VU meter

So I have decided on a VU meter for the bar table. I did some quick searches online for ideas and it seems that most projects only measure the overall volume. This might be a problem as I do not know the average volume of the room during the formal, so I will have to be able to adjust on the fly. Secondly, I am not satisfied with just overall volume, I think there should be at least a few frequency levels as well. I need to have a way to filter the input frequencies into bands and then process it for the Arduino in terms of amplitude. That might be a problem, as I will need most of the I/Os already for the multiplexed LED matrix. I guess I could go to a MEGA and not worry about it, but that’s extra dough. I think I have 18 pins to work with?


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