Digitalizing doorbell without raspberry/arduino

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Hi everyone,
I hope it's the right place here, I just want to share my first github-project to you. It's more a hack than anything, and I would call it "smart [wired] home for poor people without raspberry/arduino" and sometimes this project got my head on the keyboard but at the end it works as it should If I'm honest I have a raspberry (III) but use it for more important things (e.g. as media center, LOL).

https://github.com/jk-85/doorbell_clientserver

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Someone asks for a circuit, so I created one and add it to the project and README. May it be useful for someone
Further I added a logfile besides Linux syslog to see all pressed bells with date and time.