Search found 1000 matches

by mightyohm
Mon Jun 10, 2019 3:40 pm
Forum: Geiger Counter
Topic: updated software, add-on display
Replies: 2
Views: 147

Re: updated software, add-on display

flipflip -

Wow, that display is really cool! Thanks for sharing.

I'll see if I can fix the attachment settings, sorry about that!
by mightyohm
Mon Jun 10, 2019 3:22 pm
Forum: Geiger Counter
Topic: range of geiger counter
Replies: 7
Views: 273

Re: range of geiger counter

Again, it is very hard to say because it depends on the nature of the radiation, the difficulty of interpreting the results, and what is considered "safe". It would be very difficult to use the kit safely in an area with that level of radiation. The kit is not intended to be used for this ...
by mightyohm
Thu May 30, 2019 9:18 am
Forum: Geiger Counter
Topic: range of geiger counter
Replies: 7
Views: 273

Re: range of geiger counter

The intensity of radiation measured at a distance from a radioactive source falls with the square of the distance from the source. This is called the inverse square law: https://www.nde-ed.org/GeneralResources/Formula/RTFormula/InverseSquare/InverseSquareLaw.htm A really powerful source will be meas...
by mightyohm
Tue May 28, 2019 8:22 pm
Forum: Geiger Counter
Topic: range of geiger counter
Replies: 7
Views: 273

Re: range of geiger counter

That’s a difficult question to answer as it depends on the source you are trying to measure. Can you provide more details?
by mightyohm
Tue May 28, 2019 12:48 pm
Forum: Geiger Counter
Topic: range of geiger counter
Replies: 7
Views: 273

Re: range of geiger counter

It will depend on the tube you decide to use. The datasheet for the SBM-20 is here:

https://www.gstube.com/data/2398/

It shows 0.014 - 144 mR/hr but I haven't verified this.
by mightyohm
Mon May 13, 2019 10:57 am
Forum: Geiger Counter
Topic: Serial Console giving scrambled output like "IKL\0xe9\0xd4!/%\0xa39!%" - SOLVED
Replies: 3
Views: 329

Re: Serial Console giving scrambled output like "IKL\0xe9\0xd4!/%\0xa39!%"

Sorry I couldn’t reply sooner. Glad you got it working. Any idea why your other usb serial adapters aren’t working?
by mightyohm
Tue Apr 23, 2019 9:24 am
Forum: Geiger Counter
Topic: How does he INST mode work?
Replies: 1
Views: 337

Re: How does he INST mode work?

INST mode reports counts per minute based on taking the number of counts over the last second and multiplying by 60. Unlike the other modes, there is no averaging of counts over multiple seconds.
by mightyohm
Thu Apr 11, 2019 1:42 pm
Forum: Geiger Counter
Topic: Programming the ATTiny2313
Replies: 1
Views: 647

Re: Programming the ATTiny2313

The source code is not compatible with Arduino. You'll need avr-gcc (WinAVR is no longer being actively developed but last time I checked I was still able to download and install it) and an AVR programmer like the USBTinyISP. Windows 10 may have some problems with drivers, since WinAVR is quite old ...
by mightyohm
Fri Mar 29, 2019 3:30 pm
Forum: Geiger Counter
Topic: Mightyohm Geiger counter online (via serial com port)
Replies: 7
Views: 13762

Re: Mightyohm Geiger counter online (via serial com port)

Bob,

Sorry I can't help you, I'm not familiar with rrdtool either.
by mightyohm
Mon Mar 11, 2019 8:44 am
Forum: Geiger Counter
Topic: Sensitivity Adjustment
Replies: 8
Views: 2264

Re: Sensitivity Adjustment

Now I understand what you are trying to do. Geiger tubes aren't designed to work in this way, but you can try reducing the voltage to the tube - at some point the sensitivity will start to drop off. You can try adjusting VR1, but most likely you'll have to increase R8 as well. You could replace R8 w...