>  Which was why I asked if another pin could be substituted for A4

You'll find that the substitution is not equal both ways, because all other
pins can both sink and source current, whereas A4 can only sink. The
substitution of any other pin for A4 will work in almost every situation but
the substitution of A4 for any other pin might not. It's something you'd
have to look at on a case-by-case basis, bearing in mind the limitations
of A4

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