EEPROM آردوینو: آموزش استفاده و نحوه کار با آن [با مثال کاربردی]

/*

Made on 22 Aug 2021
By Amirmohammad Shojaei
Home

based on randomnerdtutorials.com example

*/

#include

const int buttonPin = 7; // pushbutton pin
const int ledPin = 8; // LED pin

int ledState; // variable to hold the led state
int buttonState; // the current reading from the input pin
int lastButtonState = LOW; // the previous reading from the input pin

// the following variables are long's because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.

long lastDebounceTime = 0; // the last time the output pin was toggled
long debounceDelay = 50; // the debounce time; increase if the output flickers

void setup() {

// set input and output
pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);

//check stored LED state on EEPROM using function defined at the end of the code
checkLedState();

}

void loop() {

// read the state of the switch into a local variable
int reading = digitalRead(buttonPin);

if(reading != lastButtonState) {

// reset the debouncing timer
lastDebounceTime = millis();

}

if((millis() - lastDebounceTime) > debounceDelay) {

// whatever the reading is at, it's been there for longer
// than the debounce delay, so take it as the actual current state:
// if the button state has changed:

if(reading != buttonState) {
buttonState = reading;

// only toggle the LED if the new button state is HIGH
if(buttonState == HIGH) {
ledState = !ledState;

}
}
}

// set the LED state
digitalWrite(ledPin, ledState);

// save the current LED state in the EEPROM
EEPROM.update(0, ledState);

// save the reading. Next time through the loop,
// it'll be the lastButtonState

lastButtonState = reading;
}

// Prints and upates the LED state
// when the Arduino board restarts or powers up

void checkLedState() {
ledState = EEPROM.read(0);
if(ledState == 1) {
digitalWrite(ledPin, HIGH);
}

if(ledState == 0) {
digitalWrite(ledPin, LOW);

}