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

•

1010 views

•

0 respects

•

Arduino User Group

Components and supplies

Arduino Nano R3

Pushbutton Switch, Momentary

LilyPad LED Blue (5pcs)

Apps and platforms

Arduino IDE 2.0 (beta)

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;
    
  }

Downloadable files

Connectivity

Comments

Only logged in users can leave comments

Dziubym

0 Followers

•

0 Projects

Intro

Components and supplies

Apps and platforms

Project description

Code

Downloadable files