avgDev_us,minDev_us,maxDev_us,temp,pressure,humidity void appendToLog(const AggregatedEntry &e) { File f = LittleFS.open(DATA_FILE, FILE_APPEND); if (!f) { Serial.println("Failed to open log file for append."); return; } f.printf("%ld,%u,%lld,%lld,%lld,%.2f,%.2f,%.2f\n", (long)e.epoch, e.count, (long long