
55    Ds1302::DateTime now;
56    rtc.getDateTime(&now);
57    static uint8_t  last_second = 0;
58    if (last_second != now.second)
59    {
60        last_second  = now.second;
61        display.setTextColor(SSD1306_WHITE);
62        display.setTextSize(2);
63        display.setCursor(18,0);
64        if (now.hour <= 9) { //If Hour is single  figures, put a 0 in front
65        display.print("0");
66        }
67        display.print(now.hour);
68        display.print(":");
69     if (now.minute <= 9) {  //If Minute is single  figures, put a 0 in front
70        display.print("0");
71     }
72        display.print(now.minute);
73        display.print(":"); 
74        if (now.second <= 9) {  //If Seconds is  single figures, put a 0 in front
75        display.print("0");
76     } 
77        display.print(now.second);
78
79        display.setTextSize(1);
80        display.setCursor(27,20);
81        display.print(WeekDays[now.dow -1]);
82        display.print(now.day);
83        display.print("/");
84        display.print(now.month);
85        
86        display.display();
87
88        
89        display.setTextColor(SSD1306_BLACK);
90        display.setCursor(27,20);
91        display.print(WeekDays[now.dow -1]);
92        display.print(now.day);
93        display.print("/");
94        display.print(now.month);           
95        
96                
97        
98        display.setTextSize(2);
99        display.setCursor(18,0);
100     if (now.hour <= 9) {
101        display.print("0");
102    }
103       display.print(now.hour);
104       display.print(":");
105     if  (now.minute <= 9) {
106       display.print("0");
107  }
108       display.print(now.minute);
109       display.print(":");
110     if (now.second <= 9) {
111       display.print("0");
112  } 
113      display.print(now.second);
114 
115// No need to display the screen  again
116 
117    }
118    LowPower.powerDown(SLEEP_250MS,ADC_OFF,BOD_OFF);
119}
120

#include <Arduino.h>
#include <Ds1302.h>
#include <LowPower.h>

  // DS1302 RTC instance
Ds1302 rtc(9,7,8); // RST , CLK , DAT

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

#define  SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 //  OLED display height, in pixels

// Declaration for an SSD1306 display connected  to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 

#define  OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


const static  char* WeekDays[] =
{
    "Monday    ",
    "Tuesday   ",
    "Wednesday  ",
    "Thursday  ",
    "Friday    ",
    "Saturday  ",
    "Sunday    "
};


void setup() {
  if(!display.begin(SSD1306_SWITCHCAPVCC,  SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
   
    rtc.init(); //  initialize the RTC
    display.clearDisplay();   // clears the screen and buffer
//    display.drawRect(0, 0, 84, 30, BLACK);
//    display.drawRect(0, 29, 84,  12, BLACK);
    
}


void loop()
{

    // get the current  time
    Ds1302::DateTime now;
    rtc.getDateTime(&now);
    static uint8_t  last_second = 0;
    if (last_second != now.second)
    {
        last_second  = now.second;
        display.setTextColor(SSD1306_WHITE);
        display.setTextSize(2);
        display.setCursor(18,0);
        if (now.hour <= 9) { //If Hour is single  figures, put a 0 in front
        display.print("0");
        }
        display.print(now.hour);
        display.print(":");
     if (now.minute <= 9) {  //If Minute is single  figures, put a 0 in front
        display.print("0");
     }
        display.print(now.minute);
        display.print(":"); 
        if (now.second <= 9) {  //If Seconds is  single figures, put a 0 in front
        display.print("0");
     } 
        display.print(now.second);

        display.setTextSize(1);
        display.setCursor(27,20);
        display.print(WeekDays[now.dow -1]);
        display.print(now.day);
        display.print("/");
        display.print(now.month);
        
        display.display();

        
        display.setTextColor(SSD1306_BLACK);
        display.setCursor(27,20);
        display.print(WeekDays[now.dow -1]);
        display.print(now.day);
        display.print("/");
        display.print(now.month);           
        
                
        
        display.setTextSize(2);
        display.setCursor(18,0);
     if (now.hour <= 9) {
        display.print("0");
    }
       display.print(now.hour);
       display.print(":");
     if  (now.minute <= 9) {
       display.print("0");
  }
       display.print(now.minute);
       display.print(":");
     if (now.second <= 9) {
       display.print("0");
  } 
      display.print(now.second);
 
// No need to display the screen  again
 
    }
    LowPower.powerDown(SLEEP_250MS,ADC_OFF,BOD_OFF);
}

Tweaked Updated Display

arduino

1
2#include <Arduino.h>
3#include <Ds1302.h>
4#include <LowPower.h>
5
6
7  // DS1302 RTC instance
8Ds1302 rtc(9,7,8); // RST , CLK , DAT
9
10#include
11  <SPI.h>
12#include <Wire.h>
13#include <Adafruit_GFX.h>
14#include <Adafruit_SSD1306.h>
15
16#define
17  SCREEN_WIDTH 128 // OLED display width, in pixels
18#define SCREEN_HEIGHT 32 //
19  OLED display height
20
21// Declaration for an SSD1306 display connected to I2C
22  (SDA, SCL pins)
23// The pins for I2C are defined by the Wire-library. 
24
25#define
26  OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
27#define
28  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
29Adafruit_SSD1306
30  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
31
32
33const static
34  char* WeekDays[] =
35{
36    "Monday    ",
37    "Tuesday   ",
38    "Wednesday
39  ",
40    "Thursday  ",
41    "Friday    ",
42    "Saturday  ",
43    "Sunday
44    "
45};
46const static char* MonthText[] =
47{
48    "Jan",
49    "Feb",
50
51    "Mar",
52    "Apr",
53    "May",
54    "Jun",
55    "Jul",
56
57    "Aug",
58    "Sep",
59    "Oct",
60    "Nov",
61    "Dec"
62};
63
64
65void
66  setup() {
67  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
68    Serial.println(F("SSD1306
69  allocation failed"));
70    for(;;); // Don't proceed, loop forever
71  }
72
73   
74    rtc.init(); // initialize the RTC
75    display.clearDisplay();   //
76  clears the screen and buffer
77    display.drawLine(12,18,112,18,WHITE);
78    
79}
80
81
82void
83  loop()
84{
85
86    // get the current time
87    Ds1302::DateTime now;
88
89    rtc.getDateTime(&now);
90    static uint8_t last_second = 0;
91    if (last_second
92  != now.second)
93    {
94        last_second = now.second;
95        display.setTextColor(SSD1306_WHITE);
96
97        display.setTextSize(2);
98        display.setCursor(15,2);
99        if
100  (now.hour <= 9) { //If Hour is single figures, put a 0 in front
101        display.print("0");
102
103        }
104        display.print(now.hour);
105        display.print(":");
106
107     if (now.minute <= 9) {  //If Minute is single figures, put a 0 in front
108
109        display.print("0");
110     }
111        display.print(now.minute);
112
113        display.print(":"); 
114        if (now.second <= 9) {  //If Seconds is
115  single figures, put a 0 in front
116        display.print("0");
117     } 
118
119        display.print(now.second);
120
121        display.setTextSize(1);
122        display.setCursor(17,22);
123
124        display.print(WeekDays[now.dow -1]);
125        display.print(now.day);
126
127        display.print(" ");
128        display.print(MonthText[now.month -1]);
129
130        
131        display.display();
132
133        
134        display.setTextColor(SSD1306_BLACK);
135
136        display.setCursor(17,22);
137        display.print(WeekDays[now.dow -1]);
138
139        display.print(now.day);
140        display.print(" ");
141        display.print(MonthText[now.month
142  -1]);           
143        
144                
145        
146        display.setTextSize(2);
147
148        display.setCursor(15,2);
149     if (now.hour <= 9) {
150        display.print("0");
151
152    }
153       display.print(now.hour);
154       display.print(":");
155     if
156  (now.minute <= 9) {
157       display.print("0");
158  }
159       display.print(now.minute);
160
161       display.print(":");
162     if (now.second <= 9) {
163       display.print("0");
164
165  } 
166      display.print(now.second);
167 
168// No need to display the screen
169  again
170 
171    }
172    LowPower.powerDown(SLEEP_250MS,ADC_OFF,BOD_OFF);
173}
174

#include <Arduino.h>
#include <Ds1302.h>
#include <LowPower.h>


  // DS1302 RTC instance
Ds1302 rtc(9,7,8); // RST , CLK , DAT

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

#define
  SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 //
  OLED display height

// Declaration for an SSD1306 display connected to I2C
  (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 

#define
  OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define
  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306
  display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


const static
  char* WeekDays[] =
{
    "Monday    ",
    "Tuesday   ",
    "Wednesday
  ",
    "Thursday  ",
    "Friday    ",
    "Saturday  ",
    "Sunday
    "
};
const static char* MonthText[] =
{
    "Jan",
    "Feb",

    "Mar",
    "Apr",
    "May",
    "Jun",
    "Jul",

    "Aug",
    "Sep",
    "Oct",
    "Nov",
    "Dec"
};


void
  setup() {
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306
  allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

   
    rtc.init(); // initialize the RTC
    display.clearDisplay();   //
  clears the screen and buffer
    display.drawLine(12,18,112,18,WHITE);
    
}


void
  loop()
{

    // get the current time
    Ds1302::DateTime now;

    rtc.getDateTime(&now);
    static uint8_t last_second = 0;
    if (last_second
  != now.second)
    {
        last_second = now.second;
        display.setTextColor(SSD1306_WHITE);

        display.setTextSize(2);
        display.setCursor(15,2);
        if
  (now.hour <= 9) { //If Hour is single figures, put a 0 in front
        display.print("0");

        }
        display.print(now.hour);
        display.print(":");

     if (now.minute <= 9) {  //If Minute is single figures, put a 0 in front

        display.print("0");
     }
        display.print(now.minute);

        display.print(":"); 
        if (now.second <= 9) {  //If Seconds is
  single figures, put a 0 in front
        display.print("0");
     } 

        display.print(now.second);

        display.setTextSize(1);
        display.setCursor(17,22);

        display.print(WeekDays[now.dow -1]);
        display.print(now.day);

        display.print(" ");
        display.print(MonthText[now.month -1]);

        
        display.display();

        
        display.setTextColor(SSD1306_BLACK);

        display.setCursor(17,22);
        display.print(WeekDays[now.dow -1]);

        display.print(now.day);
        display.print(" ");
        display.print(MonthText[now.month
  -1]);           
        
                
        
        display.setTextSize(2);

        display.setCursor(15,2);
     if (now.hour <= 9) {
        display.print("0");

    }
       display.print(now.hour);
       display.print(":");
     if
  (now.minute <= 9) {
       display.print("0");
  }
       display.print(now.minute);

       display.print(":");
     if (now.second <= 9) {
       display.print("0");

  } 
      display.print(now.second);
 
// No need to display the screen
  again
 
    }
    LowPower.powerDown(SLEEP_250MS,ADC_OFF,BOD_OFF);
}

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Oled Clock

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