Is it acceptable to use an analog pin to read voltage outputs from another pin on a Spark Core?

General
1

Say I wanted to read voltage levels to determine stability or for debugging on a particular GPIO and I didn’t have a multimeter handy, could I just run a wire over to an analog pin, call analogRead(), and then output it to Serial for viewing?

Initially, I don’t see an issue with it. Does anyone else recommend against it?

2

That should work fine, but keep in mind that the analog input pins are limited to 3.3 volts.

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