I need an electronic sensor - Electronic Circuits Projects Diagrams Free

nford · 29th July 2003, 03:42 AM

I need a schematic or plans for an electronic sensor. I want it to sound an alarm when someone walks up a set of stairs.
Any help would be appreciated.

tansis · 29th July 2003, 09:30 PM

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

Sensor circuits:
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.

nford · 29th July 2003, 09:39 PM

Hi

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

tansis · 29th July 2003, 09:54 PM

Cor blimey guv, someones alive on this thing.....

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..

nford · 29th July 2003, 09:56 PM

That sounds great, Now for the question, where do I find a plan, can I just search for a stair switch pad, if I was to buy one?

Thanks again for all your help.

Cheers

tansis · 29th July 2003, 10:32 PM

Try the phrase "Stair Pressure Matt" that should get a result,

if you are in the uk this is one source.
http://www.electrotec-alarms.co.uk/cattabfra6.html

Check out links to "Gadget Shops"
http://www.gadgetshop.com/tgs/defaultframes.asp
3rd page in "Spy Tracker" this is a much better solution!

nford · 30th July 2003, 04:19 PM

Thank you, I'll check these out

I live in Arizona, it would be nice to have the resources you on your side of the world

tansis · 30th July 2003, 06:32 PM

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.

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29th July 2003, 03:42 AM	(permalink)
nford	I need an electronic sensor I need a schematic or plans for an electronic sensor. I want it to sound an alarm when someone walks up a set of stairs. Any help would be appreciated.

29th July 2003, 09:30 PM	(permalink)
tansis	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 Sensor circuits: 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.

29th July 2003, 09:39 PM	(permalink)
nford	Hi 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

29th July 2003, 09:54 PM	(permalink)
tansis	Cor blimey guv, someones alive on this thing..... 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..

29th July 2003, 09:56 PM	(permalink)
nford	That sounds great, Now for the question, where do I find a plan, can I just search for a stair switch pad, if I was to buy one? Thanks again for all your help. Cheers

29th July 2003, 10:32 PM	(permalink)
tansis	Try the phrase "Stair Pressure Matt" that should get a result, if you are in the uk this is one source. http://www.electrotec-alarms.co.uk/cattabfra6.html Check out links to "Gadget Shops" http://www.gadgetshop.com/tgs/defaultframes.asp 3rd page in "Spy Tracker" this is a much better solution!

30th July 2003, 04:19 PM	(permalink)
nford	Thank you, I'll check these out I live in Arizona, it would be nice to have the resources you on your side of the world

30th July 2003, 06:32 PM	(permalink)
tansis	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.