pygmc 0.4.0

Python package for Geiger–Müller Counter (GMC)

PyGMC

Python Geiger–Müller Counter (GMC) USB serial interface for GQ Electronics brand.

Installation

pip install pygmc

Example Usage

import pygmc

gc = pygmc.connect()

ver = gc.get_version()
print(ver)

cpm = gc.get_cpm()
print(cpm)

Devices

• GMC-300S (confirmed works)
• GMC-300E Plus / GMC-300E+
• GMC-320 Plus / GMC-320+ (confirmed works)
• GMC-320S
• GMC-500
• GMC-500 Plus / GMC-500+ (confirmed works)

Any GQ GMC device following communication protocol RFC1201 or RFC1801.

Notes

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

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Known Issues

• 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.