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Automotive microwave motion detector at home

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pw
Guest

Sat Jan 18, 2014 3:16 am   



I have an automotive microwave motion detector 2.4 GHz. However, I use
it at home, powered from the mains. It has a drawback - it is sensitive
to glitches occurring at the time of turning on and off electrical
devices (mains powered) located near wires going to the sensor. Is there
a way to make the sensor (mains powered) insensitive to this?

Thanks.

RobertMacy
Guest

Sat Jan 18, 2014 6:23 am   



On Fri, 17 Jan 2014 13:16:41 -0700, pw <x_at_y.z> wrote:

Quote:
I have an automotive microwave motion detector 2.4 GHz. However, I use
it at home, powered from the mains. It has a drawback - it is sensitive
to glitches occurring at the time of turning on and off electrical
devices (mains powered) located near wires going to the sensor. Is there
a way to make the sensor (mains powered) insensitive to this?

Thanks.


Don't know, could be something external coming in. Could be the switching
transient on the line itself [like the incandescent bulbs get upset, until
your eyes adjust], or could be a switching induced transient [spikes of
energy].

To check for external coming in. Run off battery, completely isolated from
mains, operate with transients. If no effect, connect one line to the
mains and do again.

If still no effect, get a MULTI-stage EMI Line filter. Make certain you
use the line filter well, short connections etc.

If THAT doesn't block a transient response, then you need to control your
power supply better, which seems odd, since you say this comes from an
automobile application. And everyone knows automobile power is really
awful.

I guess I'm back to "just HOW did you power this thing from the mains?"
Doesn't sound like something got preserved here.

What did you do? Use a lousy brick? One of those cheap thingies with
absolutely NO filtering? If so, maybe plugging the brick into a
multistage EMI Line Filter may work just right. ...I say multistage,
because in my experience a single stage [like those most sold] are not
very adequate and in some cases can be useless making NO difference
whatsoever!

If you're adventuresome, try taking the filter out of a dead PC supply.

Kevin McMurtrie
Guest

Sat Jan 18, 2014 8:30 am   



In article <lbc335$el2$1_at_speranza.aioe.org>, pw <x_at_y.z> wrote:

Quote:
I have an automotive microwave motion detector 2.4 GHz. However, I use
it at home, powered from the mains. It has a drawback - it is sensitive
to glitches occurring at the time of turning on and off electrical
devices (mains powered) located near wires going to the sensor. Is there
a way to make the sensor (mains powered) insensitive to this?

Thanks.


The 2.4GHz band is crowded as hell so I wouldn't trust it. Why not use
an IR motion detector module? You can buy 3-pin sensors the size of
your finger tip that include a lens of your choice, line noise
rejection, and a buffered output.

http://pewa.panasonic.com/assets/pcsd/catalog/napion-catalog.pdf

The output signal is in the microamps range so they need another output
buffer. They can technically conduct more current but you'll get
thermal feedback between the innards of the detector. A 555 chip works
great as a combination buffer and timer for driving something else.

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