[Robotgroup] RE; Any suggestion on motion sensor

[Pui Yee Hung]

Hi Eric and Paul,

Thanks!!! It was a silly mistake. The 9 V battery on the stamp board block
part of the sonar[:)].
But I definitely need some help with the code writing and thanks in advance
for your help!!!!!

Regards,

py



On 10/5/06, Eric Lundquist <roboenator at gmail.com> wrote:
>
> The docs on the Parallax site say that the range for the Ping))) is 2 cm (
> 0.8 in) to 3 meters.  I can take a look at your code at the meeting
> tonight
> to see if we can figure out what is going on.
>
> The only trouble with a PIR sensor is that it is an on or off device.
> Either it detects motion within 20 feet or it doesn't.  With the Ping)))
> you
> get a distance measurement so that your flower can react differently
> depending on how close or far away you are from it.
>
> - Eric
>
>
>
> On 10/5/06, Paul Atkinson <pma32904 at yahoo.com> wrote:
> >
> > PY,
> >
> > I expect the Ping should work for 2 feet and longer. Not sure why you
> are
> > having trouble with it.
> >
> > There is also a PIR (Passive InfraRed) sensor that is used in alarm
> > systems which could detect motion at ranges out to 20 feet. You might
> find
> > one in a motion activated light, such as a flood lamp for your driveway,
> > etc. Some use a relay to switch the load on, so you could adapt that to
> > trgieer your flower.
> >
> > You could also use infrared (assuming no other IR sources in the area -
> > beware digital cameras and cam-corders use IR.) You can send out
> modulated
> > IR and then look for the reflection. The amplitude of the reflection
> tells
> > you roughly how far away the target is. Light colors on targets make
> them
> > look closer.
> >
> > You might also set up a beam-break detector if you can have sensors
> around
> > the display. That would trigger the flower when someone gets close to
> it.
> >
> > Paul
> >
> > ----- Original Message ----
> > From: Pui Yee Hung <puiyeehung at gmail.com>
> > To: robotgroup at puremagic.com
> > Sent: Thursday, October 5, 2006 1:32:11 PM
> > Subject: [Robotgroup] RE; Any suggestion on motion sensor
> >
> > Hi all,
> >
> > I am working on a project and need some technical advise.In this
> project,
> > I
> > have a mechanical flower that start to blossom, blinking and sing song
> > when
> > it sense motion near it. And stop all the action when the motion stop.
> >
> > I try to use the "Ping" sensor to sense motion, but the range may be too
> > short.  I would like to have at least 2 to 6 feet of sesning range.   Do
> > you
> > have any suggestion for motion sensor  that may work for this
> > project?  Any
> > idea how to interface the sensor with Stamp II?
> >
> > Thanks in advance for your help!!!
> >
> > Py
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> >
> >
> >
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