Andy's Postbag and random ebay links

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ag123
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Re: Andy's Postbag and random ebay links

Post by ag123 » Sat May 13, 2017 7:23 am

i think those doppler radars (https://en.wikipedia.org/wiki/Doppler_radar) used a *fixed* frequency echo to make life easier doing the calcs, but as we are doing *tyre noise* the calcs may need to be more esoteric in terms of filtering and change detection (a few hz differences in doppler shifts) along with a huge noise spectrum, but perhaps that can be done as well :lol:
Last edited by ag123 on Sat May 13, 2017 7:32 am, edited 3 times in total.

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Squonk42
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Re: Andy's Postbag and random ebay links

Post by Squonk42 » Sat May 13, 2017 7:25 am

ag123 wrote:there are tons of touch panels for the modern smart phones hi-tech capacitive (multi) touch often with the controller
http://www.ebay.com/sch/i.html?_odkw=4+ ... l&_sacat=0
the only trouble is that often a google search for how to interface them tend to turn up a blank

hope someone can pester some of the manufacturers to release the specs then all our arduinos would become capacitive multi touch as well and cheap :lol:
Here is a dev board to adapt the iPod Nano v6 MiPi screen with capacitive touch panel:
http://www.techtoys.com.hk/Displays/SSD ... ch-EVK.htm

I would like to replace the bridge chip by an STM32, using the findings from:
http://www.electricstuff.co.uk/nanohack.html
https://www.mixdown.ca/redmine/projects ... og_Summary

ag123
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Re: Andy's Postbag and random ebay links

Post by ag123 » Sat May 13, 2017 7:26 am

nice :D

ag123
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Re: Andy's Postbag and random ebay links

Post by ag123 » Sat May 13, 2017 8:12 am

ahull wrote:
zoomx wrote:Maybe it's better a spectrogram app that can do this
Image
Nice.. what is the App?
oh googled this, it runs on PC though, i'd guess spectrogram is somewhat too compute intensive to run on embedded (arduino or android) :D
http://spek.cc/

oh incorrect, many more on google play :D
https://play.google.com/store/search?q= ... ram&c=apps
https://play.google.com/store/search?q=fft

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RogerClark
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Re: Andy's Postbag and random ebay links

Post by RogerClark » Sat May 13, 2017 9:29 pm

I looked on eBay and there seem to be small doppler radar modules for around 5 pounds (GBP).

These seem to use a device called a HB100.

Im not sure if they output a voltage which is dependant on the doppler shift or the frequency of the shift, which is apparenitly a few hundred Hz for someone walking.

Either way, they look like they are investigating.

Edit.

I just googled for HB100 Arduino and it looks like its all been done already using that module. Including various youtube videos

ag123
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Re: Andy's Postbag and random ebay links

Post by ag123 » Sun May 14, 2017 7:02 am

yup HB100 seem like something fun to combine with the andy's stm32duino O'scope :lol:


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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Sun May 14, 2017 9:46 am

The module is pretty cheap, all I need now is the magic missing ingredient... Loads of spare time. :D
EDIT: The datasheet wouldn't hurt too, so here's a copy -> https://www.limpkin.fr/public/HB100/HB1 ... n_Note.pdf
- Andy Hull -

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zoomx
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Re: Andy's Postbag and random ebay links

Post by zoomx » Mon May 15, 2017 6:32 am

I found this old post about it

Making the electronics for a $7 USD doppler motion sensor
http://www.limpkin.fr/index.php?post/20 ... ion-sensor
It seems that this sensor needs some electronics.

Edit: this one has code and a schematic for the preampiflier for the low signal that came from this module.
https://www.youtube.com/watch?v=TwmwfbFrPk4

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RogerClark
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Re: Andy's Postbag and random ebay links

Post by RogerClark » Fri May 26, 2017 2:10 am

I found an even cheaper Doppler radio module, for $1 AUD (less than one GBP)

http://www.ebay.com.au/itm/262783104831

http://www.ebay.co.uk/sch/i.html?_from= ... or&_sop=12

I also found some info on github

https://github.com/jdesbonnet/RCWL-0516/

So. I've ordered 3 of them!

I may never get around to using them, but they should work as intruder detectors if not speed sensors

ag123
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Re: Andy's Postbag and random ebay links

Post by ag123 » Fri May 26, 2017 8:49 am

i think one of the members here actually posted a video on those cheap radar sensors :D
https://www.youtube.com/watch?v=9WiJJgIi3W0

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