Andy's Postbag and random ebay links

Tell us about the cool things you've recently got
User avatar
ahull
Posts: 1648
Joined: Mon Apr 27, 2015 11:04 pm
Location: Sunny Scotland
Contact:

Re: Andy's Postbag and random ebay links

Post by ahull » Fri May 26, 2017 9:01 am

Nice.. that part looks familiar.


Look around the 7:54 mark.

I don't know what the range of them is, nor whether we can extract the speed of the target from them, but they could be very useful for switching on lighting and other loads, in response to movement.

I notice that they are considerably cheaper on http://www.ebay.com.au/ than they are on ebay.co.uk but the postage to the UK is $3.50 :( - however if you check ebay.com you can get them cheaper, with free P+P - I think I'll grab a couple too, from here -> http://www.ebay.co.uk/itm/RCWL-0516-Swi ... Swi7RZH~yx

I see there are holes for a CDS LDR, and I happen to have a ton of those, so I might fit that. I presume it turns it in to a night time only version.

You might also like to take a look at this...

http://tech.scargill.net/microwave-radar/

..this ..

https://electronics.stackexchange.com/q ... tor-module

.. this..

http://images.100y.com.tw/pdf_file/54-RCWL-0516.pdf

.. and the schematic ..
rcwl-0516-schematic.jpg
rcwl-0516-schematic.jpg (27.34 KiB) Viewed 323 times
.. and of course this...

- Andy Hull -

ag123
Posts: 795
Joined: Thu Jul 21, 2016 4:24 pm

Re: Andy's Postbag and random ebay links

Post by ag123 » Fri May 26, 2017 9:49 am

i'm not sure about the cheap(er) radars, but someone has tried mounting the HB100 on a tv microwave dish and posted a video :lol:

User avatar
ahull
Posts: 1648
Joined: Mon Apr 27, 2015 11:04 pm
Location: Sunny Scotland
Contact:

Re: Andy's Postbag and random ebay links

Post by ahull » Fri May 26, 2017 10:16 am

Strangely enough I was just thinking, I wonder what the best way to focus one of these would be. I was going to build a tuned wave guide out of fr4, but a sat dish might be simpler and easier to come by, especially since the exact frequency these things operate on appears to be a movable feast. Maybe some parabolic tinfoil reflector experiments are in order.
- Andy Hull -

ag123
Posts: 795
Joined: Thu Jul 21, 2016 4:24 pm

Re: Andy's Postbag and random ebay links

Post by ag123 » Fri May 26, 2017 10:19 am

well, i'm thinking if someone decides to discard their old satellite dish and fit a new shiny one, then you may be in luck to pick that up. otherwise perhaps we can improvise an umbrella?

oh google never seem to fail to find incredible ideas :lol:
http://www.freeantennas.com/projects/template/
Last edited by ag123 on Fri May 26, 2017 10:40 am, edited 2 times in total.

User avatar
ahull
Posts: 1648
Joined: Mon Apr 27, 2015 11:04 pm
Location: Sunny Scotland
Contact:

Re: Andy's Postbag and random ebay links

Post by ahull » Fri May 26, 2017 10:27 am

This is interesting -> http://tech.scargill.net/microwave-for-the-weekend/
If you want to do something clever, the 16 pin logic chip – I stuck a scope on it and pin 12 gives off some interesting analog stuff!
Based on the datasheet that is presumably the 2nd stage amplification output of the doplar shift, so it could be the key to speed detection.

21m range, unfocussed would allow me to detect cars on the road outside, so I might not even need a reflector (but adding one would probably keep the noise down from reflections from other vehicles). I could also simply use two modules a couple of meters apart, staring straight ahead through slits and count the time between triggers to estimate speed.
- Andy Hull -

User avatar
RogerClark
Posts: 7422
Joined: Mon Apr 27, 2015 10:36 am
Location: Melbourne, Australia
Contact:

Re: Andy's Postbag and random ebay links

Post by RogerClark » Fri May 26, 2017 10:43 am

Definitely seems an interesting device

Well worth £1 !

I'll let you know when mine arrive.

User avatar
ahull
Posts: 1648
Joined: Mon Apr 27, 2015 11:04 pm
Location: Sunny Scotland
Contact:

Re: Andy's Postbag and random ebay links

Post by ahull » Fri May 26, 2017 11:00 am

RogerClark wrote:I'll let you know when mine arrive.
Likewise. I decided that four was a good round number, since I'll probably blow at least two of them up while experimenting. :D
- Andy Hull -

User avatar
RogerClark
Posts: 7422
Joined: Mon Apr 27, 2015 10:36 am
Location: Melbourne, Australia
Contact:

Re: Andy's Postbag and random ebay links

Post by RogerClark » Fri May 26, 2017 11:09 am

Ummm.

I only ordered 3..

I think someone on eBay did a deal on 5 of them, but that was for UK only, so over here they are $1 AUD individually, which is about 57p

Sometimes I get a good deal as they price in round numbers and because the Aussie dollar is not worth as much as a pound, I get stuff cheaper ;-)

Goodness knows when they will arrive however, as some other stuff I ordered has taken 8 to 10 weeks to arrive.

ag123
Posts: 795
Joined: Thu Jul 21, 2016 4:24 pm

Re: Andy's Postbag and random ebay links

Post by ag123 » Fri May 26, 2017 11:45 am

actually if your WIFI router or even better network cards with multiple antennas has those MIMO and very important CSI (nope that isn't the CSI drama on TV, CSI stands for Channel State Information), you could probably use that as your radar
http://pdcc.ntu.edu.sg/wands/Atheros/
http://pdcc.ntu.edu.sg/wands/Atheros/DeviceList.html
https://dhalperi.github.io/linux-80211n-csitool/
http://www.halper.in/pubs/globecom2010_ ... oppler.pdf
http://www.fiercewireless.com/tech/dopp ... rchers-say
http://people.csail.mit.edu/fadel/wivi/
^^ perhaps you could even 'see through walls' with those :lol:

User avatar
ahull
Posts: 1648
Joined: Mon Apr 27, 2015 11:04 pm
Location: Sunny Scotland
Contact:

Re: Andy's Postbag and random ebay links

Post by ahull » Fri May 26, 2017 12:27 pm

ag123 wrote:actually if your WIFI router or even better network cards with multiple antennas has those MIMO and very important CSI (nope that isn't the CSI drama on TV, CSI stands for Channel State Information), you could probably use that as your radar
http://pdcc.ntu.edu.sg/wands/Atheros/
http://pdcc.ntu.edu.sg/wands/Atheros/DeviceList.html
https://dhalperi.github.io/linux-80211n-csitool/
http://www.halper.in/pubs/globecom2010_ ... oppler.pdf
http://www.fiercewireless.com/tech/dopp ... rchers-say
http://people.csail.mit.edu/fadel/wivi/
^^ perhaps you could even 'see through walls' with those :lol:
That's very interesting... one thing I haven't mentioned.. I regularly "see" passing wifi. Mostly mobile phones, but also Ambulances and other vehicles fitted with WiFi (one of the local farmers has WiFi on his tractor with the SSID arnpriorpumpkins :lol: ).. So I could possibly also estimate the speed of those vehicles by looking at doppler shift directly, but using reflected WiFi might also be an option.
- Andy Hull -

Post Reply