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Couple of questions:
Do your stairs have carpet on them
Is there a handrail, what's it made of
Does the sensor have to concealed, small, temporary or permenant
Wires or radio linked to alarm
Optical break beam,Pressure pad switch,Capacitve,Vibration,
Pyrolectric (Infra red motion) Often found on security floodlights :wink:
Ultrasonic - Doppler shift (motion) and rangefinding (proximity)
Radar - see above, Motion detection only needs a couple of simple ic's but rangefinding is a bit more complex. That and the cavities are a bit expensive and an overkill for domestic use.
Do your stairs have carpet on them: YES
Is there a handrail, what's it made of: Iron I think it's very hard
Does the sensor have to concealed, small, temporary or permenant : does not have to be concealed, snmall because there is not much room to mount on stairs, not permenant
Wires or radio linked to alarm : I was thinking of batteries, but there will be electricity to it.
It's to catch my boss when he snaeks up on us, actually he does sneak up he's just fast, and we were kidding with him that we were going to do this.
He startles me everytime :shock
The simplest solution is a stair switch pad (hide it under carpet) these are simple enough to make and cheap if u want to buy, as for wires I suggest using a type called prototyping wire. It's very very thin and almost imposibble to spot, add to your list a 9volt battery and a small buzzer and that should do it..
Ooops: should of asked where you are cos u didn't say
As for the availabilty of resources , well, that cuts both ways my friend.
I would like to get into the NASA technical brief archive but this is a privalige of US citizens and denied to me here in the UK.