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A comment on How we built a Smart Office system based on Raspberry Pi. Parent comment

Re:How we built a Smart Office system based on Raspberry Pi by jasoncchild on Sunday October 23, 2016 @12:04AM (#12771880)
Yeah normally open relays with standard switches wired in parallel.
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Re:How we built a Smart Office system based on Raspberry Pi by janci on Sunday October 23, 2016 @04:57AM (#12772660)
Just don't connect one phase to the relay and different phase to the switch.
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