With the emergence of intelligent sensors (referred to as motes in this paper) which have certain kinds of computing and wireless communication ability, more and more IoT (Internet of Things) applications can be implemented to sense, judge and react locally according to the environment and its changes. Because of the limitation of motes' awareness and perception scope, they need collaborative sensing to be fully aware of environment states and to better adapt to the changing environment. Traditional mote collaborative sensing mechanisms require developers to focus too much on interaction logics and can hardly adapt to the changing environment. To avoid over spending effort on interaction logics while ensuring that the projects can adapt to the unstable environment, this paper proposes a tuple space based collaborative sensing mechanism for intelligent sensors. It makes communication process completely transparent to developers. This paper also implements a simple demonstration to show how to use this mechanism to build system and how this system adapts to the environment.