PiXtend V2 -L- Hardware Manual
When using external power supplies (for sensors, switches etc.), GND of PiXtend V2 -L-
must be connected to the GNDs of the other power supply units. We recommend to
connect the ground potentials of all power supplies used at a central point (bridged
terminal block) to avoid ground loops.
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Figure 60: Principle circuit diagram: GND connection
