Paul Allen sent in this neat Processing sketch that displays data collected by my Geiger Counter kit in real-time. Counts per minute is displayed in both linear and logarithmic scales, and CPS is also shown (the white trace in the plot above). Nice work, Paul!
The only change I had to make to get this to run on my PC was to change the COM port number on line 43 (I had to set it to COM13 on my machine, yours will probably be different). I haven’t verified operation on operating systems other than Windows.
(By the way, you’ll need an FTDI TTL-232R-3V3 USB-serial cable to connect your computer to the Geiger kit!)