The terminal device’s kernel is the single-chip
microcomputer of ACR series. The wireless RF module —
nRF905, is built to communicate with the local computer
and transmit the data of the usage state of the classroom
(class period, examinations, self-study courses, etc.). The
infrared technology is used to detect the situation of passing
people at each entrance of the classroom, to obtain the
statistics of the student number in classroom. A new method
of mutual emission infrared-ray to detect and statistic the
number of students is adopted in this system, which is
low-cost and realizes the intellectualization of the system. A
circuit which consists of linear photosensitive resister candetect the intensity of environmental light, and intelligently
set the lights-on-off photosensitive value. The “pre-set
value” is set by remote controllers. The system can
intelligently judge the reasonable condition if lamps should
be turned on, through the usage status of the classroom, the
student number in classroom and the environmental light
level, and determine the control status and level of the
indoor electrical equipment, to achieve the maximum
energy-saving.