piBeacon: 3- presence monitoring download

Posted on
Tue Sep 10, 2019 12:39 pm
kw123 offline
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Posts: 6504
Joined: May 12, 2013
Location: Dallas, TX

Re: piBeacon: 3- presence monitoring download

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Added features / changes in v7.110.306 @ 2019-09-07
===================================================

1. added option for logfile size on rpi
2. fixed no reboot if no ibeacon signal parameter on RPI, it was not active

3. added INPUTcoincidence device:
    eg using 2 .. 4 geiger counters you can set up a cosmic muon detector, by requiring simultaneous (within coincidence time window) events by all used GPIOs
   The  coincidence time of  INPUTpulses from different gpios trigger is 0.1 msec to several minutes.
    this can be used to for FAST (msecs) detection of 2 events and up to several minutes
in the attached phone you can see 3 geiger counters put on top each other. Bought on eBay and amazon for $30-$50
Screen Shot 2019-09-10 at 13.29.25.png
Screen Shot 2019-09-10 at 13.29.25.png (465.17 KiB) Viewed 90 times

With these devices you can detect background radiation (electrons and gamma rays) and eg cosmic muons passing through all 3 tubes. -- these do NOT detect Alpha particles (they do not get through the glass)
In Dallas the detection rate for muons is ~ 1 per 40 secs as the active area is pretty small. The background event rate for each tube is ~ 3/secs +-

You can buy radioactive pieces (very low intensity) on the web ~ $5. Putting eg a mesh next to these detectors the rate goes up from 3/s to > 50/s
Screen Shot 2019-09-10 at 13.37.53.png
Screen Shot 2019-09-10 at 13.37.53.png (317.79 KiB) Viewed 90 times


Karl

Posted on
Tue Sep 10, 2019 4:10 pm
matt (support) offline
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Location: Texas

Re: piBeacon: 3- presence monitoring download

Neat – a DIY version of this setup?

Image

Posted on
Wed Sep 11, 2019 7:58 am
kw123 offline
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Joined: May 12, 2013
Location: Dallas, TX

Re: piBeacon: 3- presence monitoring download

Just a tiny bit simpler. ...
... back to the roots... did this 30+ years ago
https://www.google.com/search?q=crystal ... FPtmVpTNCM

Karl


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