Which microcontroller for this allarm project

Hi! :open_mouth:

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:

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robott: Hi! :open_mouth:

I made a prototype of a allarm with 3 PIR sensors and one buzz with Arduino One. It works fine!

Atmel Attiny85 http://www.forkrobotics.com/wp-content/uploads/2012/04/attiny85pinout1.png

You can program it with Arduino UNO as isp, you have to download Attiny85 core and add it to boards on Arduino IDE. Attiny85 core for Arduino 1.0.X https://code.google.com/p/arduino-tiny/downloads/detail?name=arduino-tiny-0100-0018.zip

If you add more stuff then change to Arduino mini pro (Atmega328P) http://www.apcc.tk/images/phocagallery/tech/Arduino-mini-pro/thumbs/phoca_thumb_l_Arduino-mini-pro-size-long-33mm.jpg