PROTO Board is a pure universal prototype pegboard. You can have the total freedom to make your own project as you want it, with prototyping pegboard that allows laying out the customized circuit to interact with the M5 core via M-BUS.
I have experienced a bad contact to the M-Bus of the M5Stack. Could be the reason is on the M5Stack side, but I have switched to a normal PCB with normal longer connectors to be on the safe side. With former deliveries bought from Amazon I had no issues.
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just right to experiment.Needs still some cover to close off the m5 from bellow