#include <EEPROM.h>

unsigned long startTime;
unsigned long elapsedTime;
const int EEPROM_ADDRESS = 0;  // The address in EEPROM to store the elapsed time

void setup() {
  Serial.begin(9600);

  // Read the saved elapsed time from EEPROM
  unsigned long savedTime = 0;
  EEPROM.get(EEPROM_ADDRESS, savedTime);

  Serial.print("Saved time: ");
  Serial.print(savedTime / 1000);
  Serial.println(" seconds");

  // Set the startTime considering the saved elapsed time
  startTime = millis() - savedTime;
}

void loop() {
  elapsedTime = millis() - startTime;

  Serial.print("Elapsed time: ");
  Serial.print(elapsedTime / 1000);  // Convert to seconds
  Serial.println(" seconds");

  // Save the elapsed time to EEPROM every second
  if (elapsedTime % 1000 < 50) {  // Adding a small range to avoid writing multiple times within the same second
    EEPROM.write(EEPROM_ADDRESS, elapsedTime);
  }

  // Perform other tasks
  delay(1000);  // Update every second
}