const int lookupTable[] PROGMEM = {1, 2, 3, 4, 5};  // Store lookup table in FLASH

void useLookupTable() {
    for (int i = 0; i < 5; i++) {
        int value = pgm_read_word_near(lookupTable + i);  // Read from FLASH
        Serial.println(value);
    }
}