多功能视力保护器设计

AbstractJuvenile myopia has become an increasingly serious social problem in China.As amodern common disease,myopia can hardly be cured.At present,laser resection is actuallyharmful to the natural integrity of the human body and the physical and mental health.Therefore,for a hundred years,people have been using the stupid method of "glass concaveconvex"to maintain people's eyes of seeking outside world.Research shows that 99%of thecauses of myopia are due to children's sitting posture when reading and writing,resulting intheir eyes too close to books.The design consists of three parts:distance detection circuit,light intensity detectioncircuit,timing circuit.The distance detection circuit uses the principle of ultrasonic reflection,the transmitter sends out the oscillation pulse,which is received by the receiver afterreflection,and then the amplification circuit amplifies the received signal,drives the indicatorlight to flash,and realizes the distance detection and alarm functions;the light intensitydetection circuit uses the resistance value of photosensitive resistor to change with theexternal light intensity,so as to realize the detection of environmental light and remind theuser The timing function is mainly realized by the timing function of CD4060 chip.I useSTC89C52 single chip microcomputer to control the whole system,use the automatic lightadjustment function to adjust the brightness correctly;according to the sensor to perceive theposition of the human body,judge whether to switch,or whether to send out thecorresponding warning to correct the sitting posture control mode.Key words:STC89C52;ultrasonic;photoresist;CD4060 chip