Hey all,thank you very much for all your help so far! Sorry for my delay, just haven't good that much time atm.Frostline is right, I do want a signal generated when the already installed (wired) doorbell rings. A separate Arduino truely isn't a so good idea. But I've heard of Attiny85 - that should also work, wouldn't it?What I am going to do next is to check the voltage - it should be 12 to 24 Volts as I recall from DrAzzy. I have not seen any transformer, yet - but I'll have a look.Afterwars I will connect a relay with the two wires from the doorbell (leaving the doorbell itself connected) and connect my Arduino/Attiny85 onto the relay? Is that kind of the idea?Again, thanks for helping!Linor
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