Multiple sensors on Arduino

I'm trying to have multiple sensor connected to arduino. I have tried by using the guide from (http://arduinotronics.blogspot.sg/2012/ ... orial.html ) and it works well with my gas sensor. Now i am trying to add on a motion sensor and a dry contact. The output will have 3 led each connected to individual sensor to sense if the sensor detect anything. Thank you!

The motion sensor i'm using is (http://www.mpja.com/download/31227sc.pdf)

Thank you for sharing that. It's not that hard to do, so lots of success with it. If you do run in trouble, don't hesitate to ask on this forum !