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Need help with IR distance measurement sensor

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zeeekay

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Hi,
I need to plot the oscillations of a vibrating system in PC application. During oscillation the complete distance (peak to peak) is around 7 cm. I have successfully completed PC application , interfacing and micro controller part. For measuring distance, initially I used sonar but its resolution (1 inch) was not suitable for me.. I jumped to IR LED and photo transistor. They are working good enough for me in room light but in presence of sun light, it fails. I need to exhibit its working in a lab where light intensity is much more than my room.I tried using IR filter from a floppy disc but still results are not good.

Please help. Thanks in advance.
 

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