Sitting Position Reminder(2)

Published:2011/5/10 0:37:00 Author:Sue | Keyword: Sitting Position, Reminder | From:SeekIC

The reminder introduced here will be put on the user's ears or hat. When the user's sitting position is not proper, it can make the warning sound of Please pay attention to your sitting position . It can be used to help office stuff and students to keep proper sitting position and avoid myopia, or to be used as doze reminder for drivers. Working principle: As seen in the figure 6-213, the reminder consists of mercurial switch(as leaning angle sensor)S1, resistor R1,R2, capacitor C, audio integrated circuit IC, transistor V, earphones BE, power switch S2 and battery GB. When the sitting position is proper, S1 is disconnected and the whole circuit does't work. When user's head lean forward to a certain angle, S1 is connected and IC is triggered to work. After the output audio signal is amplified by V, BL will make a warning sound. When we change S1's position, the angle to trigger the warning can be changed. When we change R2's value, the tone of BE's sound can be changed. Choices of components: R1:1/8 metal film resistor; R2: After adjusting the tone with variable resistor, we should connect a 1/8 fixed resistor. C:High frequency ceramic capacitor. V:S9013 or S8050 silicon NPN transistor. IC: Audio integrated circuit with saved signal of Please pay attention to your sitting position such as KD56028. S1:φ3·5mm glass mercurial switch; S2: miniture toggle switch. BE:Stereophone's inside sounder. GB:Button cells.



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