Method write_header

src/sd_logger/SD_Logger.cpp:58–64

}

void SD_Logger::write_header() {
    _index = 0;
    String header = "ID, TIMESTAMP, Data1, Data2, Data3, Data4, Data5, Data6, Data7, Data8, Data9\n\r";
    header.toCharArray(&(_buffer[_index]), header.length());
    _index += header.length() - 1; // -1 to remove null terminator
    dump_to_sd();
}

bool SD_Logger::open_file() {
    if (_opened) return true;