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[on:]

I need an audio tone level monitor that can display levels from -50db to 0. I have an op amp circuit  that I found that can take in my steady audio tone and convert it to a DC voltage that is displayed on an LCD. At 0db my LCD reads 620, at -15db I get 590, at -30db I get 112 and at -50db I get a value of 2.
If there at a way to use the log on the arduino to get a value of 0 for 0db, -10 for -10db then it would be much appreciated.

 

[Reply #1 on:]

If there at a way to use the log on the arduino to get a value of 0 for 0db, -10 for -10db then it would be much appreciated.

Use the log? Do you mean the log function?

[Reply #2 on:]

Yes, the log function. I suck at math so i'm searching now to see if something like this has been done before.