I made a prototype of a allarm with 3 PIR sensors and one buzz with Arduino One. It works fine!
Now i'd like to leave Arduino ad make a dedicated circuit.
Which is the minimun microcontroller you suggest me? (I'd prefer Atmel microcontroller)!
Thinking also that in the future i'd like to add an RF transmitter, a GSM transmitter (with a sim) and maybe a small photocamera. :open_mouth: