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Led Matrix Clock using Arduino And RTC Module

Today iam going to show you how to make led matrix clock With Arduino & Rtc. this is a simple project does not require high knowledge

Jul 6, 2021

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4 respects

Components and supplies

Breadboard (generic)

Arduino Nano R3

Tactile Switch, Top Actuated

Female Header 8 Position 1 Row (0.1")

High Accuracy Pi RTC (DS3231)

Dot Pcb

Jumper wires (generic)

MAX7219 Led Matrix

Tools and machines

Desoldering Pump, Deluxe SOLDAPULLT®

PCB Holder, Soldering Iron

Solder Flux, Soldering

Solder Wire, Lead Free

Soldering iron (generic)

Apps and platforms

Arduino IDE

Project description

Code

Arduino Code

c9search

Upload The Code To Arduino Nano

1/*feel free to contact
2 * sreeramaj53@gmail.com
3 * www.youtube.com/ZenoModiff
4   * last updated - time 02:41 PM - date 06 july 2021
5 * Github Link :-- https://github.com/Zenomodiff/Max7219-Led-Matrix-Clock-With-DS3231-RTC-Module
6   */
7
8#include "DS3231.h"
9#include "Adafruit_GFX.h"
10#include "Max72xxPanel.h"
11
12DS3231   rtc(SDA, SCL);
13
14const byte LDR_PIN = A2;
15const byte CS_PIN = A3; 
16const   byte H_DISPLAYS = 4; 
17const byte V_DISPLAYS = 1; 
18
19Max72xxPanel matrix   = Max72xxPanel(CS_PIN, H_DISPLAYS, V_DISPLAYS);
20
21const byte WAIT = 30;
22const   byte SPACER = 1;
23const byte FONT_WIDTH = 5 + SPACER; 
24
25void setup() {
26   pinMode(LDR_PIN, INPUT_PULLUP);
27  Serial.begin(9600);
28  Serial.println(F(">>   Arduino 32x8 LED Dot Matrix Clock!"));
29  Serial.println(F(">> Use <dd/mm/yyyy   hh:mm:ss> format to set clock's date and hour!"));
30  rtc.begin();
31  matrix.setPosition(0,   0, 0);
32  matrix.setPosition(1, 1, 0);
33  matrix.setPosition(2, 2, 0);
34  matrix.setPosition(3,   3, 0);
35  matrix.setRotation(0, 1);    
36  matrix.setRotation(1, 1);
37  matrix.setRotation(2,   1);
38  matrix.setRotation(3, 1);
39}
40
41void loop() {
42  byte ledIntensity   = ledIntensitySelect(analogRead(LDR_PIN));
43  matrix.setIntensity(ledIntensity);   
44  String output = outputStrClock();
45  
46  for ( int i = 0 ; i < FONT_WIDTH   * output.length() + matrix.width() - 1 - SPACER; i++ ) {
47    matrix.fillScreen(LOW);
48     output = outputStrClock();
49    int letter = i / FONT_WIDTH;
50    int x   = (matrix.width() - 1) - i % FONT_WIDTH;
51    int y = (matrix.height() - 8) /   2; 
52    while ( x + FONT_WIDTH - SPACER >= 0 && letter >= 0 ) {
53      if (   letter < output.length() ) {
54        matrix.drawChar(x, y, output[letter], HIGH,   LOW, 1);
55      }
56      letter--;
57      x -= FONT_WIDTH;
58    }
59    matrix.write();
60     delay(WAIT);
61  }
62
63  if (Serial.available() > 0) {
64    adjustClock(Serial.readString());
65   }
66}
67
68void adjustClock(String data) {
69  byte _day = data.substring(0,2).toInt();
70   byte _month = data.substring(3,5).toInt();
71  int _year = data.substring(6,10).toInt();
72   byte _hour = data.substring(11,13).toInt();
73  byte _min = data.substring(14,16).toInt();
74   byte _sec = data.substring(17,19).toInt();
75  rtc.setTime(_hour, _min, _sec);
76   rtc.setDate(_day, _month, _year);
77  Serial.println(F(">> Datetime successfully   set!"));
78}
79
80String outputStrClock() {
81  String _output;
82  _output   = rtc.getDateStr();
83  _output.concat("  ");
84  _output.concat(rtc.getTimeStr());
85   _output.concat("  ");
86  _output.concat(rtc.getTemp());
87  _output.concat((char)247);
88   _output.concat("C");
89  return _output;
90}
91
92byte ledIntensitySelect(int   light) {
93  byte _value = 0;
94  if (light >= 0 && light <= 127) {
95    _value   = 15;
96  } else if (light >= 128 && light <= 319) {
97    _value = 10; 
98  }   else if (light >= 320 && light <= 512) {
99    _value = 5;
100  }
101  return _value;
102};
103

/*feel free to contact
 * sreeramaj53@gmail.com
 * www.youtube.com/ZenoModiff
   * last updated - time 02:41 PM - date 06 july 2021
 * Github Link :-- https://github.com/Zenomodiff/Max7219-Led-Matrix-Clock-With-DS3231-RTC-Module
   */

#include "DS3231.h"
#include "Adafruit_GFX.h"
#include "Max72xxPanel.h"

DS3231   rtc(SDA, SCL);

const byte LDR_PIN = A2;
const byte CS_PIN = A3; 
const   byte H_DISPLAYS = 4; 
const byte V_DISPLAYS = 1; 

Max72xxPanel matrix   = Max72xxPanel(CS_PIN, H_DISPLAYS, V_DISPLAYS);

const byte WAIT = 30;
const   byte SPACER = 1;
const byte FONT_WIDTH = 5 + SPACER; 

void setup() {
   pinMode(LDR_PIN, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.println(F(">>   Arduino 32x8 LED Dot Matrix Clock!"));
  Serial.println(F(">> Use <dd/mm/yyyy   hh:mm:ss> format to set clock's date and hour!"));
  rtc.begin();
  matrix.setPosition(0,   0, 0);
  matrix.setPosition(1, 1, 0);
  matrix.setPosition(2, 2, 0);
  matrix.setPosition(3,   3, 0);
  matrix.setRotation(0, 1);    
  matrix.setRotation(1, 1);
  matrix.setRotation(2,   1);
  matrix.setRotation(3, 1);
}

void loop() {
  byte ledIntensity   = ledIntensitySelect(analogRead(LDR_PIN));
  matrix.setIntensity(ledIntensity);   
  String output = outputStrClock();
  
  for ( int i = 0 ; i < FONT_WIDTH   * output.length() + matrix.width() - 1 - SPACER; i++ ) {
    matrix.fillScreen(LOW);
     output = outputStrClock();
    int letter = i / FONT_WIDTH;
    int x   = (matrix.width() - 1) - i % FONT_WIDTH;
    int y = (matrix.height() - 8) /   2; 
    while ( x + FONT_WIDTH - SPACER >= 0 && letter >= 0 ) {
      if (   letter < output.length() ) {
        matrix.drawChar(x, y, output[letter], HIGH,   LOW, 1);
      }
      letter--;
      x -= FONT_WIDTH;
    }
    matrix.write();
     delay(WAIT);
  }

  if (Serial.available() > 0) {
    adjustClock(Serial.readString());
   }
}

void adjustClock(String data) {
  byte _day = data.substring(0,2).toInt();
   byte _month = data.substring(3,5).toInt();
  int _year = data.substring(6,10).toInt();
   byte _hour = data.substring(11,13).toInt();
  byte _min = data.substring(14,16).toInt();
   byte _sec = data.substring(17,19).toInt();
  rtc.setTime(_hour, _min, _sec);
   rtc.setDate(_day, _month, _year);
  Serial.println(F(">> Datetime successfully   set!"));
}

String outputStrClock() {
  String _output;
  _output   = rtc.getDateStr();
  _output.concat("  ");
  _output.concat(rtc.getTimeStr());
   _output.concat("  ");
  _output.concat(rtc.getTemp());
  _output.concat((char)247);
   _output.concat("C");
  return _output;
}

byte ledIntensitySelect(int   light) {
  byte _value = 0;
  if (light >= 0 && light <= 127) {
    _value   = 15;
  } else if (light >= 128 && light <= 319) {
    _value = 10; 
  }   else if (light >= 320 && light <= 512) {
    _value = 5;
  }
  return _value;
};

Arduino Code

c9search

Upload The Code To Arduino Nano

1/*feel free to contact
2 * sreeramaj53@gmail.com
3 * www.youtube.com/ZenoModiff
4  * last updated - time 02:41 PM - date 06 july 2021
5 * Github Link :-- https://github.com/Zenomodiff/Max7219-Led-Matrix-Clock-With-DS3231-RTC-Module
6  */
7
8#include "DS3231.h"
9#include "Adafruit_GFX.h"
10#include "Max72xxPanel.h"
11
12DS3231  rtc(SDA, SCL);
13
14const byte LDR_PIN = A2;
15const byte CS_PIN = A3; 
16const  byte H_DISPLAYS = 4; 
17const byte V_DISPLAYS = 1; 
18
19Max72xxPanel matrix  = Max72xxPanel(CS_PIN, H_DISPLAYS, V_DISPLAYS);
20
21const byte WAIT = 30;
22const  byte SPACER = 1;
23const byte FONT_WIDTH = 5 + SPACER; 
24
25void setup() {
26  pinMode(LDR_PIN, INPUT_PULLUP);
27  Serial.begin(9600);
28  Serial.println(F(">>  Arduino 32x8 LED Dot Matrix Clock!"));
29  Serial.println(F(">> Use <dd/mm/yyyy  hh:mm:ss> format to set clock's date and hour!"));
30  rtc.begin();
31  matrix.setPosition(0,  0, 0);
32  matrix.setPosition(1, 1, 0);
33  matrix.setPosition(2, 2, 0);
34  matrix.setPosition(3,  3, 0);
35  matrix.setRotation(0, 1);    
36  matrix.setRotation(1, 1);
37  matrix.setRotation(2,  1);
38  matrix.setRotation(3, 1);
39}
40
41void loop() {
42  byte ledIntensity  = ledIntensitySelect(analogRead(LDR_PIN));
43  matrix.setIntensity(ledIntensity);  
44  String output = outputStrClock();
45  
46  for ( int i = 0 ; i < FONT_WIDTH  * output.length() + matrix.width() - 1 - SPACER; i++ ) {
47    matrix.fillScreen(LOW);
48    output = outputStrClock();
49    int letter = i / FONT_WIDTH;
50    int x  = (matrix.width() - 1) - i % FONT_WIDTH;
51    int y = (matrix.height() - 8) /  2; 
52    while ( x + FONT_WIDTH - SPACER >= 0 && letter >= 0 ) {
53      if (  letter < output.length() ) {
54        matrix.drawChar(x, y, output[letter], HIGH,  LOW, 1);
55      }
56      letter--;
57      x -= FONT_WIDTH;
58    }
59    matrix.write();
60    delay(WAIT);
61  }
62
63  if (Serial.available() > 0) {
64    adjustClock(Serial.readString());
65  }
66}
67
68void adjustClock(String data) {
69  byte _day = data.substring(0,2).toInt();
70  byte _month = data.substring(3,5).toInt();
71  int _year = data.substring(6,10).toInt();
72  byte _hour = data.substring(11,13).toInt();
73  byte _min = data.substring(14,16).toInt();
74  byte _sec = data.substring(17,19).toInt();
75  rtc.setTime(_hour, _min, _sec);
76  rtc.setDate(_day, _month, _year);
77  Serial.println(F(">> Datetime successfully  set!"));
78}
79
80String outputStrClock() {
81  String _output;
82  _output  = rtc.getDateStr();
83  _output.concat("  ");
84  _output.concat(rtc.getTimeStr());
85  _output.concat("  ");
86  _output.concat(rtc.getTemp());
87  _output.concat((char)247);
88  _output.concat("C");
89  return _output;
90}
91
92byte ledIntensitySelect(int  light) {
93  byte _value = 0;
94  if (light >= 0 && light <= 127) {
95    _value  = 15;
96  } else if (light >= 128 && light <= 319) {
97    _value = 10; 
98  }  else if (light >= 320 && light <= 512) {
99    _value = 5;
100  }
101  return _value;
102};
103

/*feel free to contact
 * sreeramaj53@gmail.com
 * www.youtube.com/ZenoModiff
  * last updated - time 02:41 PM - date 06 july 2021
 * Github Link :-- https://github.com/Zenomodiff/Max7219-Led-Matrix-Clock-With-DS3231-RTC-Module
  */

#include "DS3231.h"
#include "Adafruit_GFX.h"
#include "Max72xxPanel.h"

DS3231  rtc(SDA, SCL);

const byte LDR_PIN = A2;
const byte CS_PIN = A3; 
const  byte H_DISPLAYS = 4; 
const byte V_DISPLAYS = 1; 

Max72xxPanel matrix  = Max72xxPanel(CS_PIN, H_DISPLAYS, V_DISPLAYS);

const byte WAIT = 30;
const  byte SPACER = 1;
const byte FONT_WIDTH = 5 + SPACER; 

void setup() {
  pinMode(LDR_PIN, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.println(F(">>  Arduino 32x8 LED Dot Matrix Clock!"));
  Serial.println(F(">> Use <dd/mm/yyyy  hh:mm:ss> format to set clock's date and hour!"));
  rtc.begin();
  matrix.setPosition(0,  0, 0);
  matrix.setPosition(1, 1, 0);
  matrix.setPosition(2, 2, 0);
  matrix.setPosition(3,  3, 0);
  matrix.setRotation(0, 1);    
  matrix.setRotation(1, 1);
  matrix.setRotation(2,  1);
  matrix.setRotation(3, 1);
}

void loop() {
  byte ledIntensity  = ledIntensitySelect(analogRead(LDR_PIN));
  matrix.setIntensity(ledIntensity);  
  String output = outputStrClock();
  
  for ( int i = 0 ; i < FONT_WIDTH  * output.length() + matrix.width() - 1 - SPACER; i++ ) {
    matrix.fillScreen(LOW);
    output = outputStrClock();
    int letter = i / FONT_WIDTH;
    int x  = (matrix.width() - 1) - i % FONT_WIDTH;
    int y = (matrix.height() - 8) /  2; 
    while ( x + FONT_WIDTH - SPACER >= 0 && letter >= 0 ) {
      if (  letter < output.length() ) {
        matrix.drawChar(x, y, output[letter], HIGH,  LOW, 1);
      }
      letter--;
      x -= FONT_WIDTH;
    }
    matrix.write();
    delay(WAIT);
  }

  if (Serial.available() > 0) {
    adjustClock(Serial.readString());
  }
}

void adjustClock(String data) {
  byte _day = data.substring(0,2).toInt();
  byte _month = data.substring(3,5).toInt();
  int _year = data.substring(6,10).toInt();
  byte _hour = data.substring(11,13).toInt();
  byte _min = data.substring(14,16).toInt();
  byte _sec = data.substring(17,19).toInt();
  rtc.setTime(_hour, _min, _sec);
  rtc.setDate(_day, _month, _year);
  Serial.println(F(">> Datetime successfully  set!"));
}

String outputStrClock() {
  String _output;
  _output  = rtc.getDateStr();
  _output.concat("  ");
  _output.concat(rtc.getTimeStr());
  _output.concat("  ");
  _output.concat(rtc.getTemp());
  _output.concat((char)247);
  _output.concat("C");
  return _output;
}

byte ledIntensitySelect(int  light) {
  byte _value = 0;
  if (light >= 0 && light <= 127) {
    _value  = 15;
  } else if (light >= 128 && light <= 319) {
    _value = 10; 
  }  else if (light >= 320 && light <= 512) {
    _value = 5;
  }
  return _value;
};

Downloadable files

Schematics

Solder The PCB According To The Schematics

Schematics

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