@arealguru Speaking personally, I feel that the PbHub is still not a finished product because it cannot pass two digital signals, only one In and 1 Out, not the digital signals of the HX711. Myself, if there was a need to read 5 digital sensors I would (and did in the 80's) build a multiplexer from three CMOS 4066 quad bilateral switches, that are digital, analog and bi-directional. https://www.ti.com/lit/ds/symlink/cd4066b.pdf If you are a hobbyist it would be a surprisingly simple and fun project! -Terry

@crami25 Thanks for the comprehensive reply. It really helps to deepen my understanding. As you pointed out, I always check the M5 Unit's schematic first to assure the protective resistors when I connect the Units to an ESP developing board.