Hi guys,
So... even if this project appears to be quite simple, I think I'll choose to by the alarm.
To be realistic, doing it by myself will take weeks, months probably (I'm always working on 2 or 3 things at the same time) and if I want to be sure it's gonna work...
I could have it done for 100 to 150€, for 200€ I got one on the market so let's choose the simple way this time.
Anyway, thanks for your help, maybe see you on the next project/idea !