PyGMC is a Python API for Geiger–Müller Counters (GMCs) / Geiger Counters. It has just one dependency (pyserial) and works on multiple operating systems: Windows, OSX, Linux. PyGMC aims to be a minimalistic interface - lowering the installation requirements and allowing the user to build their own tools on top of a stable package.

• PYPI
• Documentation

pip install pygmc

import pygmc

gc = pygmc.connect()

ver = gc.get_version()
print(ver)

cpm = gc.get_cpm()
print(cpm)

import pygmc

gc = pygmc.GMC320('/dev/ttyUSB0')

cpm = gc.get_cpm()
print(cpm)

import pandas as pd
import pygmc

gc = pygmc.GMC320('/dev/ttyUSB0')

history = gc.get_history_data()
df = pd.DataFrame(history[1:], columns=history[0])

✔️✔️=physically confirmed works
✔️=user confirmed works
*Incorrect documentation caused incorrect implementation with pygmc<=0.10.0

• Thomaz
• Huy

• Alternative Python projects for GQ GMC:
  • GeigerLog
  • gq-gmc-control
  • gmc
• Device website GQ Electronics Seattle, WA
  • Not affiliated in any way.

• Ubuntu Issue
  • Ubuntu requires fixing a bug to be able to connect to any GQ GMC device.
    USB devices use VID (vendor ID) and PID (Divice ID)... It is common for unrelated devices to use a common manufacture for their USB interface. The issue with Ubuntu is that it assumes 1A86:7523 is a "Braille" device (for the blind) and, ironically, blindly treats it as such.
  • This causes the GQ GMC device to not connect.
• Ubuntu fix
  • The fix is to comment out the udev rule that does this. The text file may be in two places.
    • /usr/lib/udev/85-brltty.rules
    • /usr/lib/udev/rules.d/85-brltty.rules
  • Find the line below and comment it out.
    • ENV{PRODUCT}=="1a86/7523/*", ENV{BRLTTY_BRAILLE_DRIVER}="bm", GOTO="brltty_usb_run"
  • We see Ubuntu assumes 1A86:7523 is a Baum [NLS eReader Zoomax (20 cells)] device.