[sdiy] lookup table as expo converter

[Paul Maddox]

Ingo,

> What is the resolution of the internal ADC? If it is 8 bit this would
> give you a resolution of half-semitones (or quarter tones, or 50 cent
> steps). Does it make sense to have a voltage input at all then?

the resoloution on the AVR is 10bit, but you can get 16bit ADCs for little
cost these days you know :-)

> Wouldn't you be better off with just a MIDI input?

not if you wanted to make it part of a modular synth.

> The highest ADC resolution I've seen so far on Atmel micros (8051
> compatibles) is 10 bits, and to get this accuracy the uP has to be set
> into idle mode during conversion. My supplier (Reichelt) doesn't carry
> this uP any longer, ack!

visit maxim-ic.com sometime, 3 wire 16BIT ADCs for a few $'s..

Paul