Published May 20, 2023 © GPL3+

Chiming Digital Clock

A chiming digital clock using an Arduino Nano with the ST7735S colour display. Using the DS3231 RTC and a DFPlayer Mini

IntermediateFull instructions provided2 hours269

Things used in this project

Hardware components

ST7735S SPI 0.96in Display

DS3231 RTC

Arduino Nano

Software apps and online services

Arduino IDE

Story

This is a combination of projects that I have developed. The ST7735S digital clock and the chiming clock. I have used The ST7735S 80x160 SPI colour display and timekeeper DS3231. The Chimes are played each hour on a DFPlayer Mini and a passive speaker, actual Big Ben chimes between 6am and 10pm and a cuckoo sound on the hour at all other times.

The power supply is a standard 5v breadboard type connected to the input pin of the Nano.

The ST7735S display is 3.3v so don't forget to use 220 ohm resistors on the SPI input pins.. SCL, SDA, RES, DC, and CS also 3.3v on VCC.

Schematics

Code

ST7735_Chiming _Clock_Code

/*  **************************************************************************
*    Digital Clock Project using ST7735 80 x 160 (RGB) .96 inch IPS Display
*    With an Arduino Nano and a DS3231 RTC
*    
*    Pin Used With The Arduino Nano :
*    A5 SCL RTC
*    A4 SDA RTC
*    
*    D5 RST  ST7735
*    D6 CS
*    D7 DC
*    D13 SCL/SCK *These markings are confusing*
*    D11 MOSI/SDA
*    
     **************************************************************************
*/




 
   #include <Adafruit_GFX.h>
   #include <Adafruit_ST7735.h>
   #include <DFRobotDFPlayerMini.h>
   #include <SPI.h>
   #include <DS3231.h>      //https://github.com/NorthernWidget/DS3231/releases
   #include <Wire.h>

   #define TFT_RST  5
   #define TFT_CS   6
   #define TFT_DC   7
  
   Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
   DFRobotDFPlayerMini myDFPlayer;
   DS3231 myRTC;
   
// inverted color definitions
   #define BLACK   0xFFFF
   #define WHITE   0x0000
   #define BLUE    0x07FF
   #define RED     0xFFE0 
   #define GREEN   0xF81F
   #define YELLOW  0xF800 
   #define BROWN   0x9F6D
   #define L_BLUE  0x51E4

byte L_Hour = 18;   // Last Hour
byte L_Min = 43;    // Last Minute
byte L_Sec = 10;    // Last Second
byte L_Dow = 6;     // Last Day Of The Week
byte L_Date = 11;   // Last Date
byte L_Month = 11;  // Last Month
byte L_Temp = 28;   // Last Temperature
byte L_Year;        // Last Year
byte YEAR = 20;     // Year 2000
byte YEAR_2;        // Last 2 digits of the year

byte Sec,Min,HOUR,Hour2,Dow,Date,MONTH,Temp;    // Variables from RTC
bool h12Flag,pmFlag;                      //Unused 12h pm Flags
bool century = false;

String DAYS_OF_WEEK [] {"Dummy","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};

void setup () {
   Serial.begin(9600);
   myDFPlayer.begin(Serial);
   tft.initR (INITR_BLACKTAB);
   Wire.begin();
   tft.setRotation (3);    // Display Lasdscape
   tft.fillScreen (BLACK);
   LinesDraw();            // Draw Lines Routine
   MONTH = myRTC.getMonth(century);
   if (century) {         // Year 2100
    YEAR = 21; 
   }
   YEAR_2 = myRTC.getYear();
   L_Year = YEAR_2;    
   TextDraw();            // Display All Screen Text
   tft.setTextSize(3);    // Time Text Size


   
}

void loop (){

Sec = myRTC.getSecond();
if (Sec != L_Sec) {
  Sec_Print();
}  
  Min = myRTC.getMinute();
  if (Min != L_Min) {
   Min_Print();
}
  HOUR = myRTC.getHour(h12Flag, pmFlag);
  if (HOUR != L_Hour) {
  Hour_Print();
}
  Dow = myRTC.getDoW();
  if (L_Dow != Dow) {
  tft.setTextSize(2);
  Dow_Print();
  tft.setTextSize(3);  
}
   
  
 

Date = myRTC.getDate();
if (L_Date != Date) {
  tft.setTextSize(2);
  Date_Print();


MONTH = myRTC.getMonth(century);
if (L_Month != MONTH) {
  Month_Print();

  YEAR_2 = myRTC.getYear();
  if (YEAR_2 != L_Year) {
    if (century) {
      YEAR = 21;
    }
    Year_Print();
    
  }
 }
   tft.setTextSize(3);
}

Temp = myRTC.getTemperature();
if (L_Temp != Temp) {
  tft.setTextSize(2);
  Temp_Print();
  tft.setTextSize(3);
 }
    if ((Min == 59) && (Sec == 40)) {
    Hour2 = HOUR +1;
    chime();
   }
}

void LinesDraw() {    //Draw The Screen Borders

  tft.drawLine(3,54,157,54,RED);
  tft.drawLine(3,55,157,55,RED);
  tft.drawLine(3,80,157,80,RED);
  tft.drawLine(3,81,157,81,RED);
  tft.drawLine(112,56,112,79,RED);
  tft.drawLine(113,56,113,79,RED);
 
  tft.drawRect(1,26,159,80,RED);
  tft.drawRect(2,27,157,78,RED);

  tft.fillRect(114,55,44,25,BROWN);  // Temperature Box
}
 void TextDraw() {     //Set up Startup Screen
     tft.setTextSize(3);
     tft.setTextColor(WHITE);
     tft.setCursor(10,30);
     tft.print(L_Hour);
     tft.print(":");
     tft.print(L_Min);
     tft.print(":");
     tft.print(L_Sec);

     tft.setTextSize(2);
     tft.setTextColor(GREEN);
     tft.setCursor(4 +((108-(DAYS_OF_WEEK [L_Dow].length())*12)/2),60);
     tft.print(DAYS_OF_WEEK [L_Dow]);
     
     tft.setTextColor(L_BLUE);
     tft.setCursor(20,86);
     tft.print("11/11/");
     tft.print(YEAR);
     tft.print(L_Year);
     
     tft.setTextColor(YELLOW);
     tft.setCursor(120,60);
     tft.print("28c");
 }

 void Sec_Print () {      // Print Seconds
  tft.setTextColor(BLACK);
  tft.setCursor(118,30);
  if (L_Sec < 10) {
    tft.print("0");
  }
  tft.print(L_Sec);
  L_Sec = Sec;
  tft.setTextColor(WHITE);
  tft.setCursor(118,30);
  if (L_Sec < 10) {
    tft.print("0");
  }
  tft.print(L_Sec);
 }

 void Min_Print () {    // Print Minutes
  tft.setTextColor(BLACK);
  tft.setCursor(64,30);
  if (L_Min < 10) {
    tft.print("0");
  }
  tft.print(L_Min);
  L_Min = Min;
  tft.setTextColor(WHITE);
  tft.setCursor(64,30);
  if (L_Min < 10) {
    tft.print("0");
  }
  tft.print(L_Min);
 }

 void Hour_Print () {   // Print Hours
  tft.setTextColor(BLACK);
  tft.setCursor(10,30);
  if (L_Hour < 10) {
    tft.print("0");
  }
  tft.print(L_Hour);
  L_Hour = HOUR;
  tft.setTextColor(WHITE);
  tft.setCursor(10,30);
  if (L_Hour < 10) {
    tft.print("0");
  }
  tft.print(L_Hour);
 }

 void Dow_Print() {     // Print Days Of The Week String
  tft.setTextColor(BLACK);
  tft.setCursor(4 +((108-(DAYS_OF_WEEK [L_Dow].length())*12)/2),60);
  tft.print(DAYS_OF_WEEK [L_Dow]);
  L_Dow = Dow;
  tft.setTextColor(GREEN);
  tft.setCursor(4 +((108-(DAYS_OF_WEEK [L_Dow].length())*12)/2),60); 
  tft.print(DAYS_OF_WEEK[L_Dow]);
 }

void Date_Print() {     // Print Date
  tft.setTextColor(BLACK);
  tft.setCursor(20,86);
  if (L_Date < 10) {
    tft.print("0");
  }
  tft.print(L_Date);
  L_Date = Date;
  tft.setTextColor(L_BLUE);
  tft.setCursor(20,86);
  if (L_Date < 10) {
    tft.print("0");
  }  
  tft.print(L_Date);
}

void Month_Print(){     // Print Month
  // 56x  86y
  tft.setTextColor(BLACK);
  tft.setCursor(56,86);
  if (L_Month < 10) {
    tft.print("0");
  }
  tft.print(L_Month);
  L_Month = MONTH;
  tft.setTextColor(L_BLUE);
  tft.setCursor(56,86);
  if (L_Month < 10) {
    tft.print("0");
  }  
  tft.print(L_Month);
}

void Temp_Print() {     // Print Temperature
  tft.setTextColor(BROWN);
  tft.setCursor(120,60);
  if (L_Temp < 10) {
    tft.print("0");
  }
  tft.print(L_Temp);
  L_Temp = Temp;
  tft.setTextColor(YELLOW);
  tft.setCursor(120,60);
  if (L_Temp < 10) {
    tft.print("0");
  }
  tft.print(L_Temp);
}

void Year_Print() {       // Print the Year
  tft.setTextColor(BLACK);
  tft.setCursor(91,86);
  tft.print(YEAR);
  tft.print(L_Year);
  tft.setTextColor(L_BLUE);
  tft.setCursor(91,86);
  tft.print(YEAR);
  L_Year = YEAR_2;
  tft.print(L_Year);
}

 void chime() {
  myDFPlayer.volume(15);  
  switch (Hour2) {
    case 6:
    myDFPlayer.play(6);
    break;
    case 7:
    myDFPlayer.play(7);
    break;
    case 8:
    myDFPlayer.play(8);
    break;
    case 9:
    myDFPlayer.play(9);
    break;
    case 10:
    myDFPlayer.play(10);
    break;
    case 11:
    myDFPlayer.play(11);
    break;
    case 12:
    myDFPlayer.play(12);
    break;
    case 13:
    myDFPlayer.play(1);
    break;
    case 14:
    myDFPlayer.play(2);
    break;
    case 15:
    myDFPlayer.play(3);
    break;
    case 16:
    myDFPlayer.play(4);
    break;
    case 17:
    myDFPlayer.play(5);
    break;
    case 18:
    myDFPlayer.play(6);
    break;
    case 19:
    myDFPlayer.play(7);
    break;
    case 20:
    myDFPlayer.play(8);
    break;
    case 21:
    myDFPlayer.play(9);
    break;
    case 22:
    myDFPlayer.play(22);
    break;
    case 23:
    myDFPlayer.play(23);
    break;
    case 24:
    myDFPlayer.play(24);
    break;
    case 1:
    myDFPlayer.play(13);
    break;
    case 2:
    myDFPlayer.play(14);
    break;
    case 3:
    myDFPlayer.play(15);
    break;     
    case 4:
    myDFPlayer.play(16);
    break;     
    case 5:
    myDFPlayer.play(17);
    break;    
  }    
  }

Credits

stevie135s

21 projects • 10 followers

Chiming Digital Clock

Things used in this project

Hardware components

Software apps and online services

Story

Custom parts and enclosures

Chiming mp3's

Schematics

ST7735S_Circuit

Code

ST7735_Chiming _Clock_Code

Credits

stevie135s

Comments

Embed the widget on your own site

Chiming Digital Clock

Chiming Digital Clock

Things used in this project

Hardware components

Software apps and online services

Story

Custom parts and enclosures

Chiming mp3's

Schematics

ST7735S_Circuit

Code

ST7735_Chiming _Clock_Code

Credits

stevie135s

Comments

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