EEPROM technique

Troubleshooting
3

To expand on @ScruffR’s answer, I usually use a struct with a version field so I know when to initialize the storage.

const int currentVersion = 10;
struct {
  int version;
  int NextFeedTimeHr;    // values from 1 to 23
  int NextFeedTimeMin;  // values 0 to 59
} storage;

void setup() {
  EEPROM.get(0, storage);
  if (storage.version != currentVersion) {
    storage.version = currentVersion;
    storage.NextFeedTimeHr = 18;
    storage.NextFeedTimeMin = 0;
    saveStorage();
  }
}

void loop() {
  // do stuff and call saveStorage() to persist data
}

void saveStorage() {
  EEPROM.put(0, storage);
}
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