motion detector as switch

[Joe]

I'm building a project where I need a battery operated motion detector to
turn on a battery powered motor whenever motion is detected. I'm using a
9-volt battery - and have very little experience in building such a circuit.
Could anyone recommend a parts place or walk me through what I need to make
this work? Thanks!

 

[Sir Charles W. Shults III]

I'm building a project where I need a battery operated motion detector to
turn on a battery powered motor whenever motion is detected. I'm using a
9-volt battery - and have very little experience in building such a circuit.
Could anyone recommend a parts place or walk me through what I need to make
this work? Thanks!

This depends on what sort of motion you want to detect and how you want to
detect it. I often purchase small passive IR sensors from surplus stores, and
once found the circuit boards (working ones, not scrap) at 3 for a dollar.
Give us a few more details if you can.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

 

[Watson A.Name - Watt Sun, Dark Remover]

I'm building a project where I need a battery operated motion detector to
turn on a battery powered motor whenever motion is detected. I'm using a
9-volt battery - and have very little experience in building such a circuit.
Could anyone recommend a parts place or walk me through what I need to make
this work? Thanks!

The motion sensor circuit will probably use as much current as a 9V
battery can supply.

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@

 

[Joe]

It just needs to detect the presence of a human from about 2-3 feet away -
I'm not familiar with how IR sensors work - but once a human is detected,
the object is activated, perhaps triggering a capacitor to discharge.

 

[Michael A. Terrell]

The motion sensor circuit will probably use as much current as a 9V
battery can supply.

Some of the PIR detectors run on their own lithium battery, and last
for seven to ten years before the battery dies.

--
14 days!


Michael A. Terrell
Central Florida

 

[James Sweet]

Last I checked you could get surplus motion detectors from Electronics
Goldmine, all you'd need to do is add an LED.

Trigger a capacitor discharge? What do you need that for? If you're trying
to build a boobytrap just remember that if someone breaks in and gets hurt,
*you* are the one likely to end up in jail, however silly it may be.