Md. Khairul Alam
Published © CC BY

DIY Arduino Dot Matrix Wrist Watch

My diy arduino dot matrix wrist watch shows time, date and temperature in two different form, BCD binary format and digital format.

Full instructions provided1,556
DIY Arduino Dot Matrix Wrist Watch

Things used in this project

Hardware components

ATMEGA328P SMD
×1
DS3231 RTC
×1
1.2 inch Dot-Matrix Display
×1
100R SMD Resistor
×8
10K SMD Resistor
×3
16 MHz Crystal
16 MHz Crystal
×1
Pushbutton switch 12mm
SparkFun Pushbutton switch 12mm
×2
Plastic Wrist Band
×1
Battery
×1

Story

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Code

Code snippet #1

Plain text
 #include "Wire.h"
 #define DS3231_I2C_ADDRESS 0x68
 
 #include <Button.h>          //https://github.com/JChristensen/Button

 #define BUTTON_PIN_1 2       //Connect a tactile button switch (or something similar)
 #define BUTTON_PIN_2 9       //from Arduino pin 2 to ground.
 #define PULLUP true          //To keep things simple, we use the Arduino's internal pullup resistor.
 #define INVERT true          //Since the pullup resistor will keep the pin high unless the
                              //switch is closed, this is negative logic, i.e. a high state
                              //means the button is NOT pressed. (Assuming a normally open switch.)
 #define DEBOUNCE_MS 20       //A debounce time of 20 milliseconds usually works well for tactile button switches.


 #define LONG_PRESS 1000      //We define a "long press" to be 1000 milliseconds.
 
 #define msec  1              //for brightness control of LED


 Button myBtn1(BUTTON_PIN_1, PULLUP, INVERT, DEBOUNCE_MS);    //Declare the button
 Button myBtn2(BUTTON_PIN_2, PULLUP, INVERT, DEBOUNCE_MS); 

// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
  return( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
  return( (val/16*10) + (val%16) );
}


byte second_unit, second_tens, minute_unit, minute_tens, hour_unit, hour_tens, 
     date_unit, date_tens, month_unit, month_tens, year_unit, year_tens, year_remain;
    
byte _second = 0, _minute = 10, _hour = 12, _day = 1, _date = 1, _month = 1, _year = 15;


long lastPressTime;

// you have to adjust pin number according to your connection 
byte colPin[8] = {4, 15, 14, 7, 12, 6, 3, 0}; //-ve pin
byte rowPin[8] = {8, 1, 10, 5, 17, 11, 16, 13}; //+ve


byte buttonStateOne = 0, buttonLongStateOne = 0, buttonStateTwo = 0, buttonLongStateTwo = 0;

byte clockMode = 0;



void setup() {
 Wire.begin();
  
 for (byte i = 3; i <= 17; i++) {
    if(i==9) continue;     //ignore pin 9 
    pinMode(i, OUTPUT);
  }
  
 pinMode(0, OUTPUT);
 pinMode(1, OUTPUT);
 pinMode(2, INPUT);       // button one
 pinMode(9, INPUT);       // button two
 digitalWrite(2, HIGH);   // enable internal pullup
 digitalWrite(9, HIGH);
   
    // set up cols and rows
 for (byte i = 1; i <= 8; i++) {
    digitalWrite(colPin[i - 1], HIGH);
  }

 for (byte i = 1; i <= 8; i++) {
    digitalWrite(rowPin[i - 1], LOW);
  }

}

void loop() {
    calculateDateTime();    
 if(buttonLongStateTwo == 0)   
    binaryClock();
 else
    editDisplay();
        
}

void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
  // sets time and date data to DS3231
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0); // set next input to start at the seconds register
  Wire.write(decToBcd(second)); // set seconds
  Wire.write(decToBcd(minute)); // set minutes
  Wire.write(decToBcd(hour | 0x40)); // set hours
  Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
  Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
  Wire.write(decToBcd(month)); // set month
  Wire.write(decToBcd(year)); // set year (0 to 99)
  Wire.endTransmission();
}

void readDS3231time(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0); // set DS3231 register pointer to 00h
  Wire.endTransmission();
  Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
  // request seven bytes of data from DS3231 starting from register 00h
  *second = bcdToDec(Wire.read() & 0x7f);
  *minute = bcdToDec(Wire.read());
  *hour = bcdToDec(Wire.read() & 0x1f);
  *dayOfWeek = bcdToDec(Wire.read());
  *dayOfMonth = bcdToDec(Wire.read());
  *month = bcdToDec(Wire.read());
  *year = bcdToDec(Wire.read());
}

void calculateDateTime(){
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
  // retrieve data from DS3231
  readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month,
  &year);
  
  if(hour > 12){
    hour = hour - 24;   
  }
  
  second_unit = second % 10;
  second_tens = second / 10;
  
  minute_unit = minute % 10;
  minute_tens = minute / 10;
  
  hour_unit = hour % 10;
  hour_tens = hour / 10;
  
  date_unit = dayOfMonth % 10;
  date_tens = dayOfMonth / 10;
  
  month_unit = month % 10;
  month_tens = month / 10;
  
  year_unit = year % 10;
  year_tens = year / 10;
}

void time_zero(int pos){
  delay(msec);  
}

void time_one(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[7], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[7], LOW);
}

void time_two(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[6], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[6], LOW);
}

void time_three(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[6], HIGH);
  digitalWrite(rowPin[7], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[6], LOW);
  digitalWrite(rowPin[7], LOW);
}

void time_four(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5], LOW);
}

void time_five(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5], HIGH);
  digitalWrite(rowPin[7], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5], LOW);
  digitalWrite(rowPin[7], LOW);
}

void time_six(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5], HIGH);
  digitalWrite(rowPin[6], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5], LOW);
  digitalWrite(rowPin[6], LOW);
}

void time_seven(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5], HIGH);
  digitalWrite(rowPin[6], HIGH);
  digitalWrite(rowPin[7], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5], LOW);
  digitalWrite(rowPin[6], LOW);
  digitalWrite(rowPin[7], LOW);
}

void time_eight(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[4], LOW);
}

void time_nine(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[4], HIGH);
  digitalWrite(rowPin[7], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[4], LOW);
  digitalWrite(rowPin[7], LOW);
}

void date_zero(int pos){
  delay(msec);  
}

void date_one(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[7-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[7-4], LOW);
}

void date_two(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[6-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[6-4], LOW);
}

void date_three(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[6-4], HIGH);
  digitalWrite(rowPin[7-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[6-4], LOW);
  digitalWrite(rowPin[7-4], LOW);
}

void date_four(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5-4], LOW);
}

void date_five(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5-4], HIGH);
  digitalWrite(rowPin[7-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5-4], LOW);
  digitalWrite(rowPin[7-4], LOW);
}

void date_six(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5-4], HIGH);
  digitalWrite(rowPin[6-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5-4], LOW);
  digitalWrite(rowPin[6-4], LOW);
}

void date_seven(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[5-4], HIGH);
  digitalWrite(rowPin[6-4], HIGH);
  digitalWrite(rowPin[7-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[5-4], LOW);
  digitalWrite(rowPin[6-4], LOW);
  digitalWrite(rowPin[7-4], LOW);
}

void date_eight(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[4-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[4-4], LOW);
}

void date_nine(int pos){
  digitalWrite(colPin[pos], LOW);
  digitalWrite(rowPin[4-4], HIGH);
  digitalWrite(rowPin[7-4], HIGH);
  delay(msec);
  digitalWrite(colPin[pos], HIGH);
  digitalWrite(rowPin[4-4], LOW);
  digitalWrite(rowPin[7-4], LOW);
}


void show(int digit, int pos){
  switch(digit){
     case 0:
     time_zero(pos);
     break;
     
     case 1:
     time_one(pos);
     break;
     
     case 2:
     time_two(pos);
     break;
     
     case 3:
     time_three(pos);
     break;
     
     case 4:
     time_four(pos);
     break;
     
     case 5:
     time_five(pos);
     break;
     
     case 6:
     time_six(pos);
     break;
     
     case 7:
     time_seven(pos);
     break;
     
     case 8:
     time_eight(pos);
     break;
     
     case 9:
     time_nine(pos);
     break;  
  }

}

void date_show(int digit, int pos){
  switch(digit){
     case 0:
     date_zero(pos);
     break;
     
     case 1:
     date_one(pos);
     break;
     
     case 2:
     date_two(pos);
     break;
     
     case 3:
     date_three(pos);
     break;
     
     case 4:
     date_four(pos);
     break;
     
     case 5:
     date_five(pos);
     break;
     
     case 6:
     date_six(pos);
     break;
     
     case 7:
     date_seven(pos);
     break;
     
     case 8:
     date_eight(pos);
     break;
     
     case 9:
     date_nine(pos);
     break;  
  }

}

void binaryClock(){
  FrequencyTimer2::setOnOverflow(0);
  show(second_unit, 7);
  show(second_tens, 6);
  
  show(minute_unit, 4);
  show(minute_tens, 3);
  
  show(hour_unit, 1);
  show(hour_tens, 0); 
 
  date_show(date_unit, 7);
  date_show(date_tens, 6);
 
  date_show(month_unit, 4);
  date_show(month_tens, 3);
 
  date_show(year_unit, 1);
  date_show(year_tens, 0); 
}

void showMinute(){
  int _minute_unit = _minute % 10;
  int _minute_tens = _minute / 10;
  show(_minute_unit, 4);
  show(_minute_tens, 3);
}

void showHour(){
  int _hour_unit = _hour % 10;
  int _hour_tens = _hour / 10;
  show(_hour_unit, 1);
  show(_hour_tens, 0); 
}
void showDate(){
  int _date_unit = _date % 10;
  int _date_tens = _date / 10;
  date_show(_date_unit, 7);
  date_show(_date_tens, 6);
}

void showMonth(){
  int _month_unit = _month % 10;
  int _month_tens = _month / 10;
  date_show(_month_unit, 4);
  date_show(_month_tens, 3);
}
void showYear(){
  int _year_unit = _year % 10;
  int _year_tens = _year / 10;
  date_show(_year_unit, 1);
  date_show(_year_tens, 0); 
}

 void button(){
    myBtn1.read();                //Read the button
    myBtn2.read();                //Read the button
                 
    if (myBtn1.wasReleased()){
         lastPressTime = millis();
         if(buttonLongStateTwo == 0){}
         else if((buttonLongStateTwo == 1) && (buttonStateTwo == 1))   
            {
              showMinute();
              _minute++;
              delay(20);
              if(_minute > 59)
              _minute = 0;
            //Serial.println(minute);
            }
         else if((buttonLongStateTwo == 1) && (buttonStateTwo == 2))   
           {
              showHour();
              _hour++;
              delay(20);
              if(_hour > 12)
              _hour = 1;
            //Serial.println(hour);
            }
         else if((buttonLongStateTwo == 1) && (buttonStateTwo == 3))   
            {
              showDate();
              _date++;
              delay(20);
              if(_date > 31)
              _date = 1;
            //Serial.println(date);
            }
         else if((buttonLongStateTwo == 1) && (buttonStateTwo == 4))   
            {
              showMonth();
              _month++;
              delay(20);
              if(_month > 12)
              _month = 1;
           // Serial.println(month);
            }
         else if((buttonLongStateTwo == 1) && (buttonStateTwo == 5))   
            {
              showYear();
              _year++;
              if(_year > 99)
              _year = 15;
              delay(20);
             //Serial.println(year);
            }
        
       }
         
    else if (myBtn1.pressedFor(LONG_PRESS)){
         lastPressTime = millis();
         setDS3231time(_second,_minute,_hour,1,_date,_month,_year);
         
         //Serial.println("date set");
         buttonLongStateTwo = 0;
         //Serial.println(buttonLongStateTwo);
         delay(100);
       }
         
   else if (myBtn2.wasReleased()){
        lastPressTime = millis();
        if(buttonLongStateTwo == 0){
         
          }
         else if(buttonLongStateTwo == 1){ 
            buttonStateTwo++;
            if(buttonStateTwo > 5)
             buttonStateTwo = 1;
         }
          if((buttonStateTwo == 1)&&(buttonLongStateTwo == 1)){
            showMinute();
            delay(20);
            //Serial.println("display minute");
            }
          if((buttonStateTwo == 2)&&(buttonLongStateTwo == 1)){
            //Serial.println("display hour");
            showHour();
            delay(20);
            }
          if((buttonStateTwo == 3)&&(buttonLongStateTwo == 1)){
            //Serial.println("dispaly date");
            showDate();
            delay(20);
          }
          if((buttonStateTwo == 4)&&(buttonLongStateTwo == 1)){
            //Serial.println("display month");
            showMonth();
            delay(20);
          }
          if((buttonStateTwo == 5)&&(buttonLongStateTwo == 1)){
            //Serial.println("display year");
            showYear(); 
            delay(20);   
          }
        
       }
    else if (myBtn2.pressedFor(LONG_PRESS)){
         lastPressTime = millis();
         readDS3231time(&_second, &_minute, &_hour, &_day, &_date, &_month,
     &_year);
         buttonLongStateTwo = 1;
         //Serial.println("editing mode");
         delay(10);
   }


}

void editDisplay(){
         if((buttonStateTwo == 1)&&(buttonLongStateTwo == 1)){
            showMinute();
            
            //Serial.println("display minute");
            }
        if((buttonStateTwo == 2)&&(buttonLongStateTwo == 1)){
            //Serial.println("display hour");
            showHour();
          
            }
        if((buttonStateTwo == 3)&&(buttonLongStateTwo == 1)){
            //Serial.println("dispaly date");
            showDate();
           
          }
        if((buttonStateTwo == 4)&&(buttonLongStateTwo == 1)){
           //Serial.println("display month");
            showMonth();
            
          }
        if((buttonStateTwo == 5)&&(buttonLongStateTwo == 1)){
            //Serial.println("display year");
            showYear(); 
          
          }
        
  }

Code snippet #2

Plain text
 #include <FrequencyTimer2.h>
 #include "Wire.h"
 #define DS3231_I2C_ADDRESS 0x68
 
 
// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
  return( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
  return( (val/16*10) + (val%16) );
}


byte second_unit, second_tens, minute_unit, minute_tens, hour_unit, hour_tens, 
    date_unit, date_tens, month_unit, month_tens, year_unit, year_tens, year_remain;
    
byte _second = 0, _minute = 10, _hour = 12, _day = 1, _date = 1, _month = 1, _year = 15;


byte tMSB, tLSB;
float temp3231;
long lastPressTime;

#define space { \
    {0, 0, 0, 0, 0, 0, 0, 0},  \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0} \
}

#define slash { \
    {0, 0, 0, 0, 0, 0, 0, 0},  \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 0, 0, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0} \
}

#define A { \
    {0, 0, 1, 1, 1, 0, 0, 0},  \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0} \
}

#define M { \
    {0, 1, 0, 0, 0, 1, 0, 0},  \
    {0, 1, 1, 0, 1, 1, 0, 0}, \
    {0, 1, 0, 1, 0, 1, 0, 0}, \
    {0, 1, 0, 1, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0} \
}

#define P { \
    {0, 1, 1, 1, 1, 0, 0, 0},  \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0} \
}

#define zero { \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 1, 1, 0, 0}, \
    {0, 1, 0, 1, 0, 1, 0, 0}, \
    {0, 1, 1, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define one { \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define two { \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 0, 0, 0, 0, 0}, \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define three { \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define four { \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 1, 1, 0, 0, 0}, \
    {0, 0, 1, 0, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 1, 0, 0, 0}, \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define five { \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define six { \
    {0, 0, 0, 1, 1, 0, 0, 0}, \
    {0, 0, 1, 0, 0, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define seven { \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 0, 0, 0, 0, 0}, \
    {0, 0, 1, 0, 0, 0, 0, 0}, \
    {0, 0, 1, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define eight { \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define nine { \
    {0, 0, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 1, 1, 1, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 1, 0, 0, 0}, \
    {0, 0, 1, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define colon { \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 1, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 1, 1, 0, 0, 0, 0}, \
    {0, 0, 1, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define DEGC { \
    {1, 1, 0, 0, 1, 1, 1, 0}, \
    {1, 1, 0, 1, 0, 0, 0, 1}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 1}, \
    {0, 0, 0, 0, 1, 1, 1, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define T { \
    {0, 1, 1, 1, 1, 1, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 1, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define smallm { \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 1, 0, 1, 0, 0, 0}, \
    {0, 1, 0, 1, 0, 1, 0, 0}, \
    {0, 1, 0, 1, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}

#define smallp { \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 1, 0, 0}, \
    {0, 1, 1, 1, 1, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 1, 0, 0, 0, 0, 0, 0}, \
    {0, 0, 0, 0, 0, 0, 0, 0}  \
}


byte col = 0;
byte leds[8][8];

byte rows[8] = {0, 3, 6, 12, 7, 14, 15, 4};
byte cols[8] = {8, 1, 10, 5, 17, 11, 16, 13};

const byte numPatterns = 14;
byte patterns[numPatterns][8][8] = {

  zero, one, two, three, four, five, six, seven, eight, nine, colon, space, slash, DEGC

};
int pattern = 0;


void setup() {
 Wire.begin();
 
 
 for (byte i = 3; i <= 17; i++) {
    if(i==9) continue;
    pinMode(i, OUTPUT);
  }
  
 pinMode(0, OUTPUT);
 pinMode(1, OUTPUT);
 

    // set up cols and rows
 for (byte i = 1; i <= 8; i++) {
    digitalWrite(rows[i - 1], LOW);
  }

 for (byte i = 1; i <= 8; i++) {
    digitalWrite(cols[i - 1], LOW);
  }

  clearLeds();


  // Turn off toggling of pin 11

  FrequencyTimer2::disable();

  // Set refresh rate (interrupt timeout period)

  FrequencyTimer2::setPeriod(2000);

  // Set interrupt routine to be called

  FrequencyTimer2::setOnOverflow(display);


  setPattern(pattern);

}

void loop() {
    calculateDateTime();
   
    
    digitalClock();
          
       
}

void clearLeds() {
  // Clear display array
  for (int i = 0; i < 8; i++) {
    for (int j = 0; j < 8; j++) {
      leds[i][j] = 0;
    }
  }
}


void setPattern(int pattern) {
  for (int i = 0; i < 8; i++) {
    for (int j = 0; j < 8; j++) {
      leds[i][j] = patterns[pattern][i][j];
    }
  }
}


void slidePattern(int pattern, int del) {
  for (int l = 0; l < 8; l++) {
    for (int i = 0; i < 7; i++) {
      for (int j = 0; j < 8; j++) {
        leds[j][i] = leds[j][i+1];
         }
    }
    for (int j = 0; j < 8; j++) {
      leds[j][7] = patterns[pattern][j][0 + l];
    }
    delay(del);
  }
}


// Interrupt routine

void display() {
  digitalWrite(cols[col], LOW);  // Turn whole previous column off
  col++;
  
  //digitalWrite(rows[row], LOW);  // Turn whole previous column off
  //row++;
  
  if (col == 8) {
    col = 0;
  }

  for (int row = 0; row < 8; row++) {
    if (leds[col][7 - row] == 1) {
      digitalWrite(rows[row], LOW);  // Turn on this led
    }
    else {
      digitalWrite(rows[row], HIGH); // Turn off this led
    }
  }
  digitalWrite(cols[col], HIGH); // Turn whole column on at once (for equal lighting times)
}


void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
  // sets time and date data to DS3231
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0); // set next input to start at the seconds register
  Wire.write(decToBcd(second)); // set seconds
  Wire.write(decToBcd(minute)); // set minutes
  Wire.write(decToBcd(hour | 0x40)); // set hours
  Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
  Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
  Wire.write(decToBcd(month)); // set month
  Wire.write(decToBcd(year)); // set year (0 to 99)
  Wire.endTransmission();
}

void readDS3231time(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0); // set DS3231 register pointer to 00h
  Wire.endTransmission();
  Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
  // request seven bytes of data from DS3231 starting from register 00h
  *second = bcdToDec(Wire.read() & 0x7f);
  *minute = bcdToDec(Wire.read());
  *hour = bcdToDec(Wire.read() & 0x1f);
  *dayOfWeek = bcdToDec(Wire.read());
  *dayOfMonth = bcdToDec(Wire.read());
  *month = bcdToDec(Wire.read());
  *year = bcdToDec(Wire.read());
}

void calculateDateTime(){
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
  // retrieve data from DS3231
  readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month,
  &year);
  
  if(hour > 12){
    hour = hour - 24;   
  }
  
  second_unit = second % 10;
  second_tens = second / 10;
  
  minute_unit = minute % 10;
  minute_tens = minute / 10;
  
  hour_unit = hour % 10;
  hour_tens = hour / 10;
  
  date_unit = dayOfMonth % 10;
  date_tens = dayOfMonth / 10;
  
  month_unit = month % 10;
  month_tens = month / 10;
  
  year_unit = year % 10;
  year_tens = year / 10;
}

void digitalClock(){
  FrequencyTimer2::setOnOverflow(display);
  slidePattern(hour_tens, 80);
  slidePattern(hour_unit, 80);
  slidePattern(10, 80);
  slidePattern(minute_tens, 80);
  slidePattern(minute_unit, 80);
  slidePattern(10, 80);
  slidePattern(second_tens, 80);
  slidePattern(second_unit, 80);
  //slidePattern(11, 80);
  slidePattern(11, 80);
  
  slidePattern(date_tens, 80);
  slidePattern(date_unit, 80);
  slidePattern(12, 80);
  slidePattern(month_tens, 80);
  slidePattern(month_unit, 80);
  slidePattern(12, 80);
  slidePattern(2, 80);
  slidePattern(0, 80);
  slidePattern(year_tens, 80);
  slidePattern(year_unit, 80);

  slidePattern(11, 80);
  int tempC = get3231Temp();
  int tempC_unit = tempC % 10;
  int tempC_tens = tempC / 10;
  
  slidePattern(tempC_tens, 80);
  slidePattern(tempC_unit, 80);
  slidePattern(13, 80);
  
  slidePattern(11, 80);
  slidePattern(11, 80);
}
    
int get3231Temp()
 {
  //temp registers (11h-12h) get updated automatically every 64s
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0x11);
  Wire.endTransmission();
  Wire.requestFrom(DS3231_I2C_ADDRESS, 2);
 
  if(Wire.available()) {
    tMSB = Wire.read(); //2's complement int portion
    tLSB = Wire.read(); //fraction portion
   
    temp3231 = (tMSB & B01111111); //do 2's math on Tmsb
    
  }
  else {
    //oh noes, no data!
  }
   
  return temp3231;
}

Code snippet #3

Plain text
#include 
#include 

void setup(){
// first parameter is interrupt number and 0 for INT0 pin
// second pin is the function to call after interrupt
attachInterrupt(0,wakeUpNow, LOW);

}

void sleepNow()         // here we put the arduino to sleep
{
      
    set_sleep_mode(SLEEP_MODE_PWR_DOWN);   // sleep mode is set here

    sleep_enable();              // enables the sleep bit in the mcucr register
                                 // so sleep is possible. just a safety pin 

    attachInterrupt(0,wakeUpNow, LOW); // use interrupt 0 (pin 2) and run function
                                       // wakeUpNow when pin 2 gets LOW 
                            
    sleep_mode();                // here the device is actually put to sleep!!
                                 // 


    sleep_disable();             // first thing after waking from sleep:
                                 // disable sleep...
    lastPressTime = millis();    // keep track how long the device is in active mode
    
    detachInterrupt(0);          // disables interrupt 0 on pin 2 so the 
                                 // wakeUpNow code will not be executed 
                                 // during normal running time.
                                 
}

void wakeUpNow()        // here the interrupt is handled after wakeup
{
  //execute code here after wake-up before returning to the loop() function
  // timers and code using timers (serial.print and more...) will not work here.
 
}

Github

https://github.com/JChristensen/Button

Credits

Md. Khairul Alam

Md. Khairul Alam

68 projects • 584 followers
Developer, Maker & Hardware Hacker. Currently working as a faculty at the University of Asia Pacific, Dhaka, Bangladesh.

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