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Turn you r0ket into a Geiger counter!
See the R0ket Geiger counter in action here: http://www.youtube.com/watch?v=CT5gLWOLWbM
I modified an old CD-ROM audio cable for this and swapped the wires on one side.
Connection on the Geiger counter board (the black wire is not connected):
Connection on the r0ket:
The pin numbers on "m0dul A" connector are 5 for GND and 11 for Signal.
If you want to power the Geiger board from your r0ket, you need to connect the left pin from PULSE to pin 1 of the m0dul connector. Note that this only works with a firmware modified for soft rise of the +3V3_EXP output. The patch is in this repository.