What kind of sensor can I use for the described case?

"It has a pad which you place under the crib mattress and if the slightest movements are not detected for specified period of time even while your baby sleeps the unit will sound an alarm. There are some other newer models of baby movement monitor that are attached directly to the baby diaper.You simply just clip it to the waistband near the belly button of your baby’s diaper and if the motion is not detected within 15-20 seconds the built- in vibrator will turn on and will trigger your baby to breathe,if after 5 seconds no movement is detected a signal will be sent to the baby monitor unit which will sound an alarm alerting you to check on your baby"

People, I would like to know which kind of motion or movement sensor that I can use for the above case or purpose?

People, I would like to know which kind of motion or movement sensor that I can use for the above case or purpose?

As you are asking for opinions and advice on a potential life saving applications, I would never offer an opinion. Best to stick to commercial/professional products for things like this. It's like asking for information on how best to design and build a CAT scanner for home use, not a good idea. :wink:

I don't intend to make a baby movement detection mat. It's more like, I am curious as to which kind of sensor can detect an object which is still and making movement. So, if you don't mind is there some projects i can refer or some sensors like that in market i can use.

http://www.amazon.com/Geo-Phone-Paranormal-Research-Tool/dp/B004E5DWCK/ref=sr_1_1?ie=UTF8&qid=1318835495&sr=8-1

From what I understand Geophone detects ground movement. So, for example the baby is lying on the crib, and I want to detect whether the baby is moving or not. Can, I use Geophone for that because the vibrations will be small to detect right.

yaantey:
From what I understand Geophone detects ground movement. So, for example the baby is lying on the crib, and I want to detect whether the baby is moving or not. Can, I use Geophone for that because the vibrations will be small to detect right.

I don’t intend to make a baby movement detection mat.