A System for Classroom Selection Based on WIFI and GSM

The purpose of this design is intended to statistics and publishes classroom space information timely to students, and then save students’ time for looking study room. The system consists of a master node for remote wireless communication and two subordinate nodes for local communications in the classroom, and that three nodes are star-connected. The tasks of the master node are to collect information from the subordinate nodes and display and transmission. The master node contains count display equipment, and information transmission module. Set up two subordinate nodes for collecting information of the number who inter the bus. The devices for counting include two units, signal acquisition unit is constituted with pyroelectric infrared sensor which contains RE200B probe and conditioning circuit, and the control unit is constituted with STC90C516 for signal processing. LCD screen is used to real-time display in each node for counting the number of coming in or out the classroom. Users query current number in the classroom through SMS, and GSM module sends the data stored in the current register to the user. The manner of local communication is using Serial to WIFI. The entire system uses sensor technology and mobile network communication technology to achieve real- time acquisition and release of information. The ability to identify and stability of the experimental system currently implemented are strong