This page is intended to describe the main features of the GK-B5 kit. For full details, please refer to the Users Guide found on the GK-B5 Downloads page.
DIY Geiger invests a lot time and resources, not only in providing this open source code, but in the documentation below. Please support it by considering the original DIY Geiger Kit on this site, rather than knock-off versions that link to this page.
The setup menu is used to configure several operating parameters for the kit. It uses a mini IR remote (supplied) and an IR receiver to control a menu of setup parameters. For the most part, these are "set once" features.Settings made will be stored in EEPROM on the ATmega328, so they will be in effect when you power back on. Here is a brief description of each menu option:
Here are some of the main menu options and a video:
Instead of the usual 'clicks', tone mode produces tones that vary in frequency with the current activity - much like a metal detector. There is also an associated "null" button that resets the scale to the current activity. Tone mode is very responsive to changes in activity, and the change in pitch is much more noticeable than a change in the rate of clicks. It was primarily designed for field surveying and as far as I know, no other Geiger counter has it.
The sensitivity of the tone mode is set by the TONE SENSITIVITY menu option. Sensitivity refers to the 'bandwidth' of the tone. Sensitivity can also be adjusted by adding an external pot. The BARGRAPH MAX CPM menu setting also affects tone mode by defining the CPM that will produce the highest frequency of tone. Normally this is set to highest CPM for situation and tube being used.
In order to get the best spectrum of tones, tone mode is based on a logarithmic progression rather than a linear one. This fits with the fact that radiation intensity is inversely proportional to the square of the distance from the source.
The "null button" resets the range of tones so that the low notes are set back to the current activity. This is a useful feature when switching from a low to a high background for instance. The null button removes the higher background so increased activity may be more easily discerned.
This diagram shows the switches, buttons, etc. that are supported by the current board and software.
The controls you choose to use are up to you. The kit will work without any external controls, but you should at least add the Select Button.
The Build Instructions will have more details.
(graphic courtesy of atomic.dave)
What's included / Availability
Build Instructions and User Guide:
See the GK-B5 Downloads page for links to the appropriate Build Instructions and User Guide for your kit.
THIS DEVICE AND IT'S MEASUREMENTS IS NOT INTENDED TO GUIDE ACTIONS TO TAKE, OR NOT
REGARDING EXPOSURE TO RADIATION. THE GEIGER KIT AND IT'S SOFTWARE ARE FOR
EDUCATIONAL PURPOSES ONLY.
DO NOT RELY ON THEM IN HAZARDOUS SITUATIONS!