Use the same equation even when the voltage is reversed (assuming the circuit is not physically altered), don't reverse the measurement calculation because the supply has been reversed, that is obfuscating any other problems you are having.
Why are you outputting on four pins? It should only be two,
Forward
p2 = high
p3 = low
Reverse
p2 = low
p3 = high
Paralleling output pins is not a good idea, there will be contention if they are not both switched at exactly the same time unless you do a middle step of switching both to input-only. Also you need to check there is no contention at switch on.
Are the pullups/pulldown resistors off?
Why are you outputting on four pins? It should only be two,
Forward
p2 = high
p3 = low
Reverse
p2 = low
p3 = high
Paralleling output pins is not a good idea, there will be contention if they are not both switched at exactly the same time unless you do a middle step of switching both to input-only. Also you need to check there is no contention at switch on.
Are the pullups/pulldown resistors off?
Statistics: Posted by pidd — Tue May 07, 2024 5:53 am