Creating clock with custom built 7 segment display - Part1

Cool looking clock where leds lighting individual segments are controlled by MAX7219 module

Aug 20, 2021

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clock

max7219

7 segments

Components and supplies

Arduino Nano R3

Wide Angle LED

MAX7219 Module

Custom PCB

Apps and platforms

Arduino IDE 2.0 (beta)

Project description

Code

Code to fast count from 0 to 9999 on custom built 7 segment display

arduino

1#include "LedControl.h"
2LedControl lc=LedControl(11,13,12,1);
3int   RowBits; 
4int d1;
5int d2;
6int d3;
7int d4;
8
9
10void setup() {
11   lc.shutdown(0,false);
12  lc.setIntensity(0,4);
13  lc.clearDisplay(0);
14   Serial.begin(9600);
15}
16
17void loop() {
18 
19
20  for (int i=0;i<10000;i++){
21     d1=(int)i/1000;
22    d2=((int)i/100*100-(int)i/1000*1000)/100;
23    d3=((int)i/10*10-(int)i/100*100)/10;
24     d4=i-(int)i/10*10;
25    lc.setChar(0,0,d1,false);
26    lc.setChar(0,1,d2,false);
27     lc.setChar(0,2,d3,false);
28    lc.setChar(0,3,d4,false);
29    Serial.print(d1);
30     Serial.print(d2);
31    Serial.print(d3);
32    Serial.println(d4);
33    
34     delay(20);
35  }
36 }

#include "LedControl.h"
LedControl lc=LedControl(11,13,12,1);
int   RowBits; 
int d1;
int d2;
int d3;
int d4;


void setup() {
   lc.shutdown(0,false);
  lc.setIntensity(0,4);
  lc.clearDisplay(0);
   Serial.begin(9600);
}

void loop() {
 

  for (int i=0;i<10000;i++){
     d1=(int)i/1000;
    d2=((int)i/100*100-(int)i/1000*1000)/100;
    d3=((int)i/10*10-(int)i/100*100)/10;
     d4=i-(int)i/10*10;
    lc.setChar(0,0,d1,false);
    lc.setChar(0,1,d2,false);
     lc.setChar(0,2,d3,false);
    lc.setChar(0,3,d4,false);
    Serial.print(d1);
     Serial.print(d2);
    Serial.print(d3);
    Serial.println(d4);
    
     delay(20);
  }
 }

Code to light all 30 leds of the custom seven segment display, one by one

arduino

1#include "LedControl.h"
2LedControl lc=LedControl(11,13,12,1);
3int  RowBits; 
4
5void setup() {
6  lc.shutdown(0,false);
7  lc.setIntensity(0,10);
8  lc.clearDisplay(0);
9}
10
11void loop() {
12   for (int i=0;i<4;i++){
13     RowBits=B10000000; 
14     for (int j=0;j<9;j++){
15       lc.setRow(0,0,  RowBits); 
16       RowBits = RowBits >>1;
17       delay(150);
18     } 
19   }
20 }
21

#include "LedControl.h"
LedControl lc=LedControl(11,13,12,1);
int  RowBits; 

void setup() {
  lc.shutdown(0,false);
  lc.setIntensity(0,10);
  lc.clearDisplay(0);
}

void loop() {
   for (int i=0;i<4;i++){
     RowBits=B10000000; 
     for (int j=0;j<9;j++){
       lc.setRow(0,0,  RowBits); 
       RowBits = RowBits >>1;
       delay(150);
     } 
   }
 }

Code to fast count from 0 to 9999 on custom built 7 segment display

arduino

1#include "LedControl.h"
2LedControl lc=LedControl(11,13,12,1);
3int  RowBits; 
4int d1;
5int d2;
6int d3;
7int d4;
8
9
10void setup() {
11  lc.shutdown(0,false);
12  lc.setIntensity(0,4);
13  lc.clearDisplay(0);
14  Serial.begin(9600);
15}
16
17void loop() {
18 
19
20  for (int i=0;i<10000;i++){
21    d1=(int)i/1000;
22    d2=((int)i/100*100-(int)i/1000*1000)/100;
23    d3=((int)i/10*10-(int)i/100*100)/10;
24    d4=i-(int)i/10*10;
25    lc.setChar(0,0,d1,false);
26    lc.setChar(0,1,d2,false);
27    lc.setChar(0,2,d3,false);
28    lc.setChar(0,3,d4,false);
29    Serial.print(d1);
30    Serial.print(d2);
31    Serial.print(d3);
32    Serial.println(d4);
33    
34    delay(20);
35  }
36 }

#include "LedControl.h"
LedControl lc=LedControl(11,13,12,1);
int  RowBits; 
int d1;
int d2;
int d3;
int d4;


void setup() {
  lc.shutdown(0,false);
  lc.setIntensity(0,4);
  lc.clearDisplay(0);
  Serial.begin(9600);
}

void loop() {
 

  for (int i=0;i<10000;i++){
    d1=(int)i/1000;
    d2=((int)i/100*100-(int)i/1000*1000)/100;
    d3=((int)i/10*10-(int)i/100*100)/10;
    d4=i-(int)i/10*10;
    lc.setChar(0,0,d1,false);
    lc.setChar(0,1,d2,false);
    lc.setChar(0,2,d3,false);
    lc.setChar(0,3,d4,false);
    Serial.print(d1);
    Serial.print(d2);
    Serial.print(d3);
    Serial.println(d4);
    
    delay(20);
  }
 }

Downloadable files

Schematics

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