Ard Eeprom Get

In this tutorial, you'll learn about Arduino EEPROM.get Returns Garbage Data. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

EEPROM.get() reads back corrupted or unexpected values.

Quick Fix

Wrong

struct Config { int val; };  // May have padding issues

Read-back struct has wrong values due to alignment padding.

Right

#include <EEPROM.h>

// Packed struct — no padding
struct __attribute__((packed)) Config {
  uint16_t sensorMin;
  uint16_t sensorMax;
  uint32_t checksum;
};

Config cfg;

void setup() {
  Serial.begin(9600);
  EEPROM.get(0, cfg);
  Serial.print("Min: ");
  Serial.print(cfg.sensorMin);
  Serial.print(" Max: ");
  Serial.println(cfg.sensorMax);
}

Min: 0 Max: 1023  (correct values from EEPROM).

Prevention

Use attribute((packed)) for structs stored in EEPROM to avoid padding issues. Always use fixed-width types (uint16_t, int32_t) for portable EEPROM data. Verify data integrity with a checksum or magic number. EEPROM.get() works with any type that has a known size.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

FAQ