I measured radioactivity during my vacation in Japan, Fukushima.

Last week I came back from Japan. During my vacation trip I've logged radiation data using my Geiger counter. I have gathered samples at various places at Tokyo (including Tokyu Disneyland), Narita Airport From/To Tokyo, Tokyo From/To Osaka,  Osaka From / To Hiroshima. See my travel map below:

The red line in the map above follows my travel route where I did my the measurements

My measuring.....

123d beta 9 is not 123d designer, alternatives?

In my exploration in 3D modelling last year 2012, I've researched for a good CAD program below 1000$. It seemed that there are a lot of options like SketchUp, Autodesk, Alibre, FreeCad, and a lot more. Since I'm an EE, I mostly build simple and small cases or structures for electronics. Usually simple structures below 5x5x5cm's.

Please note that I'm using the applications for hobby usage only. 

So my time is limited to just several hours a week. I'm sure with certain applications you can make the best objects if you master the application thoroughly, however, I'm more looking for a quick fix where the application can be productive the very first few hours.

I've started with SketchUp (Free), moved on to Alibre (paid, below 1000$), then Autodesk 123d (free) beta 9 and now Cubify Invent (50$).

Measuring power from my solarpanels

Today I finally had some spare hours to do the following; measure the DC voltage and current from my solar panels (2 pieces, total 380 watt peak) and convert this into power. That way I can finally see how much is actually generated by the solar panels.

I used an Arduino, adapted my Wireless Garden SensorStick and attached it to a rail-to-rail OpAmp from Microchip....