Abstract:

This system to AT89C52 single chip computer as control device of intelligent parts,adopts heat release infrared sensor detects the release of human existence and adopts photoconductive resistance constitutes circuit testing environment light intensity.According to the classroom light conditions and  the measured the signal of human body system and ambient light,the system can make reasonable and intelligent judgment and then controls the work of classroom lighting circuit.It is a effective way to avoid the classroom of waste electricity.

Key words: auto-control system of classroom lights;heat release infrared sensor;photoconductive dynatron;AT89C52