Hi! 

I'm going to build a brightness sensor according to your guide. Looks
quite feasible to me, the only thing I'm wondering before starting:

There are 5 connection-calbes between RPi to BH1750, but two of them are
connecting "Ground (GND)". Is there a reason for two connections for
GND? I would have expected to drop one of them and use only 4
connection-cables instead, with only one for GND?


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