230 volts power switch interface .
Second I would like to build an RF alternative where no direct connection between microcontroller/ XBee and the switching device is needed. For that project I needed only one additional (electronic) part and was to stingy to order it online and pay a multiple of shipping costs compared to the tiny electronic part I needed. I was surprised how much of "them" I found in my pile of old electronic devices waiting to be salvaged (you can find more about that here). Could you guess what I was looking for?
I was looking for