Saving data in your Arduino when turn it off

Projects Programming
1

Hello,

I'm trying to save data (count of pulses of a push button) in my Arduino, when I reset the program or for some reason the Arduino could turn off for some reason.

This way, to have my data still in the same count it was.

I hope someone could help me.

2

Check out the EEPROM library:
www.arduino.cc/en/Reference/EEPROM
--Michael

3

Look for Arduino tutorials about EEPROM, but be careful because it is really easy to use up the lifetime of your Arduino EEPROM by mistakes in the program.

4

I'm still searching for something, but nothing yet u.u

This is my code:
// this constant won't change:
const int Crimp_Right = 2; // the pin for the crimp signal R
const int Crimp_Left = 3; // the pin for the crimp signal F

// Variables will change:
int Hits_R = 0; // counter for the number of hits
int State_Right = 0; // current state of the crimp
int Last_Right = 0; // previous state of the crimp
int val = 1;
int Hits_L = 0; // counter for the number of hits
int State_Left = 0; // current state of the crimp
int Last_Left = 0; // previous state of the crimp

void setup() {
// initialize the button pin as a input:
pinMode(Crimp_Right, INPUT);
pinMode(Crimp_Left, INPUT);
// initialize serial communication:
Serial.begin(9600);
}

void loop() {
State_Right = digitalRead(Crimp_Right);
State_Left = digitalRead(Crimp_Left);

// compare the buttonState to its previous state
if (State_Right != Last_Right) {
// if the state has changed, increment the counter
if (State_Right == HIGH) {
// if the crimp state is HIGH then add a 1 to the count
Hits_R++;
Serial.println(Hits_R);
}
// save the current state as the last state,
//for next time through the loop
Last_Right = State_Right;
}
}

I want to have my count it the same number when I reset or turn off my Arduino.

5

Your code doesn't have any reference to EEPROM.
Or any code tags.

6

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If your project involves wiring, please provide a schematic and/or a wiring diagram and/or a clear photograph of the wiring.

Good Luck!

7

Simplistic example :

In setup()

EEPROM.get(0, Hits_R);  //get the previously saved value from EEPROM address zero

In loop()

Hits_R++;
EEPROM.write(0, Hits_R);  //save the new value to EEPROM address zero
8

Shouldn't that be "put", not "write"?

9

Thank you UKHeliBob!

It already worked for me :slight_smile:

10

AWOL:
Shouldn't that be "put", not "write"?

Yes it should.

I am sure that I wrote put not write but I am obviously wrong :slight_smile: