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What is this HC-05 5 pin module of which you speak ? HC-05s have about 30 pads.
He means a breakout board like this one:
I'm curious as to what it does as well.
Its an interrupt pin, according to the data I can find.
This pin is low while connection is off. When HC 05 is paired with another bluetooth this pin turn High, so if you connect it to an Arduino digital input you can monitorize the connection state.
I read the article you shared, but when I try it out on my hc 05, the state pin just stays LOW, regardless of whether it is paired to my android phone or not.
My hc05 module has a built in button ,and is marked zs-040, if that means anything.
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Posted:Dec 23, 2015
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