Yeah you could try an external pull up resistor of 10-47K.
Perhaps the internal pull up resistor is faulty.
73 Allard PE1NWL
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On Tue, November 28, 2017 17:07, Gert Krause wrote:
Hi Allard
at A2 I measure 2V and can not find any short to ground.
Next thing I will try to wire a resitor from A2 to +5V and see what
happens - comming back.
Thanks
Gert