Sitting Posture Reminder Device Circuit (2)

Published:2011/5/11 1:27:00 Author:Robert | Keyword: Sitting Posture, Reminder | From:SeekIC

The sitting posture reminder device introduced in this example, should be hung on the user's ears or be installed on the hats when using. When the user's upper body or head has a big front-lean angle it would give out the voice reminder tone: Please note the myopia!Sit upright quickly! or Please note the sitting posture! . This device can not only be used for the office staffs and students' sitting posture correction, myopia protection, but also can be used as the sleep reminder for the motor vehicle drivers.The circuit's working principle is shown below.This sitting posture reminder is made up by the mercury switch (as front-lean angle sensor) S1, resistance R1, R2, capacitor C, voice integrated circuit IC, transistor V, earphone BE, power switch S2 and battery GB which is shown in the picture below.In normal time (the user's sitting posture is correct), the mercury switch S1 is disconnected, IC do not work, BE has not sound. When the user's head has a certain front-lean angle the S1 is connected to trigger IC to work. It outputs the voice electrical signal which is amplified by V and then this signal drives BL to play the voice reminder tone.The angle which trigger the alarm sound can be changed by adjusting S1's position.The tone played by BE can be adjusted by changing R2's value.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Other_circuit/Sitting_Posture_Reminder_Device_Circuit_2.html

Print this Page | Comments | Reading(3)