have a look at this post
https://forum.arduino.cc/index.php?topic=536408.0
BTW, that p100 pins is on the geiger board, your wording/phrasing is a bit confusing.
There are quite a few references to that module, try Google
have a look at this post
https://forum.arduino.cc/index.php?topic=536408.0
BTW, that p100 pins is on the geiger board, your wording/phrasing is a bit confusing.
There are quite a few references to that module, try Google