GeigerCounter   I saw a neat looking 3.2 inch LCD touchscreen shield (http://www.sainsmart.com/arduino-compatibles-1/lcd-module/sainsmart-3-2-tft-lcd-display-touch-panel-pcb-adapter-sd-slot-for-arduino-2560.html) for Arduino on ebay for about 30 euros. Turns out this even included the Arduino Mega board! So I thought why not build a geiger counter. Because that's a perfectly sensible thing to build. And yeah I know, it's not the most amazing thing in the world. But it's a neat thing to have, and my major goal was a geiger counter for less than what you...