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Fingerprint sensor AT77C101B

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kondor

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I have a problem in using this sensor. Can somebody help me?
I'm acquiring frames and there is only a noise on frames.
When I put finger on it, there is still only noise. There is no finger on image.
And the noise is strange. Almost every column in frame has pixels with the same color. The image looks like bar-code.
What can be wrong?
I use clock 1Mhz and read 500 fps.
 

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