Logging is an important part of any secure computer system. By analyzing logs in computer systems, you can identify early various problems and detect intrusions by attackers. Also logs can use to collect digital evidences in smart devices and to be forensics value for cybercrime investigations. In this paper, we propose a new logging scheme for smart devices and improve it to apply various environments. The proposed scheme satisfies the requirements of logging for smart devices. Thus it will help to develop a better logging in smart devices for digital evidences.