This sketch will simply blink an LED at a 1Hz frequency and increment the counter in EEPROM address 0.

led-no-sleep-experiment.ino

// Written by Peter Dalmaris from Tech Explorations.
// Used to find out how long an ESP32 can last on a LiPo battery.
// This sketch will simply blink an LED at a 1Hz frequency.
// It will increment the counter in EEPROM address 0 every time it blinks.
// https://techexplorations.com

#include "EEPROM.h"

int addr = 0;
#define EEPROM_SIZE 32

byte led_pin = 5;

// the setup function runs once when you press reset or power the board
void setup() {
  Serial.begin(115200);
  Serial.println("start...");
  if (!EEPROM.begin(EEPROM_SIZE))
  {
    Serial.println("failed to initialise EEPROM"); delay(1000000);
  }
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(led_pin, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  long count = EEPROM.readULong(addr);
  count++;
  EEPROM.writeULong(addr, count);
  EEPROM.commit();
  Serial.println(count);
  digitalWrite(led_pin, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);                       // wait for a second
  digitalWrite(led_pin, LOW);    // turn the LED off by making the voltage LOW
  delay(500);                       // wait for a second
}