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K124 abyx-GK5 with LND7317Geiger Counterby Atomic.daveThis is a
one of a kind custom hand-crafted Geiger Counter built by
Atomic.Dave based on a kit designed by the original creator of the
DIY Arduino based Geiger Counter Kit- user: Brohogan. For over 4
years, I have built and sold about 150 of these devices, with very
good results, and fantastic feedback by ebay customers. All
information for this device is available at the developers website
and its a good idea to visit the site from time to time as the
software and other parts of it may change, upgrade or improve.
PLEASE TAKE TIME TO READ ALL THE MATERIAL BEFORE ASKING QUESTIONS.
Most likely you will be able to find the answer yourself but I am
here to assist and explain if you need me to. As I have said
before, this is not s store bought or produced device. It is more
of a meter for someone who knows a about this type of tech, but
doesnt have the time, abillity or patience to build it, or would
rather pay someone else do all the work. Having been built by me,
and not a maching, there could be some imperfections, although
minimal. The following instructions will help you to understand the
basic operation of this meter. Once you have used it a couple
times, it should be pretty easy for you to operate.
OPERATIONOn the face of the unit starting from the top is the
Remote control IR sensor, the LCD backlit display with a contrast
pot to the right of it, Speaker grilled vent, 2 LEDS, 4 triple pole
slide switches. On the right side are two momentary switches. The
top one is the Mode control, and the bottom one is for NULL reset.
Before turning on the device, please read and understand this
simple guide. Follow the label to locate the listed switches
below:
LEDSAfter powering the GC on, you will hear the beeping of the
piezo as your GM tube picks up radiation events. The GREEN LED is
for radiation events and coincides with the beeping piezo which can
be muted with the SOUND switch. The RED LED will only light up when
a set alarm threshold is reached. Both LEDS can be turned off for
indiscreet radiation monitoring.
BUTTONS & SWITCHES (starting on the face, right edge)A.
POWER Power switch controls the internal 3.7v Lipo battery and
charging of the battery. Up turns on the GC with battery power,
Middle turns OFF the battery power, and Down is for charging the
battery. To charge the battery, POWER switch down, USB power switch
(located at bottom panel) LEFT, then plug in your USB cable to 5v
source. When you do this, a RED LED below the USB port will remain
constant RED while charging, and will turn BLUE when charging is
complete. For normal battery operation, POWER switch up, and USB
power switch to the RIGHT.
B. ALARM This controls the Alarm RED LED and Piezo. Up for both
on, Middle for both off, and Down for LED only on. This makes for a
silent visual alarm. Settings for Alarm threshold is at startup
with the MOD button, or with the wireless remote by pushing the
MENU button then forward or back button to get to that part of the
menu.
C. SOUND This controls the Event speaker. Up for Standard CLICK
mode, Middle for mute, and Down for TONE Mode. More on Tone Mode
later. Please note that at anytime, you can push the mute button on
the wireless remote to mute the event clicking. It is the RED
button located on the top left of the remote.
D. LIGHTS This controls both the GREEN Event LED and the LCD
Backlight. Up turns on both, Middle turns both off, and Down turns
on the LED only, and the Backlight off for power saving.
E. MOD tactile button (located on just below the Display to the
right of the green LED) does 4 things. 1- Alarm control. 2- Scaler
mode start/stop. 3- Alarm 30 second mute. 4- ATmega EPROM reset. 1.
When you first power on the unit, you will see: abyx-GK5 K124
LND7317 v11.1b
This customized first welcome window can easily be changed if
you want, by doing a little programming in Arduino. Refer to the
DIY site for directions at the SOFTWARE section. But the default is
now set to the device name (abyx-GK5), kit number 123, Geiger tube
type LND7317 and the version of software that the AT328 chip is
running which is version 11.1b (the newest). Then a second window
will come up with the first line showing the current set uSv to CPM
conversion rate.
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100 CPM=1 uSv/h
Running at 5.19V
The second line refers to the current voltage that your system
is running at. This is a 5 volt system. The 3400mAh 3.7v lipo
battery is boosted to 5v with a pololu booster. Everytime you start
up your GC (Geiger Counter) it will show you this so you will
always know your current voltage.The third window will show this:
Alarm Set ? Now at 500 CPM At this point, you can push the MODE
button to incrementally change the Alarm threshold number. Once you
stop holding down the button and wait, it will be set to the
current number shown on the screen and will stay there until you
change it either again restarting and waiting for this part, or by
using the included remote control to change it. You can also choose
from units of measurement such as CPM or uSv/h for the Alarm with
the remote. 2. It also acts like a stopwatch starter for the scaler
mode. It has two preset times of 1 minute and 10 minute averaging.
You can change this with the remote, or the sketch when connected
to pc. Although it is much easier with the remote obviously. Push
the button and the timer starts where the first line is counting
down from 60 seconds. The numbers on the left are the current total
events during this timed one minute. The numbers on the right is
the seconds counting down from 60 to 0. Same thing goes for the
second line, but for 10 minutes. 3.When your alarm goes off you can
tap this button to mute the alarm for 30 seconds. 4. After
programming your unit with the wireless remote, if you want to
reset it to default settings. Hold down this button while the unit
starts up.
F. NULL This tactile button (also just below the display to the
left of the RED LED) is used in Tone Mode where clicks are replaced
by a tone which varies in pitch based on the CPM. As it gets closer
to the sample, the pitch rises and as it goes away, so does the
tone. Press NULL and a new baseline is created for the pitch so if
you are moving to an area with a higher background the pitch will
still indicate changes at the new level. You can also increase or
lower the sensitivity in the menu options by increasing the number.
Default is 4, and I usually keep it at 8.
DISPLAY IN DEPTH:
The top line shows the CPM (updated every 5 sec. by default, and
changeable in the MENU options with the remote) and a quick
response bar graph (updated 20 times / sec.). The bargraph will be
replaced with ALARM if the displayed CPM exceeds the alarm
threshold. It is also replaced by Vcc when it drops below 4.2V. The
second line shows the dose unit and the calculated dose. The dose
unit and the dose ratio (CPM to dose unit) are settable in the menu
(controlled by the wireless remote or via arduino). Pressing the
Select button while in this screen will switch to the Scaler screen
. . . Two scalers are provided, each with its own period. The
scaler on the top line is fixed at one minute and the scaler on the
bottom line is set to a programmable period from the menu. Each
scaler has two modes - counting and ongoing. The screen on left
shows both scalers counting. A running total of the counts is
displayed, along with the amount of time left for the scaler
period. The screen on the right shows that the one minute scaler
finished the counting mode and is now showing the average CPM and
dose rate for the period. These values now become a moving average.
The bottom scaler can also be set to Infinity in the menu by
setting it below 2. This is a special mode that shows the total
accumulated dose since the scaler screen was first started.
Pressing the Select button while in the scaler screen will bring
you back to the main screen. However both scalers will still be
accumulating counts, so you can go back and forth between the main
screen and the scaler screen and still see meaningful data.
OTHER SWITCHES, BUTTONS, PORTS, DIALS A. Just to the right of
the LCD is the LCD contrast dial. As the LCD is used, it might get
to a point for you to readjust the contrast for it. Not a big deal,
while the backlight is on, gently take a small screwdriver and turn
it to the left or right until it appears to have the best contrast.
B. Located on the bottom panel, left side is the AUDIO OUTPUT
multi-port used for Geiger Bot (with the included G-Bot cable).
Just plug in the Geiger Bot cable into this with the 3 conductor
plug, and the 4 conductor into your iphone or ipad. It also serves
as a mono audio output for silent listening with headphones, or
with any 3 conductor to 3 conductor M-M audio cable, you can run
sound based data logging software or amplify the clicking. C. Also
on the bottom panel and in the middle is the USB power and charge
control switch. If you want to power the GC with USB and bypass the
batteries- 1. Turn off the GC battery by switching POWER to middle
position. 2. plug in the USB cable, and other end to any 5v source
such as a wall charger, cigarette adapter, pc, mac or laptop usb
output. 3. Flip USB switch to the right and the unit will power on
and not effect the battery. To charge the battery- 1. POWER switch
down to CHARGE position. 2. Plug into USB source. 3. Push USB
switch to the LEFT CHARGE position. When you do this, a RED LED
comes on below the USB port and will remain RED till it is done
charging, then it turns BLUE. During battery powered operation,
keep this switch to the right.
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D. Also on this panel is the USB FTDI output/input port for
programming in Arduino. This also is used to charge the internal
Lithium Ion battery (with the power switch in the bottome
position.) Or it can be used to power the GC for extended periods,
however when you power it this way, I would advise to turn off the
LCD backlight. But its ok to turn it on once in a while, but I
wouldnt leave it on for extended periods. When uploading any new
changes to the program sketch, you will need to have the USB PWR
switch in the RIGHT position whie it is plugged into your pc with
the USB cable. This same USB is used for an output to two different
usb based FREE Radiation Logging softwares. Both are PC based and
not available for mac. More on that later.
REMOTE CONTROL SYSTEMThis adds some conveniences such as the
ability to adjust certain things on the GC without the need to plug
into your PC or mac. It is already setup to work. All you have to
do is point the remote towards the IR window (above the display),
and push the MENU button on the remote to start. As soon as you do
that these options will pop up:
MENU OPTIONSInitially, the menu options are set to defaults.
Settings made will be stored in EEPROM on the ATmega328, so they
will be in effect when youpower back on. Pressing and holding the
Select button at power on will reset all menu settings back to
their default settings. Heres a brief description of each menu
option along with its default setting:
DISP PERIOD (MS) - The number of milliseconds before the display
refreshes. 5000 (5 sec.) is a good setting.(Display counts are
based on a running average I do not recommend settings of less than
5 seconds.)LOG PERIOD - Interval to write the CPM, dose, and MCU
voltage to the serial output. Default = 1 minute Zero means logging
is turned off.CPM->[DOSE] RATIO - Sets that ratio for the type
of GM tube used. Default = 175.43 CPM and 100 CPM to dose unit
(uSv) Note this ratio will depend on the dose unit being displayed
- see DOSE UNIT. Also note that 2 ratios can be stored. The second
ratio can be selected by the Tube Switch. Depending on the position
of the switch this menu option will set the value for either the
1st or 2nd ratio. 175.43 is the common default for the SBM-20 and
100 for the LDN 712. The DEC PNT or AV/TV key on the remote can be
used to enter a decimal point.ALARM THRESHOLD - When the CPM or
DOSE units is greater than this value the alarm is triggered.
Default = 500 CPM This can be either inCPM or the dose unit
selected see ALARM UNIT. Zero means the alarm is turned off. Unlike
using the Select button, any value may be entered. The alarm will
stop when activity drops back under the alarm threshold. You can
also silence the alarm for 30 seconds by pressing the Select button
when the alarm is sounding.DOSE UNIT - Use the arrow keys to select
the name of the unit for the dose value - uSv/h, uR/h or mR/h.
Default = uSv/hALARM UNIT - Sets whether the alarm is based off of
CPM or the DOSE unit. Use the arrow keys to select. Default =
CPMSCALER PER (MIN) - Sets the period for the second scaler.
Default = 10 minutes If scaler period set to Infinite (setting
below 2) , the accumulated dose rate is displayed on the scaler
screen.BARGRAPH MAX CPM - Sets the CPM that will give a full scale
reading on the bar graph. Default = 1000 CPM Also see the Tone Mode
sectionfor how this option affects tone mode.TONE SENSITIVITY -
Determines how sensitive the tone is to changing activity. Default
= 4 Low numbers are more sensitive. (see below)USE RADLOGGER? -
When Yes serial output is compatible with Radiation Logger and
RadLog applications. Default = OFFREG. VOLTAGE - Displays the
voltage powering the MCU (Vcc). To a large degree, this represents
the state of the battery.Note that each menu setting has a minimum
and a maximum setting. Entries that are out of bounds will revert
to the minimum or maximum.
Function of Keys on the RemoteThe functions for the various keys
on the remote are as follows:
Enters menu system. The current selection is highlighted and the
selections before and after are shown. Pressingthe Menu key while
in the menus exits them.Moves down to the next menu option, or up
to the previous menu option.>> Increments the value already
set for the current option or toggle the option. after using
digits.Enters a decimal point when setting CPM->(unit). If C is
used when out of the menu - it will clear the graph data ifon the
main screen and clear the scaler counts if in the scaler
screen.(Mute) Silence the speaker - used when out of the
menu.(Select) Switches between the main screen and scaler screen -
used when out of the menu.Switches between the main screen and the
Info screen - used when out of the menu.Any other key if in the
menu system the key code for unknown keys will display.
ABOUT DOSE UNITSThe menu allows you select the name of the dose
unit that appears on the display. However, to be clear, there is no
built in conversion betweenthem. Instead the CPM->(unit) is
adjusted depending on the name of the DOSE UNIT selected. For
example, 175.43 is the default set for theSBM-20 with uSv as the
dose unit. Suppose you pick mR as the dose unit name, and want to
measure in milirems. (mR more correctly abbreviates as
milliroentgens but is used to save display space.) The rem is
defined as .01 seivert, and 1uSv = 0.1mR. Therefore, to use the
same ratio that was designed for the tube, you would multiply that
ratio by 10. You would enter a CPM->(unit) as 175.43 x 10 or
1754.3. Likewise if you wanted microrems (uR) you would divide the
ratio by 10 and enter 17.54. If you do want to use roentgens
(exposure - used in older instruments) this source states that they
are .96 rem in soft tissue. So the CPM- >(unit) for actual mR
would be 175.43 x 10 x .96 or 1684.1. (for uR it would be
16.84)
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TONE MODEInstead 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 inpitch is much more noticeable
than a change in the rate of clicks. It was primarily designed for
field surveying. The sensitivity of the tone mode isset by the TONE
SENSITIVITY menu option. Sensitivity refers to the bandwidth of the
tone. When set to low numbers, say 4 (the default) only asmall
increase in activity is needed to produce higher tones. When
dealing with more sensitive GM tubes, decrease the sensitivity by
using avalue of say 8 or 10. Experiment with values that suit your
ear. 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.
SETTING UP TONE MODE 1. Set the proper conversion ratio for your
tube. With the proper ratio set, the null point will automatically
be set when the counter is powered on so normal background
radiation is ignored. 2. Place a sample of the mineral or other
radioactive item you are trying to detect approximately one inch
from the detector. Note the CPM reading after it has stabilized. 3.
In the menu, set the BARGRAPH MAX CPM to the CPM value you noted in
step 2. 4. Adjust the tone sensitivity setting to suit your
preferences. For most mildly radioactive items (such as red
Fiestaware), sensitivity settings from 1-5 work well. The ideal
value varies depending on the activity level of the target object,
the tube, and the distance. Lower settings cause the tone to
increase in frequency faster in response to smaller changes in the
count rate. Higher settings cause the frequency to increase much
more slowly for changes in count rate. When the sensitivity setting
is 0, the frequency will jump very rapidly from the lowest
frequency tothe highest one. This setting is useful to quickly scan
an area to determine if there are hot spots. You will likely want
to change the setting to ahigher number to help locate the hot
spot.
DATA LOGGINGLogging is provided in the form of serial output
through the FTDI connector at 9600 baud, N,8,1. The frequency to
send the serial output is determined by the LOG PERIOD menu
setting. The default format has a header on the first line with
each line of data in comma separated values for CPM, Dose. and Vcc.
For example, 36,0.2052,4.79 (36 CPM, 0.2052 dose, 4.79V) When USE
RADLOGGER? is YES, no header is created, and only CPM is output.
This setting is used when connecting the serial output to the
Radiation Logger application.
RADIATION LOGGERThis may be the simplest application to
interface to and provides some very nice features. Its a Windows
freeware application available on thissite. It was originally
intended to work with a clone of the Geiger kit sold there.
Beginning with v10.1 the Geiger kit can interface to this
applicationby setting a menu option USE RADLOGGER? to Yes and
setting LOG PERIOD to either 5 or 10 seconds. The application
expects only CPMfrom the serial port in either 5 or 10 second
intervals and combines it with the local time. Setup the parameters
on the logging application by selecting the comm port and the baud
- 9600. It does a great job logging and graphing. Logs can be saved
and graphed at a later time. It may bethe best logging and graphing
application Ive run into. All that is needed to use it with the kit
is v10.1+ software and a USB to serial dongle.
RADMON.ORGThis is a very unique approach that maps and graphs
the output collected at the PC to a web site. This allows you to
compare your readings with others around the globe. It is very easy
to get this working with the kit . . . Register and download the
application from radmon.org. Set the menu options on the kit to:
USE RADLOGGER? = Yes and set LOG PERIOD to at least 30 seconds.
(Unlike the Radiation Logger above, you can set longer periods if
you wish.) Run the application you downloaded, set the comm port to
your FTDI cable, the baud to 9600, and enter the username and
password you registered with. You will also see the kits output on
your PC and also on the radmon.org website.
SOFTWARE SWITCHESIf you are willing to load the software, modify
it, and upload it, you can set #defines to change certain behavior
or add special features to the program. In general all the common
features are enabled and you dont have to mess with it. But if, for
example, you want to use a 2x8 LCD, you simply change a #define,
and upload the new release.
All user based #defines are located at the beginning of the
sketch and may change based on the version. Below is a list of the
most interesting defines in the current version. EIGHT_CHAR -
formats for 2x8 LCD when true DOGM_LCD -DogM LCD used for display
(SPI interface) IR_RC5 - use Phillips RC5 IR protocol instead of
Sony ANALOG_METER - support for analog meter output - REQUIRES
HARDWARE - see this project TONE_POT_ADJ if set, a 100k pot can be
used to set TONE SENSITIVITY instead of the menu option. SELF_TEST
- adds one to each counter every 167ms - simulates a ~360CPM
countThere are step by step instructions on installing the Arduino
IDE and uploading new software.
ARDUINO SETTINGS: Brohogan Software system version 11.1B1. Open
Arduino2. Open the saved sketch .ino file, connect your Geiger
counter to the USB with power switch off.3. Verify the file by
clicking the little check mark icon.4. Click TOOLS, and Select
Board type as Arduino UNO, and select serial port as the top tty
choice.5. Click Serial Monitor (top right looking glass icon). Set
Baud rate to 9600 and you should see the CPM, uSv and geiger
counter voltage data coming up once per minute.
For more info go to website under Software section on the DIY
geiger counter website. Or go to Arduino.cc
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ARDUINO Software and Serial-USB connection information On the cd
you will find the FTDI driver and Arduino program version, however
you may want to go online and check if this is the latest or the
right one for your computer or mac 1. Install both and restart your
mac. Copy the Geiger Sketch folder to the same folder as your
Arduino program is and remember where that is as that will be where
you go to save your sketch everytime you make a change to it. There
will also be a Library folder that will also need to be in the same
folder. Just remember that the folder has to be the same exact name
as the sketch name is. And also within Arduino, you will have to go
to preferences and show Arduino where your default sketch folder
is.
GEIGER BOT SUGGESTED SETTINGS: (You will have to play with it to
get it just right) GO TO:
https://sites.google.com/site/geigerbot/
POWER and OTHER SYSTEM ITEMSThis system is capable of producing
900+ volts, so be careful or you may get zapped when handling the
system while it is powered on.A. Lithium Ion battery - 3.7v 4000mAh
Full charge provides approximately 25 hours constant use of geiger
counter with backlight off. Charge with PC/USB will take about 5
hours or more.B. USB Lithium Polymer battery chargerC. Pololu 5V
Step-Up Voltage Regulator U1V10F5
http://www.pololu.com/product/2564D. Sparkfun 5V FTDI Basic
BreakoutE. You can power the Geiger in a few different ways 1. With
internal Lipo battery 2. With POWER switch OFF (middle), USB SWITCH
to RIGHT, USB cable plugged into USB port then plugged into: a.
Computer or laptop USB b. Wall charger block- This is the fastest
way to charge the battery. c. Standard 5v USB Cigarette adapter d.
To power and operate the unit this way for long periods, I would
suggest to TURN OFF BACKLIGHT to conserve the life of the LCD.
HARDWARE1. DIY Geiger counter kit GK-v5.4 by Brohogan, Running
operating system v11.1b2. Takachi Enclosure with fitted silicone
boot LCS165H - N3. Pelican Case 10604. LND7317 Geiger Muller
Tube
LND7317 ELECTRICAL SPECIFICATIONSRECOMMENDED ANODE RESISTOR (MEG
OHM) 4.7MAXIMUM STARTING VOLTAGE (VOLTS) 425RECOMMENDED OPERATING
VOLTAGE (VOLTS) 500OPERATING VOLTAGE RANGE (VOLTS) 475 - 675MAXIMUM
PLATEAU SLOPE (%/100 VOLTS) 10MINIMUM DEAD TIME (MICRO SEC) 40GAMMA
SENSITIVITY CO60 (CPS/MR/HR) 60TUBE CAPACITANCE (PF) 3WEIGHT
(GRAMS) 125MAXIMUM BACKGROUND SHIELDED 50MM PB + 3MM AL (CPM)
30MINIMUM ANODE RESISTOR (MEG OHM) 3.3REPAIRSIf the unit fails for
some reason within 6 months of purchase, I will be more than happy
to do any maintenance you need at no charge except forparts and
shipping.
PACKAGE CONTENTS In your package you will find:Geiger Counter,
Pelican 1060 case, Lead Pig w/ Sample, CC Remote Control, (2)
Cables: Geiger bot 3 to 4 conductor, Mini USB to standard USB2. CD
with program sketch, photos, documents, Manual, RAD sticker, and
extra faceplate labels.
PLEASE REFER TO THE DIY GEIGER COUNTER DEVELOPERS WEBSITE FOR
FURTHER
INFORMATION:http://www.sites.google.com/site/diygeigercounter/
FREE WALL AND CAR CHARGERS & UV keychain flashlight with
batteries while supplies last.
THE GEIGER KIT IS NOT INTENDED TO GUIDE ACTIONS TO TAKE, OR NOT
TO TAKE, REGARDING EXPOSURE TO RADIATION.THE GEIGER KIT AND ITS
SOFTWARE ARE FOR EDUCATIONAL PURPOSES ONLY.
DO NOT RELY ON THEM IN HAZARDOUS SITUATIONS!
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