GPS technology

　　GPS is a mature technology, but in China, civil product development is not very popular, mainly concentrated in navigation equipment. In schools, information about teachers' work and students' learning schedule is often transmitted through the bell ringer. The existing bell ringing instrument of the school is generally controlled by a time control switch. The time control switch is internally controlled by a single chip computer as the master chip. The travel time system mainly depends on the clock chip inside. The accuracy of the clock chip depends largely on the external crystal oscillator. There will always be errors in the accuracy of the crystal oscillator. If the time is long and the error accumulates, the system will have large errors in timing. For example, after a month, the clock is always 1 to 2 minutes faster or slower. As time goes on, the error will become larger and larger. Therefore, maintenance and calibration must be carried out manually at regular intervals. When the school area is large, multiple time control switches may be required, and the accuracy of these time control switches may not be the same. In this way, it is bound to cause the non synchronization of the work and rest ringing tones, and the connection between the ordinary time control switch and the bell ringer is realized through the wire, and the aging problem of the middle line is inevitable. The ringing control is realized through GPS timing, which can achieve accurate time without manual calibration. Transmission of control information through wireless module can separate strong current from weak current, and eliminate the wire between control equipment and controlled equipment. The circuit is simple, more safe and reliable. It has a very good application prospect for schools, enterprises and institutions, factories, troops and other occasions that need to be used for work and rest ringing and time control

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