@tokuhira said in PLUS Module problem about PORTB and PORTC: Please check your PLUS. [image: 1553865301365-swapped-ports.jpg] Thats wrong A0 and A1 are connected to the black port, Rx and TX are connected to the blue port.

@watson [image: 1552903271442-53808727_264318361185264_1820011547234140160_n-resized.jpg] Thank you sir, knife it work.

@ajb2k3, @watson Thank you so much. Uuum, stacking is very convenient but considering batteries is not convenient.

@dave-nardella Theoretically, it's OK.

Great, sorry you had to hack around to get all the modules to work together. We are working on improving the design to resolve these issues. What did you make? @tokuhira would love to see your project if you don't mind sharing.