Use Matlab to get a dc voltage through microphone jack

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Miguel Lopes
Miguel Lopes 2015-2-21
评论： Miguel Lopes 2015-2-21
Hello,
I have a photoresistor that basically will output between 0 and 1V and I connected it to a microphone jack. Now I wanted to know the value of that voltage.
It doesn't need to be very precise, all I need is to distinguish between shadow and sun. Also, it doesn't need to be continuously, it's only for a short period from time to time.
Using, for instance, the daqscope, i can't see the dc signal, i can only see waves if I move in front of the photoresistor quickly.
Can anyone help me??
Thanks!!

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回答（1 个）

Rushikesh Tade
Rushikesh Tade 2015-2-21
see if this one helps : Real Time Microphone and Camera data acquisition and audio-video processing
I have not tried it but in description it is written that it can plot amplitude values of Audio.
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Miguel Lopes
Miguel Lopes 2015-2-21
Thanks for the help, but I think what I want is impossible, not due to Matlab limitations, but because the sound card in computers has a high pass filter, which doesn't allow any dc signal to go through. I found it out yesterday, so I hope this helps anyone with the same problem as me.

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