make a simple alarm

hi everyone could anyone tell me the best way to make a simple alarm for my shed using 2 arduino's simple as if some one breaks in it triggers the other arduino to make a buzzer work ether bluetooth or 433mhz transmitter and reciver cheers for any help

If you are putting one in the shed and one in your house I would use a JeeNode. JeeNode is a small Arduino with a radio built in. Very easy to use.

I use 2 for my weather station.

http://moderndevice.com/product/jeenode-v6-kit/

yes one in the shed and the other in the house so it can be portable im using 2 nano's

The buzzer part is probably easiest. I think the first step is to define what you mean by break in. Does that mean a window is broken, a door opened or are something else?

lets say if using a reed switch ether the circuit is made or broken that it will let the other arduino know somthing has changed . so emitting a signal to other arduino to let it know

Well, you could try using a Nano with an Xbee. You would need two of them, one for sending and one for receiving. This board seems to make connecting them easier. http://www.robotshop.com/en/arduino-nano-xbee-board.html

Here is an Xbee that Adafruit sells. http://www.adafruit.com/products/128

One other thing to consider is how far away the shed is from your house.

Frankly, I find using JeeNodes easier than Xbees, but that is me.

the shed is only 20 meters away