This is an expansion board that pulls out M-BUS to the outside next to M5Stack.
Since the target board is flip over and arranged side by side, you can experiment and debug while looking at the screen of M5Stack.
Features
1.Small size
It is almost twice the size of M5Stack foot print.
2.M-BUS Land
The M-BUS terminal is on the land.
3.Universal area
Since it is a universal board in the empty area, a simple circuit can be added.