powersensor for 230v AC with 5v output - Raspberry Pi Forums

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hi together,
need in our project.

image
http://fs2.directupload.net/images/150407/d7mpw7mf.png

simple circuit control lamp on raspberry using pcf expander board,
relay switching lamp (~230v).

relay switched via expander board.
once lamp switched on or off normal lightswitch,
raspberry should receive information status has changed.

know options send 5v signal input pin of expander board,
if circuit (~ 230v) closed or open?

need solution in form of possible small , cheap board,
preferably in combination relay.

following board should work, need assessment.
there better solutions?

http://de.aliexpress.com/item/free-ship ... 82240.html
http://de.aliexpress.com/item/5a-ac-cur ... 68708.html

regards,
daniel

assenda wrote:the relay switched via expander board.
pcf8574 board bad idea that.
consider mcp23017 or little sister 8 gpio (much, much, better)


raspberrypi



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