Use Matlab to get a dc voltage through microphone jack

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!!

Answer 1

[Rushikesh Tade]

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.

[Miguel Lopes]

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.