Schweet!
This is a big deal, since it is now possible to free up two other pins to be able to read more analog values.
For instance, the JellyBeanDriver MPGuino hardware has provisions for being able to read two user-provided analog signals. Some people here read battery voltage, while others are working to read other things (like flowmeters, and such). I am reading ambient and manifold pressure.
nickdigger's code change will enable the hardware to read 4 different user-provided analog signals. If you don't mind, I'd like to incorporate your code into v1.86.
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