MightyOhm.com

FYI...Here is a 4 part video on an Arduino Geiger Counter Shield which can work with several types of Geiger tubes...
http://www.youtube.com/watch?v=haHRm7Uvi28

Regards,
Tony

I would not worry about the LED resistor, just leave as is for both voltages, or compromise and use a 220 ohm.

The jumper for R6 is a good idea!

-Tony

Follow this post to see the mod and the Arduino sketch for adding an LCD with the Arduino Uno

viewtopic.php?f=15&t=3431

-Tony

This post will provide a good starting point for adding an LCD display (using Arduino Uno and a typical 16x2 LCD). I have made a minor hardware mod to the Geiger Counter board, according to Jeff. This will allow the geiger board to operate on 5 volts instead of 3 volts, which will make the serial ou...

See this post, should get you going...

viewtopic.php?f=15&t=3437

-Tony

Hi Jeff, Yes, changing the resisors worked fine. I noticed with the original R6 of 330 ohms, the pulse duty cycle was close to 50% at 3v. With the R6 change to 1K and 5v the pulse duty cycle was around 30%, but at 5v instead of 3v. With this mod no level translators are required and I can feed the o...

Hi,

Can I use 5v with the gieger counter kit so the output of the AVR serial port will be 5v instead of 3v?

Thanks,
Tony