Alarm diy with arduino

[patj88]

@Bend94

Two extra questions, regarding pir sensors , it is possible to do the same cabling for pir sensor? What kind of pir sensor should I use? Is there normally open and normally closed pir sensors?

Do you know If I can find an ups for arduino if the thief shutdown my electrical network?

I would use NC contacts, if a thief cuts a cable the system will detect it. Ups don't have to be difficult. An AC relay with a NO/NC CONTACT can activate a battery via the NC contact if the power is shutdown.