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  • Online geiger counter using Arduino and Cacti

    Posted on April 2, 2011 6:21 pm by Johan

    I have always had an above average interest in radioactivity.  It’s a subject with political, sociological and scientific aspects. I have been mostly interested in the scientific part, but I also closely follow any news and other developments. With the earthquake in Japan and the following nuclear disaster the discussion about nuclear energy has  been fired up after being quite silent for years. In the Netherlands there was talk about building a new reactor next to the existing plant in Borssele. Well, I guess it will be a bit harder now to get support for this plan…

    To be honest, watching the developments with the damaged reactors in Japan got me thinking again. Is nuclear energy a proper way of generating electricity? Sure,  for the immediate surroundings it is very clean. There are virtually no CO2 emissions and with proper shielding and maintenance you’ll need some pretty advanced equipment to measure any radioactivity coming from a reactor. Still, uranium mining is not very nice for the environment and there is no clear solution for storage of waste. And, if a reactor malfunctions there is the possibility of widespread contamination as currently seen in Japan. So, while I am not against nuclear energy my support for it has weakened somewhat.

    Anyway, enough rambling, how to monitor radiation with your computer!

    Update 18/4: Guess I am not the only one doing some monitoring: http://radgoes.blogspot.com

     

    Continue reading → Post ID 832


    Electronica english wetenschap/science 📎and tagged arduino cacti Electronica geigercounter radioactiviteit radioactivity solderen
  • DS1820 Temp. monitoring using Linux and Cacti

    Posted on October 4, 2010 3:23 pm by Johan

    This article will try to explain how to monitor and graph temperatures remotely using Dallas Semiconductor DS18xx sensors, SNMP and Cacti. DS18xx sensors are relatively cheap, accurate and multiple sensors can be connected to a single bus.

    This guide is based on Ubuntu, so YMMV on other Linux/Unix based systems and may need modification to work properly.

    Continue reading → Post ID 832


    computers-networking Electronica english wetenschap/science 📎and tagged cacti ds1820 sensor temperature
  • Koninginnenacht/dag Utrecht

    Posted on April 29, 2010 8:23 pm by Johan

    Jaaaaahh, de stad weer propvol rommel en dronken “verrekte mongollen”. Wie heeft daar nu nou geen zin in?

    Luister op een afstandje mee naar de chaos op mijn stream van de Rode Kruis en Stadstoezicht frequenties. Klik op de volgende link of plak ’em in je mediaspelert:

    http://chelydra.dyndns.org:8000/trajectum

    Veel luisterplezier!

    -edit- Nog even een toevoeging: Ik zal kijken of ik in de toekomst meer structureel een online scanner van Utrecht kan opzetten welke gebruik zal maken van dit adres. Ook komt er misschien een centrale Online Scanners pagina voor alles wat ik heb lopen. Stay tuned dus! 🙂


    Electronica Uncategorized vermaak/entertainment zendamateur/ham radio
  • Schakelaar…

    Posted on September 28, 2009 12:53 am by Johan

    Was ik me toch even aan het klooien met een simpele drukschakelaar met een neonlampje als aan/uit indicator. Ik was bezig deze schakelaar in een kastje met een schakelende voeding te zetten.

    Zo’n schakelaar heeft drie aansluitpunten. Twee schakelpunten zijn voor de daadwerkelijke schakelaar, en de derde is voor een neonlampje. Zie het onderstaande plaatje: Continue reading → Post ID 832


    Electronica 📎and tagged Electronica rommelen schakelaar solderen
  • Review: Sangean ATS-505 Shortwave Receiver

    Posted on February 22, 2009 5:15 pm by Johan

    ats505

    Recently I purchased a Sangean ATS-505 shortwave receiver. I had some money to spend and I figured I needed a portable receiver for the summer to monitor shortwave transmissions, especially amateur radio activity. That is also the reason why this review is geared towards SWL’s and radio amateurs.

    I bought the receiver in an electronics shop in the center of the town where I live, Utrecht. It cost me about 90 euro’s. I think that is an acceptable price considering this receiver has full shortwave coverage and can receive SSB transmissions.

    Continue reading → Post ID 832


    Electronica english zendamateur/ham radio

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