1. Home
  2. General Electronics
  3. Re: PIR interfering with wireless network

Re: PIR interfering with wireless network

We have a wireless network at work which appears to have gone downhill si=

nce the workmen installed PIRs for the burglar alarm. One of them in parti= cular appears to cause dropped packets the closer a laptop is to it. Is th= is possible?? It's not a wireless PIR as far as I know, as I can see some = leftover cable he was using which is a multicore (about 10 cores) type simi= lar to phone systems, so I assume this is for the signal aswell as power. = The person in that office swears blind that there were absolutely no proble= ms until the PIR was installed above her desk, and now when I check, about =

60% of the packets are being dropped. Moving her laptop to the opposite si= de of the room it drops only 5% of packets. PIRs used to just pick up infr= ared of your bodyheat, but I think now they are also motion sensors? Perha= ps this means they are sending out a signal and bouncing it off you? Perha= ps this could interfere with wireless networking?

You can now get ones that use microwave detection as well as PIR, they are called "Dual PIR" sensors:

formatting link

10.5GHz for the microwave

A normal PIR sensor would not cause any issues like this as they are passive.

You can simply swap a Dual PIR for a normal PIR no probems. Sensors only need a 4 conductor cable, two for power (12V), two for the contact.

Dave.

Reply to
David L. Jones
Loading thread data ...

the workmen installed PIRs for the burglar alarm. One of them in particular appears to cause dropped packets the closer a laptop is to it. Is this possible?? It's not a wireless PIR as far as I know, as I can see some leftover cable he was using which is a multicore (about 10 cores) type similar to phone systems, so I assume this is for the signal aswell as power. The person in that office swears blind that there were absolutely no problems until the PIR was installed above her desk, and now when I check, about 60% of the packets are being dropped. Moving her laptop to the opposite side of the room it drops only

5% of packets. PIRs used to just pick up infrared of your bodyheat, but I think now they are also motion sensors? Perhaps this means they are sending out a signal and bouncing it off you? Perhaps this could interfere with wireless networking?

Good point, I'll just tell them to put in a passive in any rooms with problems if I can prove it's that.

We've always had detectors though and never had problems, so maybe it's faulty? Or the new ones are on a different band. If it's using 2.4GHz, in my opinion it's wrong. Using the same band as wireless networks in an office is just plain stupid.

Odd that they left a bit of approx 10 core cable then (and that was the only thing they were fitting at the time). Unless it uses a different core for each type of detection?

--
http://www.petersparrots.com    http://www.insanevideoclips.com   
http://www.petersphotos.com

A very shy guy goes into a bar and sees a beautiful woman sitting at the bar.
After an hour of gathering up his courage, he finally goes over to her and asks,
tentatively,  "Um, would you mind if I chatted with you for a while?" To which
she responds by yelling, at the top of her lungs, "No, I won't sleep with you
tonight!"
Everyone in the bar is now staring at them.  Naturally, the guy is hopelessly
and completely embarrassed and he slinks back to his table.
After a few minutes, the woman walks over to him and apologizes.  She smiles at
him and says, "I'm sorry if I embarrassed you.  You see, I'm a graduate student
in psychology and I'm studying how people respond to embarrassing situations." 
To which he responds, at the top of his lungs, "WHAT DO YOU MEAN, $200?"
Reply to
Peter Hucker

The Arduino family seems to be gaining ground as playthings - based on the Atmega uControllers.

There's a whole IDE, libraries etc for the asking, and a kit can be had for £15 or so from the US via EBay.

Reply to
PCPaul

Hey, thanks for that, a slightly more focused search on the subject has brought back loads of interesting sample projects.

Loads to read about and scheme over. I haven't yet managed to find a write up on straight ASM programming, all they seem to push is some sort of compiled magicery. Also, shame it's so tiny on the RAM / eeprom front in these days of gigabytes for tenners. For the price it's a marvelous shortcut, including additional bells/whistles over what I'd consider standard for a single chip proc. Just, like I say, puzzlement that it doesn't seem to have caught up with what should be possible in this decade.

Thanks again

PS: I completely missed this msg initially because the 'clever' crosspost checking on this client decided I must have read it already.

Dave J.

Reply to
Dave J.

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.