I have a Grove Base Shield and it seems that it does not work with Arduino Mega and it works for Arduino Uno (it says it is compatible to Arduino Mega)

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Hi Bill,

Thanks a lot for your quick response! I connected the base shield v2 to Arduino mega. Then I connected a Grove GPS v1.2 (Sim28) to the base shield using D2. There is no GPS reading. If I use Arduino Uno, then there is GPS reading. That is why I said that it seems this base shield is not compatible with Arduino mega. Is there something I am missing?
Best regards,

Jian