I have acquired a PIR D203S infrared motion sensor and I want to
interface it to an ooBot 4. I have been testing it with a multimeter
and I cannot get a readable signal out of it so I assume I need some
kind of amplifer circuit to get a usuable level out of it. Can anyone
suggest a simple amp circuit that I can use to do this? Thanks.

Datasheet for the sensor is located at
http://www.futurlec.com/PIR_D203S.shtml



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Check these guys out - I've built this circuit and it works great. Look
at the motion detector project.

DLC

jporterwbtcorp wrote:
> I have acquired a PIR D203S infrared motion sensor and I want to
> interface it to an ooBot 4. I have been testing it with a multimeter
> and I cannot get a readable signal out of it so I assume I need some
> kind of amplifer circuit to get a usuable level out of it. Can anyone
> suggest a simple amp circuit that I can use to do this? Thanks.
>
> Datasheet for the sensor is located at
> http://www.futurlec.com/PIR_D203S.shtml
>
>
>



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Dennis:

Thanks for the quick reply... but I think you forgot to put in the
URL for people you were referring to...
--- In o...@yahoogroups.com, ooPIC Tech Support
wrote:
>
> Check these guys out - I've built this circuit and it works great.
Look
> at the motion detector project.
>
> DLC
>
> jporterwbtcorp wrote:
> > I have acquired a PIR D203S infrared motion sensor and I want to
> > interface it to an ooBot 4. I have been testing it with a
multimeter
> > and I cannot get a readable signal out of it so I assume I need
some
> > kind of amplifer circuit to get a usuable level out of it. Can
anyone
> > suggest a simple amp circuit that I can use to do this? Thanks.
> >
> > Datasheet for the sensor is located at
> > http://www.futurlec.com/PIR_D203S.shtml
> >
> >
> >
> >
> >

______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


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--- In o...@yahoogroups.com, "jporterwbtcorp" wrote:
>
> I have acquired a PIR D203S infrared motion sensor and I want to
> interface it to an ooBot 4. I have been testing it with a multimeter
> and I cannot get a readable signal out of it so I assume I need some
> kind of amplifer circuit to get a usuable level out of it. Can anyone
> suggest a simple amp circuit that I can use to do this? Thanks.
>
> Datasheet for the sensor is located at
> http://www.futurlec.com/PIR_D203S.shtml
>

Did you look at the circuitry on page 4 of the datasheet? You have a
sensor that requires A LOT of support circuitry before you can
interface it to a uC like the OOPic.

You should be looking at the PIR Sensor Module (with the dome cover a
little further down the page at Futurelec) that includes all of the
electronics. These are easy to interface. I have several that I use
for Halloween effects.

Richard



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Richard:

I did look at that circuit which is why I am posting for a simpler
one. A lot of that circuit is for tripping a 12 volt relay which is
irrelevant to interfacing to an MCU. And I do have that Futurelec
motion sensor module -- it's a very nice unit, and reasonably priced,
but it doesn't meet the requirements for my particular application.
--- In o...@yahoogroups.com, "rtstofer" wrote:
>
> --- In o...@yahoogroups.com, "jporterwbtcorp" wrote:
> >
> > I have acquired a PIR D203S infrared motion sensor and I want to
> > interface it to an ooBot 4. I have been testing it with a
multimeter
> > and I cannot get a readable signal out of it so I assume I need
some
> > kind of amplifer circuit to get a usuable level out of it. Can
anyone
> > suggest a simple amp circuit that I can use to do this? Thanks.
> >
> > Datasheet for the sensor is located at
> > http://www.futurlec.com/PIR_D203S.shtml
> > Did you look at the circuitry on page 4 of the datasheet? You have
a
> sensor that requires A LOT of support circuitry before you can
> interface it to a uC like the OOPic.
>
> You should be looking at the PIR Sensor Module (with the dome cover
a
> little further down the page at Futurelec) that includes all of the
> electronics. These are easy to interface. I have several that I
use
> for Halloween effects.
>
> Richard
>



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--- In o...@yahoogroups.com, "jporterwbtcorp" wrote:
>
> Richard:
>
> I did look at that circuit which is why I am posting for a simpler
> one. A lot of that circuit is for tripping a 12 volt relay which is
> irrelevant to interfacing to an MCU. And I do have that Futurelec
> motion sensor module -- it's a very nice unit, and reasonably priced,
> but it doesn't meet the requirements for my particular application.
>

I think you are going to need the circuitry right up to the final
transistor that triggers the relay. According to the device datasheet
(which could be better), the output is something like 3500 mV peak to
peak. To me, that implies an AC output of some kind.

Sure enough, the first thing the circuit does is strip off the high
frequencies with a low pass filter. Then it runs into that op amp
circuit and I'm not sure what it does but it looks like an
integrator/peak detector. The output is still AC although at a low
frequency (10 ufd capacitor coupling to the next stage) which, I
think, is an integrator. Finally, we get to the dual comparators that
determine that the final signal has exceed some threshold (high or
low) and one or the other drives the output transistor.

I don't think you are going to get a circuit that is much simpler.
You need everything right up to that transistor.

Then again, analog circuits aren't my thing. I could be way off but I
doubt it. In the end, they have done just what you would expect of a
black box: take the input signal, beat on it until it does what is
required and, finally, drive an output. If it could be simpler, they
would have done it.

Look at all the parts on the PIR Sensor Module! They wouldn't be
there if they weren't required!

Richard



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