Upgrade of Mini-DDL applied in the radiation field measurement

Mini-DDL is a specific device designed for radiation field real-time monitoring, which has already been applied in NSRL, SSRF and BEPC. Although these applications have proved this device to be functional and helpful, users have presented some concrete proposals for improvement according to their usage experience. Based on brief review of the previous Mini-DDL, this paper introduce technologies which are applied to upgrade the Mini-DDL, including the OLED display and the FatFs module. The new version of Mini-DDL will offer more flexible data transfer interfaces, larger and various storage capacity, capable of running in more critical environment.