2013 m. lapkričio 17 d., sekmadienis

Version 10.2. adaptation for the LCD shield (v.10.2.1)


v.10.1.2 - adaptation modifications are listed below:

PIN definitions are adapted to work with LCD shield as follows:

#define BUTTON_PIN           11  (in v.10.1 was 10)
#define ALARM_PIN             10  (in v.10.1 was 15)
#define NULL_BTN_PIN       15  (in v.10.1 was 11)

 simplified serial port output to work with freeware Radiation Logger software by radiohobbystore:
 is now configured to be the default output changable back by menu (note: use of menu needs connection of IR receiver)

If you want CPM, [dose unit], Vcc to be the set as output format during the RESET_ALL (i.e. when the #define RESET_ALL true) find and change the line in Menu from:
writeParam(true,RADLOGGER_ADDR); 
back to:
writeParam(false,RADLOGGER_ADDR);


The modified sketch can be downloaded here: https://www.dropbox.com/s/od831jqjbnw4x41/GeigerKit_v10_2_1.zip

2013 m. lapkričio 1 d., penktadienis

Modification of the counter to have HV programmable by IR TV remote


This is a modification of  the DIY Geiger counter to have HV programmable with IR TV remote control. This version assumes two voltages 400V and 500V - for most popular russian and western made Geiger-Müller tubes.

This modification in essence is substitution of the generator on 555CMOS timer chip with a signal generated by the ATMEGA328 timer.






2013 m. spalio 18 d., penktadienis

Use of the IMEX-38-56 High Voltage generator - iPhone Geiger Counter (Geiger Bot app)


Here below I publish shematics and video of the working prototype of the iPhone connect-able Geiger Counter which works with iPhone (Geiger bot app)




The high voltage generator seen in the video above is on eBay - item number 161121230169
The link is http://www.ebay.com/itm/161121230169



(note transistor here is 2N3904 but any similar/popular NPN type would do either)


The whole schematics runs on 2xCR2025 3V batteries (6V). Batteries theoretically should last more than a year as theaverage power consumption is something around 10uA(10^-6A).

In the video it works with GeigerBot https://sites.google.com/site/geigerbot/
which is freely downloadable from appstore
http://itunes.apple.com/ml/app/geiger-bot/id427728355?mt=8

Dimensions of the prototype board you see here are:
43mm/63mm/13mm




Simply shorting 5V regulator input with output without disconnecting the third terminal from ground => wasting battery power

I have observed that if you do not need the the 78L05 5V regulator, shorting between its input and output without disconnecting its third terminal from ground would waste your battery power even more than if you use the regulator in the usual way.


2013 m. birželio 9 d., sekmadienis

How to simply add the 38kHz iR receiver to the yet unassembled LCD shield PCB (i.e. where the LCD is not yet mounted and soldered on)


 To add the 38kHz iR receiver TSOP 4838 (you can search it on eBay using keyword TSOP4838),
you need to: 

form legs of the receiver leaving 5 milimeters and solder it exactly as shown in the below picture. Note that it should be soldered on the bottom side of the PCB;


 

- insert headers exactly as shown in the picture on the picture below;



-place the LCD shield PCB on headers, scratch the protective paint as shown in the picture on the bottom and solder the headers;



- the bottom side should look like in the picture below.



As shown in the below picture:
- connect the edge-most pad with the power supply pad using a piece of isolated wire - connect the next pad with the scratched area using excess solder or with a short piece of unisolated (you can use cut-off pins of components left after assembly of the main PCB);
 - connect two remaining pads using a short piece of unisolated wire. Take care that there is no contact between these pads and a ground plain.


Install the rest of the components (LCD display should be installed the last).





How to simply add the 38kHz iR receiver to the already assembled LCD shield (i.e. where the LCD is already mounted and soldered on)


To add the 38kHz iR receiver TSOP 4838 (you can search it on eBay using keyword TSOP4838),
you need to:
- bend the VCC and GND pins and cut the Output pin leaving approximately 5 mm;
-  install the device as shown in the below picture (note that it should be installed on the bottom side of PCB and in the orientation shown on the picture) and solder it in; 
-  take the one pin straight header, remove the plastic part off and solder it in just in front of output pin (solder on the bottom side of the PCB). Solder the output pin to the one-pin header;
- connect the VCC pin with the leg of the contrast potentiometer as shown on the picture using isolated piece of wire);
- scratch the protective paint OFF and solder in the wire bridge as show  in the picture.

Now you can upload version 10.1.1 of the software and use the Sony type remote to control the menu.

Click on the picture to enlarge


D.I.Y. geiger counter with v.10.1.1 with iR remote controllable menu




D.I.Y. geiger counter with v.10.1.1 with iR remote controllable menu.
menu can be controlled with a Sony type TV remote control.
optionally it is possible to change settings to Philips remote system.
Also any universal or multisystem iR TV remote, which can emulate Sony
or Philips systems can be used.



the biggest advantage of the menu system is, that parameter changes (such as changing CPM to uSv ratio for another tube) can be done without connecting the device to computer and no reprogramming is necessary.



2013 m. birželio 5 d., trečiadienis

Version 10.1. adaptation for the LCD shield (v.10.1.1)



 v.10.1.1 - adaptation modifications are listed below:
PIN definitions are adapted to work with LCD shield as follows:
#define BUTTON_PIN        11  (in v.10.1 was 10)
#define ALARM_PIN         10  (in v.10.1 was 15)
#define NULL_BTN_PIN      15  (in v.10.1 was 11)

 simplified serial port output to work with freeware Radiation Logger software by radiohobbystore:
 is now configured to be the default output changable back by menu (note: use of menu needs connection of IR receiver)
 If you want CPM, [dose unit], Vcc to be the set as output format during the RESET_ALL (i.e. when the #define RESET_ALL true) find and change the line in Menu from:
 writeParam(true,RADLOGGER_ADDR); 
 back to:
 writeParam(false,RADLOGGER_ADDR);


The modified sketch can be downloaded here
Libraries can be downloaded from here

2013 m. gegužės 27 d., pirmadienis

Logging software modification for brohogans logging shield (output to work with Radiation Logger software by radiohobbystore and changes related to switching between displays)



Ver.8.01 - modifications listed below:
simplified serial port output to work with freeware Radiation Logger software by radiohobbystore:
https://www.dropbox.com/s/n3fxplfw26os22o/Radiation_Logger_1.01.zip
https://www.dropbox.com/s/15zuby5t65bwd0m/Radiation%20Logger%20User%20Manual.pdf
Swithing DIP switch #1 (D4) on: starts "dose mode" and keeps it displayed until the switch is not turned off (meaning no alternating displays - either immediate measurement display or running averages).
During the first minute, while the average for that minute is being calculated, uSv value is substituted with a word "wait".

The modified sketch can be downloaded here
Libraries can be downloaded from here

2013 m. gegužės 14 d., antradienis

Adjustable HV high voltage supply module for geiger tube counter and dosimeter

IMEX-38-56-1 is an adjustable high voltage generator module for Geiger-Müller 
tubes. 
The module is for use in geiger counters and dosimeters where portability,
small size, very low power consumption and stability is required. 

Specifications:

Supply voltage range: 2.5-5.5V  
High voltage range:   380 to 560V (adjustable with a 24 turn trimmer
potentiometer). Practically all popular western and russian-made Geiger-Müller
tubes are supported. Current limiting 4M7 resistor is already installed (for most
Geiger-Müller tubes of russian origin). Additional separate 0.125W 4.7M resistor
is provided with the module for tubes of western origin.

Low quiescent (standby) current:  0.5-10μA  

Low ripple: 1 to 5V

Working temperatures: -20 to +60ºС

Three pin module: pin 1 HV, pin 2 GND, pin3 positive input voltage

Dimensions: 38.5mm x 7mm x 25mm

Module is encapsulated for isolation purpose in transparent epoxy.

You can obtain this device on eBay - please check THIS eBay LINK .
Alternatively please contact me by e-mail: