How to use Arduino built-in EEPROM memory

In this tutorial I will show you how to use Arduino built in eeprom to preserve data so it is not wiped out when Arduino is restarted.

Dec 29, 2021

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LGPL3+

Arduino User Group

Devices & Components

Arduino Nano

Pushbutton Switch, Momentary

LilyPad LED Blue (5pcs)

Software & Tools

Arduino IDE

Project description

Code

Remembering the sequence of lit LEDs

arduino

1 #include <EEPROM.h>
2
3  boolean record=false;
4  boolean button_pressed=false;
5  int G=HIGH;
6  int R=HIGH;
7  int W=HIGH;
8    int End=HIGH;
9  int eeprom_address=0;
10  unsigned long Time=0;
11
12  void replay_the_sequence(){
13    for (int index  = 0 ; index < EEPROM.length(); index++) {
14    digitalWrite(EEPROM.read(index),HIGH);
15    delay(1000);
16    digitalWrite(EEPROM.read(index),LOW);
17    delay(1000);
18  }
19
20  }
21  
22  void setup() {
23    Serial.begin(9600);
24    pinMode(A1,INPUT_PULLUP);
25    pinMode(A2,INPUT_PULLUP);
26    pinMode(A3,INPUT_PULLUP); 
27    pinMode(A0,INPUT_PULLUP);  
28    
29    pinMode(5,OUTPUT);
30    pinMode(6,OUTPUT);
31    pinMode(7,OUTPUT);
32
33  }
34  
35  void loop() {
36    G=digitalRead(A1);
37    R=digitalRead(A2);
38    W=digitalRead(A3);
39    End=digitalRead(A0);
40    digitalWrite(7,!G);
41    digitalWrite(6,!R);
42    digitalWrite(5,!W);
43    
44
45    if ((G==0  or R==0 or W==0)and record==false) {
46      for (int i = 0 ; i < 30 ; i++) EEPROM.write(i,  0);
47      record=true;
48      eeprom_address=0;
49    }
50
51    if (record==true  and button_pressed==false){
52    
53       if (G==0 or R==0 or W==0){
54         button_pressed=true;
55         if (G==0) EEPROM.write(eeprom_address,7);
56         if (R==0) EEPROM.write(eeprom_address,6);
57         if (W==0) EEPROM.write(eeprom_address,5);
58         eeprom_address++;  
59         Time=millis();
60       } 
61    }   
62    if (G==1 and R==1 and  W==1 and millis()-Time>300) button_pressed=false; 
63    if (End==0 and record==true)  record=false;
64    if (End==0 and record==false)replay_the_sequence();
65  
66  }

 #include <EEPROM.h>

  boolean record=false;
  boolean button_pressed=false;
  int G=HIGH;
  int R=HIGH;
  int W=HIGH;
    int End=HIGH;
  int eeprom_address=0;
  unsigned long Time=0;

  void replay_the_sequence(){
    for (int index  = 0 ; index < EEPROM.length(); index++) {
    digitalWrite(EEPROM.read(index),HIGH);
    delay(1000);
    digitalWrite(EEPROM.read(index),LOW);
    delay(1000);
  }

  }
  
  void setup() {
    Serial.begin(9600);
    pinMode(A1,INPUT_PULLUP);
    pinMode(A2,INPUT_PULLUP);
    pinMode(A3,INPUT_PULLUP); 
    pinMode(A0,INPUT_PULLUP);  
    
    pinMode(5,OUTPUT);
    pinMode(6,OUTPUT);
    pinMode(7,OUTPUT);

  }
  
  void loop() {
    G=digitalRead(A1);
    R=digitalRead(A2);
    W=digitalRead(A3);
    End=digitalRead(A0);
    digitalWrite(7,!G);
    digitalWrite(6,!R);
    digitalWrite(5,!W);
    

    if ((G==0  or R==0 or W==0)and record==false) {
      for (int i = 0 ; i < 30 ; i++) EEPROM.write(i,  0);
      record=true;
      eeprom_address=0;
    }

    if (record==true  and button_pressed==false){
    
       if (G==0 or R==0 or W==0){
         button_pressed=true;
         if (G==0) EEPROM.write(eeprom_address,7);
         if (R==0) EEPROM.write(eeprom_address,6);
         if (W==0) EEPROM.write(eeprom_address,5);
         eeprom_address++;  
         Time=millis();
       } 
    }   
    if (G==1 and R==1 and  W==1 and millis()-Time>300) button_pressed=false; 
    if (End==0 and record==true)  record=false;
    if (End==0 and record==false)replay_the_sequence();
  
  }

Remembering the sequence of lit LEDs

arduino

1 #include <EEPROM.h>
2
3  boolean record=false;
4  boolean button_pressed=false;
5   int G=HIGH;
6  int R=HIGH;
7  int W=HIGH;
8    int End=HIGH;
9  int eeprom_address=0;
10   unsigned long Time=0;
11
12  void replay_the_sequence(){
13    for (int index   = 0 ; index < EEPROM.length(); index++) {
14    digitalWrite(EEPROM.read(index),HIGH);
15     delay(1000);
16    digitalWrite(EEPROM.read(index),LOW);
17    delay(1000);
18   }
19
20  }
21  
22  void setup() {
23    Serial.begin(9600);
24    pinMode(A1,INPUT_PULLUP);
25     pinMode(A2,INPUT_PULLUP);
26    pinMode(A3,INPUT_PULLUP); 
27    pinMode(A0,INPUT_PULLUP);   
28    
29    pinMode(5,OUTPUT);
30    pinMode(6,OUTPUT);
31    pinMode(7,OUTPUT);
32
33   }
34  
35  void loop() {
36    G=digitalRead(A1);
37    R=digitalRead(A2);
38     W=digitalRead(A3);
39    End=digitalRead(A0);
40    digitalWrite(7,!G);
41     digitalWrite(6,!R);
42    digitalWrite(5,!W);
43    
44
45    if ((G==0   or R==0 or W==0)and record==false) {
46      for (int i = 0 ; i < 30 ; i++) EEPROM.write(i,   0);
47      record=true;
48      eeprom_address=0;
49    }
50
51    if (record==true   and button_pressed==false){
52    
53       if (G==0 or R==0 or W==0){
54         button_pressed=true;
55          if (G==0) EEPROM.write(eeprom_address,7);
56         if (R==0) EEPROM.write(eeprom_address,6);
57          if (W==0) EEPROM.write(eeprom_address,5);
58         eeprom_address++;   
59         Time=millis();
60       } 
61    }   
62    if (G==1 and R==1 and   W==1 and millis()-Time>300) button_pressed=false; 
63    if (End==0 and record==true)   record=false;
64    if (End==0 and record==false)replay_the_sequence();
65  
66   }

 #include <EEPROM.h>

  boolean record=false;
  boolean button_pressed=false;
   int G=HIGH;
  int R=HIGH;
  int W=HIGH;
    int End=HIGH;
  int eeprom_address=0;
   unsigned long Time=0;

  void replay_the_sequence(){
    for (int index   = 0 ; index < EEPROM.length(); index++) {
    digitalWrite(EEPROM.read(index),HIGH);
     delay(1000);
    digitalWrite(EEPROM.read(index),LOW);
    delay(1000);
   }

  }
  
  void setup() {
    Serial.begin(9600);
    pinMode(A1,INPUT_PULLUP);
     pinMode(A2,INPUT_PULLUP);
    pinMode(A3,INPUT_PULLUP); 
    pinMode(A0,INPUT_PULLUP);   
    
    pinMode(5,OUTPUT);
    pinMode(6,OUTPUT);
    pinMode(7,OUTPUT);

   }
  
  void loop() {
    G=digitalRead(A1);
    R=digitalRead(A2);
     W=digitalRead(A3);
    End=digitalRead(A0);
    digitalWrite(7,!G);
     digitalWrite(6,!R);
    digitalWrite(5,!W);
    

    if ((G==0   or R==0 or W==0)and record==false) {
      for (int i = 0 ; i < 30 ; i++) EEPROM.write(i,   0);
      record=true;
      eeprom_address=0;
    }

    if (record==true   and button_pressed==false){
    
       if (G==0 or R==0 or W==0){
         button_pressed=true;
          if (G==0) EEPROM.write(eeprom_address,7);
         if (R==0) EEPROM.write(eeprom_address,6);
          if (W==0) EEPROM.write(eeprom_address,5);
         eeprom_address++;   
         Time=millis();
       } 
    }   
    if (G==1 and R==1 and   W==1 and millis()-Time>300) button_pressed=false; 
    if (End==0 and record==true)   record=false;
    if (End==0 and record==false)replay_the_sequence();
  
   }

Remembering the sequence of lit LEDS remebering each LED duration

arduino

1 #include <EEPROM.h>
2
3  struct LED_PLUS_TIME {
4    int PIN;
5
6    unsigned long Interval;
7  };
8  
9  boolean record=false;
10  boolean
11  button_pressed=false;
12  int G=HIGH;
13  int R=HIGH;
14  int W=HIGH;
15  int
16  End=HIGH;
17  int index=0;
18  int eeprom_address=0;
19  unsigned long Time=0;
20
21  LED_PLUS_TIME  LED;
22  LED_PLUS_TIME L_AND_T;
23  
24
25  void replay_the_sequence(){
26
27   eeprom_address=0; 
28   for (int i = 0 ; i < 10; i++) {
29      EEPROM.get(eeprom_address,L_AND_T);
30
31      digitalWrite(L_AND_T.PIN,HIGH);
32      delay(L_AND_T.Interval);
33      digitalWrite(L_AND_T.PIN,LOW);
34
35      delay(1000);
36      eeprom_address+=sizeof(L_AND_T);
37 }
38
39  }
40
41  
42  void setup() {
43    Serial.begin(9600);
44    pinMode(A1,INPUT_PULLUP);
45
46    pinMode(A2,INPUT_PULLUP);
47    pinMode(A3,INPUT_PULLUP); 
48    pinMode(A0,INPUT_PULLUP);
49  
50    
51    pinMode(5,OUTPUT);
52    pinMode(6,OUTPUT);
53    pinMode(7,OUTPUT);
54
55
56  }
57  
58  void loop() {
59    G=digitalRead(A1);
60    R=digitalRead(A2);
61
62    W=digitalRead(A3);
63    End=digitalRead(A0);
64    digitalWrite(7,!G);
65
66    digitalWrite(6,!R);
67    digitalWrite(5,!W);
68    
69
70    if ((G==0
71  or R==0 or W==0)and record==false) {
72      for (int i = 0 ; i < 100; i++) EEPROM.update(i,
73  0);
74      record=true;
75      eeprom_address=0;
76      index=0;
77    }
78
79
80    if (record==true and button_pressed==false){
81    
82       if (G==0 or R==0
83  or W==0){
84         button_pressed=true;
85         if (G==0) LED.PIN=7;
86
87         if (R==0) LED.PIN=6;
88         if (W==0) LED.PIN=5;
89         Time=millis();
90
91       } 
92    }   
93    if (G==1 and R==1 and W==1 and millis()-Time>300 and
94  button_pressed==true ) {
95      LED.Interval= millis()-Time;
96      EEPROM.put(eeprom_address,LED);
97
98      eeprom_address+=sizeof(LED);
99      button_pressed=false; 
100      index++;
101
102  
103    }
104    if (End==0 and record==true)  record=false;  
105    if (End==0
106  and record==false)replay_the_sequence();  
107 
108  }

 #include <EEPROM.h>

  struct LED_PLUS_TIME {
    int PIN;

    unsigned long Interval;
  };
  
  boolean record=false;
  boolean
  button_pressed=false;
  int G=HIGH;
  int R=HIGH;
  int W=HIGH;
  int
  End=HIGH;
  int index=0;
  int eeprom_address=0;
  unsigned long Time=0;

  LED_PLUS_TIME  LED;
  LED_PLUS_TIME L_AND_T;
  

  void replay_the_sequence(){

   eeprom_address=0; 
   for (int i = 0 ; i < 10; i++) {
      EEPROM.get(eeprom_address,L_AND_T);

      digitalWrite(L_AND_T.PIN,HIGH);
      delay(L_AND_T.Interval);
      digitalWrite(L_AND_T.PIN,LOW);

      delay(1000);
      eeprom_address+=sizeof(L_AND_T);
 }

  }

  
  void setup() {
    Serial.begin(9600);
    pinMode(A1,INPUT_PULLUP);

    pinMode(A2,INPUT_PULLUP);
    pinMode(A3,INPUT_PULLUP); 
    pinMode(A0,INPUT_PULLUP);
  
    
    pinMode(5,OUTPUT);
    pinMode(6,OUTPUT);
    pinMode(7,OUTPUT);


  }
  
  void loop() {
    G=digitalRead(A1);
    R=digitalRead(A2);

    W=digitalRead(A3);
    End=digitalRead(A0);
    digitalWrite(7,!G);

    digitalWrite(6,!R);
    digitalWrite(5,!W);
    

    if ((G==0
  or R==0 or W==0)and record==false) {
      for (int i = 0 ; i < 100; i++) EEPROM.update(i,
  0);
      record=true;
      eeprom_address=0;
      index=0;
    }


    if (record==true and button_pressed==false){
    
       if (G==0 or R==0
  or W==0){
         button_pressed=true;
         if (G==0) LED.PIN=7;

         if (R==0) LED.PIN=6;
         if (W==0) LED.PIN=5;
         Time=millis();

       } 
    }   
    if (G==1 and R==1 and W==1 and millis()-Time>300 and
  button_pressed==true ) {
      LED.Interval= millis()-Time;
      EEPROM.put(eeprom_address,LED);

      eeprom_address+=sizeof(LED);
      button_pressed=false; 
      index++;

  
    }
    if (End==0 and record==true)  record=false;  
    if (End==0
  and record==false)replay_the_sequence();  
 
  }

Remembering the sequence of lit LEDS remebering each LED duration

arduino

1 #include <EEPROM.h>
2
3  struct LED_PLUS_TIME {
4    int PIN;
5    unsigned long Interval;
6  };
7  
8  boolean record=false;
9  boolean  button_pressed=false;
10  int G=HIGH;
11  int R=HIGH;
12  int W=HIGH;
13  int  End=HIGH;
14  int index=0;
15  int eeprom_address=0;
16  unsigned long Time=0;
17  LED_PLUS_TIME  LED;
18  LED_PLUS_TIME L_AND_T;
19  
20
21  void replay_the_sequence(){
22   eeprom_address=0; 
23   for (int i = 0 ; i < 10; i++) {
24      EEPROM.get(eeprom_address,L_AND_T);
25      digitalWrite(L_AND_T.PIN,HIGH);
26      delay(L_AND_T.Interval);
27      digitalWrite(L_AND_T.PIN,LOW);
28      delay(1000);
29      eeprom_address+=sizeof(L_AND_T);
30 }
31
32  }
33  
34  void setup() {
35    Serial.begin(9600);
36    pinMode(A1,INPUT_PULLUP);
37    pinMode(A2,INPUT_PULLUP);
38    pinMode(A3,INPUT_PULLUP); 
39    pinMode(A0,INPUT_PULLUP);  
40    
41    pinMode(5,OUTPUT);
42    pinMode(6,OUTPUT);
43    pinMode(7,OUTPUT);
44
45  }
46  
47  void loop() {
48    G=digitalRead(A1);
49    R=digitalRead(A2);
50    W=digitalRead(A3);
51    End=digitalRead(A0);
52    digitalWrite(7,!G);
53    digitalWrite(6,!R);
54    digitalWrite(5,!W);
55    
56
57    if ((G==0  or R==0 or W==0)and record==false) {
58      for (int i = 0 ; i < 100; i++) EEPROM.update(i,  0);
59      record=true;
60      eeprom_address=0;
61      index=0;
62    }
63
64    if (record==true and button_pressed==false){
65    
66       if (G==0 or R==0  or W==0){
67         button_pressed=true;
68         if (G==0) LED.PIN=7;
69         if (R==0) LED.PIN=6;
70         if (W==0) LED.PIN=5;
71         Time=millis();
72       } 
73    }   
74    if (G==1 and R==1 and W==1 and millis()-Time>300 and  button_pressed==true ) {
75      LED.Interval= millis()-Time;
76      EEPROM.put(eeprom_address,LED);
77      eeprom_address+=sizeof(LED);
78      button_pressed=false; 
79      index++;
80  
81    }
82    if (End==0 and record==true)  record=false;  
83    if (End==0  and record==false)replay_the_sequence();  
84 
85  }

 #include <EEPROM.h>

  struct LED_PLUS_TIME {
    int PIN;
    unsigned long Interval;
  };
  
  boolean record=false;
  boolean  button_pressed=false;
  int G=HIGH;
  int R=HIGH;
  int W=HIGH;
  int  End=HIGH;
  int index=0;
  int eeprom_address=0;
  unsigned long Time=0;
  LED_PLUS_TIME  LED;
  LED_PLUS_TIME L_AND_T;
  

  void replay_the_sequence(){
   eeprom_address=0; 
   for (int i = 0 ; i < 10; i++) {
      EEPROM.get(eeprom_address,L_AND_T);
      digitalWrite(L_AND_T.PIN,HIGH);
      delay(L_AND_T.Interval);
      digitalWrite(L_AND_T.PIN,LOW);
      delay(1000);
      eeprom_address+=sizeof(L_AND_T);
 }

  }
  
  void setup() {
    Serial.begin(9600);
    pinMode(A1,INPUT_PULLUP);
    pinMode(A2,INPUT_PULLUP);
    pinMode(A3,INPUT_PULLUP); 
    pinMode(A0,INPUT_PULLUP);  
    
    pinMode(5,OUTPUT);
    pinMode(6,OUTPUT);
    pinMode(7,OUTPUT);

  }
  
  void loop() {
    G=digitalRead(A1);
    R=digitalRead(A2);
    W=digitalRead(A3);
    End=digitalRead(A0);
    digitalWrite(7,!G);
    digitalWrite(6,!R);
    digitalWrite(5,!W);
    

    if ((G==0  or R==0 or W==0)and record==false) {
      for (int i = 0 ; i < 100; i++) EEPROM.update(i,  0);
      record=true;
      eeprom_address=0;
      index=0;
    }

    if (record==true and button_pressed==false){
    
       if (G==0 or R==0  or W==0){
         button_pressed=true;
         if (G==0) LED.PIN=7;
         if (R==0) LED.PIN=6;
         if (W==0) LED.PIN=5;
         Time=millis();
       } 
    }   
    if (G==1 and R==1 and W==1 and millis()-Time>300 and  button_pressed==true ) {
      LED.Interval= millis()-Time;
      EEPROM.put(eeprom_address,LED);
      eeprom_address+=sizeof(LED);
      button_pressed=false; 
      index++;
  
    }
    if (End==0 and record==true)  record=false;  
    if (End==0  and record==false)replay_the_sequence();  
 
  }

Remembering the last lit LED out of 3

arduino

1 #include <EEPROM.h>
2  byte led_to_lit=0;
3  byte led_lit=0;
4  
5  void setup() {
6    Serial.begin(9600);
7    pinMode(A1,INPUT_PULLUP);
8    pinMode(A2,INPUT_PULLUP);
9    pinMode(A3,INPUT_PULLUP);   
10    
11    pinMode(5,OUTPUT);
12    pinMode(6,OUTPUT);
13    pinMode(7,OUTPUT);
14    led_to_lit=EEPROM.read(0);
15    digitalWrite(led_to_lit,HIGH);  
16  }
17  
18  void loop() {
19    if(digitalRead(A1)==0)  led_to_lit=7;
20    if(digitalRead(A2)==0)led_to_lit=6;
21    if(digitalRead(A3)==0)led_to_lit=5;
22    
23    if(led_to_lit!=0 and led_to_lit!=led_lit){
24      if (led_to_lit==7){digitalWrite(7,HIGH);digitalWrite(6,LOW);digitalWrite(5,LOW);EEPROM.write(0,  7);}
25      if (led_to_lit==6){digitalWrite(7,LOW);digitalWrite(6,HIGH);digitalWrite(5,LOW);EEPROM.write(0,  6); }
26      if (led_to_lit==5){digitalWrite(7,LOW);digitalWrite(6,LOW);digitalWrite(5,HIGH);EEPROM.write(0,  5);}
27      EEPROM.write(0,led_to_lit  );
28      Serial.println(led_to_lit);
29    }
30    led_lit=led_to_lit;
31    
32  }

 #include <EEPROM.h>
  byte led_to_lit=0;
  byte led_lit=0;
  
  void setup() {
    Serial.begin(9600);
    pinMode(A1,INPUT_PULLUP);
    pinMode(A2,INPUT_PULLUP);
    pinMode(A3,INPUT_PULLUP);   
    
    pinMode(5,OUTPUT);
    pinMode(6,OUTPUT);
    pinMode(7,OUTPUT);
    led_to_lit=EEPROM.read(0);
    digitalWrite(led_to_lit,HIGH);  
  }
  
  void loop() {
    if(digitalRead(A1)==0)  led_to_lit=7;
    if(digitalRead(A2)==0)led_to_lit=6;
    if(digitalRead(A3)==0)led_to_lit=5;
    
    if(led_to_lit!=0 and led_to_lit!=led_lit){
      if (led_to_lit==7){digitalWrite(7,HIGH);digitalWrite(6,LOW);digitalWrite(5,LOW);EEPROM.write(0,  7);}
      if (led_to_lit==6){digitalWrite(7,LOW);digitalWrite(6,HIGH);digitalWrite(5,LOW);EEPROM.write(0,  6); }
      if (led_to_lit==5){digitalWrite(7,LOW);digitalWrite(6,LOW);digitalWrite(5,HIGH);EEPROM.write(0,  5);}
      EEPROM.write(0,led_to_lit  );
      Serial.println(led_to_lit);
    }
    led_lit=led_to_lit;
    
  }

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