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Arduino environment monitor

Posted on February 16, 2012 10:42 pm by Johan

Above is a picture of my recently (practically ) finished project. It is a sort of weather station which measures light, temperature, relative humidity, atmospheric pressure, and of course radioactivity!

The core of this setup is the excellent DIY Geiger Counter PCB by [Brohogan]. This kit is a geiger counter circuit combined with a standalone Arduino circuit. Most people buy this kit, connect an LCD and put it in a nice box. Because the Atmega328 pins are broken out via handy pin sockets it is very easy to connect any additional components and/or sensors to this PCB. Continue reading → Post ID 1010

computers-networking Electronica english Uncategorized wetenschap/science 📎and tagged arduino bash english geiger counter linux radioactivity weather station
Kneiterharde audio-onzin

Posted on January 22, 2012 10:28 pm by Johan

Een vriend stuurde mij op een chatkanaal de volgende pagina toe:

http://www.kempelektroniks.com/General/Tweaks.aspx

Ik dacht eerst bij een Nederlandstalige parodie op een doorgeschoten hifispecialist te zijn gekomen, maar naar enig gescroll kwam ik erachter dat alles op deze site gemeend was. Genoeg andere Nederlandse sites met “speciale”, enorm dure kabels welke, ondanks keiharde tegenargumenten uit de natuurkunde een enorme geluidsverbetering zouden moeten brengen.

Ik heb altijd vermaak gehad aan de hilarische, pretentieuze claims op vele audiofiele websites en aan hoe men terugkrabbelt als er door sceptici een zgn. dubbelblinde test van de gepromote produkten wordt voorgesteld.De site van Kemp Elektroniks, echter, presenteert een aantal voor mij nieuwe audiofiele “uitvindingen” waarbij ik geestelijk heen en weer werd getrokken tussen schaterlachen en alle vertrouwen in de mensheid verliezen.

Let op: Alleen verder lezen als je dit geestelijk aankan! Continue reading → Post ID 1010

Electronica skeptisch/sceptical vermaak/entertainment wetenschap/science 📎and tagged audio onzin rant sceptisch vermaak
Some tech frustrations

Posted on January 14, 2012 4:42 pm by Johan

Just some venting,

Why on earth is every interesting technical discussion forum on Yahoo Groups? I absolutely loathe its design. When requesting the main forum it presents you with unthreaded, ungrouped messages by date. To group messages by thread you have to click a link, and even then you have to click each message separately just to view it. It’s 2012 damnit, stupid threaded message boards should be a thing of the past! Continue reading → Post ID 1010

Electronica english wetenschap/science zendamateur/ham radio 📎and tagged arduino english radioactivity rant usenet yahoo groups
CPM to Sv/R conversion and workings of GM tubes

Posted on June 18, 2011 5:04 pm by Johan

(picture: “Geiger Tube” by “dh” on Flickr, showing Russian SBM-20 hard beta and gamma GM tube)

On the internet there lots of DIY people showing off their homebuilt Geiger counter circuits, complete with microprocessors and LCD’s calculating and displaying count rates and often the dose rate in microsieverts/roentgen per hour.

The last thing surely makes a project look more impressive with the floating point number with a weird unit that most people are unfamiliar with. It’s not a big deal with DIY setups but there are lots of mentions of sending projects to Japan to help people over there “measure” contamination. Continue reading → Post ID 1010

Electronica english wetenschap/science
Easy and cheap CDV-700 tube adapter

Posted on April 19, 2011 7:11 pm by Johan

I own a CDV-700 geiger counter of which the tube stopped working. It turns out that replacement tubes are both hard to find and expensive. The simplest option is to buy the LND 720 which basically is a drop-in replacement that should cost about $100.

It’s also possible to use cheaper, easier to find tubes with the CDV-700. I found the following post from radio amateur K0FF on the “Geiger Counter Enthousiasts” group on Yahoo groups. It describes a simple circuit to adapt tubes of varying voltage to the CDV-700. I built one, and it works! Continue reading → Post ID 1010

Electronica english wetenschap/science 📎and tagged civil defense Electronica english geiger counter radioactiviteit radioactivity

Arduino environment monitor

Kneiterharde audio-onzin

Some tech frustrations

CPM to Sv/R conversion and workings of GM tubes

(picture: “Geiger Tube” by “dh” on Flickr, showing Russian SBM-20 hard beta and gamma GM tube)

Easy and cheap CDV-700 tube adapter