gpy v2.1A exp board P19

  • P20 on the gpy moves between 3v3 & 0v on the V2.1A expansion board with

    p=Pin('P20', Pin.OUT); p.value(1)
    p=Pin('P20', Pin.OUT); p.value(0)

    but if I substitute P19 for P20 the voltage swing on that pin is only 3v3 to 0.8v
    Does anybody know why?

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