Eyesight Preserver (the 2nd)

Published:2011/5/22 6:57:00 Author:Felicity | Keyword: Eyesight Preserver (the 2nd) | From:SeekIC

Work of the circuit The circuit consists of power circuit, ultrasonic launching circuit, ultrasonic receiving circuit, timing controlling circuit, environment light examining circuit and acousto-optic warning circuit (It is showed in picture 9-60.). Turn on power switch S and battery GB supplies 6V DC voltage to the whole circuit. When the user’s head is too near from the writing pad (the distance is less than 35cm) VL2 shines and HA makes the sound “tick tick” to alarm the user. When the regular time (45min) is over VL3 is lightened and the HA makes sound to remind the user to have a rest.



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