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Table 3 Connectors of the F031-06 voltage sensor module

From: Low-cost virtual instrumentation of PV panel characteristics using Excel and Arduino in comparison with traditional instrumentation

Pin symbol Descriptions
VCC is connected to the high side of the voltage to be measured
GND is connected to the low side of the voltage to be measured, this is the same electrical point as Arduino ground
S is connected to an Arduino analog input, this is the measured output
+ is not connected
is connected to Arduino ground