Sitting Posture Reminder Device Circuit (1)

Published:2011/5/11 1:29:00 Author:Robert | Keyword: Sitting Posture, Reminder | From:SeekIC

When the primary and secondary students are reading or writing, if their sitting posture is not correct for a long time, it would easily affect their vision and physical health. The sitting posture reminder device introduced in this example can remind the users when their reading or writing posture is not correct by giving out the sound: DD or voice reminder tone. So it can remind the user to note their posture and fix it.The circuit's working principle is shown below.This sitting posture reminder device circuit is made up by electronic switch circuit GB, alarm circuit and power circuit which is shown in the picture below.The electronic switch circuit is made up by glass shell mercury switch S2, transistor V1, V2 and resistance R1~R3.The power circuit is made up by power GB and power switch S1.When he power switch S1 is connected, the power GB would be supply the whole circuit with the working voltage.When the user's reading or writing posture is correct, the mercury switch S2 would be disconnected and the transistor V1 and V2 are all disconnected. The integrated circuit IC is not working and BL has no sound.When the user's sitting posture is front-lean (near the desktop), the S2 would be connected and V1 and V2 are al connected. V2's emitter output high voltage level to the IC's TRIG port to trigger the IC to work. Then its output port (OUT) would output the audio signal, which is amplified by V3, to drive the speaker to give out the DD' alarm sound or play the voice reminder tone: Please note myopia! Sit upright quickly! .



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