For anyone using this board. The interrupt output is R19 - 470K impedance so you can safely connect it directly to an interrupt pin on ANY microprocessor. Inputs on an Arduino or espxxxx have clamp diodes to prevent above supply or below ground, but they can only deal with a small current. The 470K guarantees its a tiny current and that is exactly what its designed for. There is generally virtually no tube current until there is an avalanche caused by a particle, this has to flow through the base of the transistor and is always enough to produce a pulse. The transistor and stray capacitance is sufficient to ensure that you don't get noisy triggers even with the fastest interrupt. If you are worried about that you can deal with that in software based on the fact that the tube itself can only handle a certain number of pulses in a given period. Or you could use a schmitt trigger or 555, but there already is a 555doing exactly that on this board, you can grab the signal from Q4. The tube itself in this simple design works really well and is sensitive enough to detect atmospheric changes during rain or day and night cycles. It doesn't pick up alpha particles which can't get through the glass. I tested mine with Americium which emits alpha but then decays with gamma which is what it sees and the detector goes bonkers near thorium soaked lamp mantle you can get from eBay. It goes well above 2000 - 5000 counts. Finally, yes the tube is 400V but the impedance of the tube driver is insanely high which means that even a volt meter pulls it down to a few volts so no shock hazard at all, you can even lick it. In fact that bunch of resistors is to create a mega high impedance divider just so you can get a volt reading of a few volts to give you some idea what the actual tube is, because you cannot measure it directly, even with 10M Ohm voltmeter.

@1nformatica

2 жыл бұрын

Thanks for sharing your extensive knowledge. That will helps others with similar projects. Thanks for watching, have a great day!

Great video :) I actually built the circuit that you showed and also copied your code for my own project. I was playing around with the output and noticed that the arduino actually does a good job at recognizing the signal even without the 555 timer circuit! I just plugged the "VIN" from the geiger counter directly into pin 2 of my arduino board, and the onboard LED lights up equally well. Anyways, despite this I feel like I learned a lot from your video! Thank you!

@1nformatica

3 жыл бұрын

Yes, it will work without the 555, I was concerned that the "unsquared" waveform may cause false readings. Thanks for the comment. Please consider subscribing if you have not done so already!

What a brilliant bit of history there, I never knew of the plane crash in spain, Cant wait to see you testing this in the field :-)

@1nformatica

7 жыл бұрын

Yes, should be fun, now where's my nuke suit?!

Excellent project. I suggest to use a 220 ohm resistor in the 555 to reach the same pulse width that have the DIY module (~227 microseconds width). I think that if you use a 1k resistor, and a pulse width of 1ms, you are trimming the maximun CPM that you can measure

@1nformatica

3 жыл бұрын

Thanks for the tip. Please consider subscribing if you have not done so already!

Very informative.

@1nformatica

6 жыл бұрын

Hey thanks! Part of the Palomares site is now a golf resort! I wonder how many of them know the history of what's under their feet. I would ask but I'm not a member!!

Thank You.

Intresting and informative and intresting matte matic

@1nformatica

4 жыл бұрын

You're welcome! Please consider subscribing if you haven't done so already!!

Fantastic work, man. And great project! Would be nice to have radioactive samples to test and see how acute it is. :)

@1nformatica

7 жыл бұрын

In a following video I will be doing that and hopefully comparing the results with a commercial unit.

@MCsCreations

7 жыл бұрын

1nformatica Great! :)

@BedsitBob

6 жыл бұрын

"Would be nice to have radioactive samples to test and see how acute it is. :)" A luminous watch face will do.

Firstly, tanks for the informative video. Did you know the Arduino has an internal comparator that could save you the external 555?

@1nformatica

2 жыл бұрын

Hey thanks! Do you have a link to more info on the comparator function?

Like you discription, have a same one, quite satisfide with it.

@1nformatica

3 жыл бұрын

Hey thanks! What do you use yours for? Please consider subscribing if you have not done so already!

@kajmolin297

3 жыл бұрын

@@1nformatica Ihave´t use it yet, but thiking on backgroud radiotion, and a data logger for example, and a Arouno Due.

@1nformatica

3 жыл бұрын

@@kajmolin297 Excellent! Good luck with your project.

@kajmolin297

3 жыл бұрын

@@1nformatica thanks a lott!

What does the test J4 bridge connector and the trimmer resistor R100?

@1nformatica

5 жыл бұрын

The circuit diagram and instructions can be found here : drive.google.com/drive/u/0/folders/0B9itH-BnWE5sY2JGRkM4MWhSYkE The R100 is used to calibrate the unit. J4 disconnects the 400v from the tube for testing.

Hi Sorry, another question, what's the voltage that you used for the Muller tube? I cant find any description on internet about it . Many thanks

@1nformatica

4 жыл бұрын

It is around 400 volts. There is a schematic here : github.com/SensorsIot/Geiger-Counter-RadiationD-v1.1-CAJOE-/blob/master/Geiger%20Counter%20Diagram.pdf I guess you know there is a second part to this project : kzread.info/dash/bejne/dYSLmaWLda7RddI.html A good general description using a different board here : www.cooking-hacks.com/documentation/tutorials/geiger-counter-radiation-sensor-board-arduino-raspberry-pi-tutorial/

@alfiolocatelli5093

4 жыл бұрын

@@1nformatica got It thanks! There Is only One problem. If i screw the trimmer on the higher volt , i can reach a maximum of 290 V... So that's too low. How to fix?

@1nformatica

4 жыл бұрын

To measure this high voltage you need a very high impedance meter as the current is very low. A "normal" multimeter will not give an accurate result as it loads the circuit too much.

@alfiolocatelli5093

4 жыл бұрын

@@1nformatica ohh! Nice to know. So, what i measure with my multimeter (290V) Is about 400V right?

@1nformatica

4 жыл бұрын

Probably, but the only way to know is with a special high voltage tester. Maybe a local college or university may have one.

It has 2x555 ic would it's not make more sense to tweak the setting on the output 555ic

@1nformatica

2 ай бұрын

Each to his own! I just went with the solution I knew. Thanks for watching, have a great day!

Good job! Maybe Is there any possibility to ready Sv/h from Arduino? Otherwise trought some analog signal from board?

@1nformatica

5 жыл бұрын

I do not really understand what you are asking.The detector board just outputs a pulse when a particle is detected. The Arduino does the calculation from counts per minute to Sv/h.

@alfiolocatelli5093

5 жыл бұрын

@@1nformatica i cant see the calculation from counts to SV/h. In Arduino there Is Just the counts...no?

@1nformatica

5 жыл бұрын

@@alfiolocatelli5093 It is in the second video : kzread.info/dash/bejne/dYSLmaWLda7RddI.html

@alfiolocatelli5093

5 жыл бұрын

@@1nformatica Sorry didnt notice that, thanks!

@1nformatica

5 жыл бұрын

No problem. Let me know if you have any other questions.

I didn't understand why the arduino can't measure the signal without the 555 timer ... can you please explain to me ?? i think you could just replace the trigger from the interapt from rising to falling.

@1nformatica

4 жыл бұрын

The original signal could have caused false triggering and readings. The 555 is possibly not really needed but I prefer to see a nice clean signal!

@patriarxiss

4 жыл бұрын

@@1nformatica οκ! thanks a lot!

Your father has really good handwriting

@1nformatica

3 жыл бұрын

Thanks! Sadly he is no longer with us. He was schooled in the naval college and had a good education. He was in the Royal Marines as a gunner on HMNZS Achilles at the time. He was also a bandsman playing Violin, Clarinet and Saxophone. Please consider subscribing if you have not done so already!

Actually, according to its creator, the 555 timer name was actually sequential. So the fact there are 3 5k resistors is just a coincidence! Though I’m not sure if I believe it...

@1nformatica

5 жыл бұрын

One can expect an agreement between philosophers sooner than between clocks!!

From the schematic R-100 evidently adjusts the HV. I have two assembled units WITH display on order, (~60 bucks Walmart), and have also ordered two LND-712 tubes. These LND-712 tubes like a high voltage of ~ 500 volts and I'm asking the best way to measure the HV. I would think to first remove the J-4 test jumper and measure HOW???? My Fluke 179 has a noted > 10 Meg ohms input impedance measuring DC and from what I've read, even this resistance will load the HV supply. A 300 buck HV probe is out of the question and any ideas on adjusting the high voltage to ~ 500 volts will be appreciated.... Thanks P.S. What is the typical highest CPM this GC can display? Thanks again

@1nformatica

2 жыл бұрын

You can find the voltage setting method here : github.com/SensorsIot/Geiger-Counter-RadiationD-v1.1-CAJOE-/blob/master/En_Calibration_GMv1.1.pdf The board itself does not count, it only detects pulses from the tube and outputs a digital pulse which can be counted as I show. Idon't think the board has a practical limit on the CPM. Thanks for watching, have a great day!

@ainttakenanyshit

2 жыл бұрын

@@1nformatica Where the confusion comes in is where ALL the pictures related to the display are showing a count of 24 CPM and can you say that the board/display will show several thousand CPM counts at least and can you tell me what the typical highest count the display will/can read from the board's output? Thanks again .

@1nformatica

2 жыл бұрын

@@ainttakenanyshit Indeed there is confusion here! Perhaps we are not talking about the same board. Please post a link to the one you have. This board ONLY detects particles and outputs one pulse each time. It does not count anything itself nor can it drive a "display". In the second video I show how to connect this board to an Arduino board to count and display the CPM kzread.info/dash/bejne/dYSLmaWLda7RddI.html

About the history, really amazing. Humans are a bit crazy for my taste to use those kind of weapons...

@1nformatica

7 жыл бұрын

Agreed! A quote from my father's diary after his first visit to Nagasaki, "I only hope to God the powers that be will keep this atomic energy secret, else it is all up for us, then I think I'll get me a very small island in the ocean somewhere or other and forget the rest of the world".

@MCsCreations

7 жыл бұрын

1nformatica Yeah... I can imagine! To see it in first hand like that shouldn't be an easy thing...

@1nformatica

7 жыл бұрын

Friday Nov 23 1945 "This morning I went on a lorry round the remains of Nagasaki after the atom bomb had been dropped. There is nothing I can say to describe it, I thought I had seen some bomb damage, but it seems I hadn't. Our ride lasted only about 20 minutes and during that time there was hardly a thing left standing. It was fortunate for the outlying inhabitants that Nagasaki itself lies in a valley with hills on every side else all the outlying districts would have gone too, as it was, all the trees which had been growing on the hillside had all the green stripped from them with just the distorted trunks remaining."

@MCsCreations

7 жыл бұрын

1nformatica Really amazing... In a creepy way...

@1nformatica

7 жыл бұрын

On the map of Palomares in the video you can see in the corner the bomb from the B52 was 1.5 Megatons, 75 times the Hiroshima bomb.......and there were 4 of them!!

Good project. Anyone know what the chips are? They have been buffed off on my BanGGood Geiger kit. Stupid, as they are in sockets for easy replacement. Thanks.

@1nformatica

2 жыл бұрын

There are 2 NE555 timers and an LM358 Op Amp. There is an approximate circuit diagram here : drive.google.com/file/d/1l8TuQgZiDeYuhiSFNRPBbLaZncGen0ZS/view?usp=sharing Thanks for watching, have a great day!

@Night09Owl

2 жыл бұрын

@@1nformatica Wow, that was a quick reply, thanks. i presume the left ic is the lm358?

@1nformatica

2 жыл бұрын

@@Night09Owl Yes, bottom left in this clip next to the radiation symbol : kzread.info/dash/bejne/Zoil0ZV7aZvAl7A.html Thanks for watching, have a great day!

wouldn't a schmitt trigger be simplier or is there a reason why you wouldn't?

@1nformatica

5 жыл бұрын

No reason not to, it's just I am more familiar with the NE555.

@seamonkeys12y

5 жыл бұрын

Fair enough. Good video btw

@1nformatica

5 жыл бұрын

Thanks! Hope you have subscribed for more!!

@gblargg

5 жыл бұрын

The AVR can probably handle the raw pulse just fine anyway. Even if there was multiple triggering on the edge, the interrupt handling time would effectively debounce it.

@perkunast9680

4 жыл бұрын

@@gblargg I agree, Ive got push button switches, that are far worse. A simple debounce code and your done. Why complicate things when you don't need to.

The diary is quite interesting. Is it available for public to read?

@1nformatica

2 жыл бұрын

I started to transcribe it but felt it would be of little interest. You can read a few pages here : drive.google.com/file/d/12jH5X_QYCqFOPHqKH60fW1DSHYVP4nuM/view?usp=sharing If you think it is worth continuing let me know! Thanks for watching, have a great day!

@yannis486

2 жыл бұрын

@@1nformatica it is definitely worth reading. Please, continue transcribing if you have any spare time.

@1nformatica

2 жыл бұрын

@@yannis486 OK, thanks for the encouragement. May I ask what your interest is? There is a good book called "The Forgotten Fleet" I guess you know it : kzread.info/dash/bejne/mIVmya6uaNbTp6w.html

@yannis486

2 жыл бұрын

@@1nformatica I'm not too much into history, but I prefer reading about historical events from non official sources. Also diaries show real life conditions, imo.

can this be used on a smartphone instead your display

@1nformatica

3 жыл бұрын

It would need some work to add a Bluetooth module and send the data to an app.

I tried to repeat this scheme but it does not work. As I understand 555 timer start if on input we have 1/3 from Vcc. Signal should be +1.6V. But we have -3.6V on input. I do not understand how it works on video.

@1nformatica

5 жыл бұрын

The output from the Geiger counter is a pulse from around +3 volts : kzread.info/dash/bejne/Zoil0ZV7aZvAl7A.html If you are seeing -3.6 volts something is wrong with your board or connection.

@bogdanredko9231

5 жыл бұрын

@@1nformatica Thanks for your answer. I have this on output my Geiger Counter. As I see it has -3.6V. Looks like in your video. But as I understand it should be > +1.6V. prnt.sc/olivln

Think I may have asked before? Any information LOST IN SPACE ! The space between my ears ? Is there any rudimentary Display sketch to be had on this project.. Received my BanGGood Geiger kit today and really would like a simple count display.

@1nformatica

4 жыл бұрын

There are a number of project examples on Github : github.com/search?q=cajoe

@pulesjet

4 жыл бұрын

@@1nformatica Going with this one just to get chit working. LOL github.com/RuzgarErik/I2Cgeiger/blob/master/I2C_GEIGER.ino

@pulesjet

4 жыл бұрын

Did you ever get around to part II ?

@1nformatica

4 жыл бұрын

@@pulesjet Part 2 is here : kzread.info/dash/bejne/dYSLmaWLda7RddI.html

I saw a similar method on how to measure the high voltage on a Geiger counter. My Fluke 179 has an input impedance of around 10 Mohms. I used a high voltage, 1000Mohm resistor made by Ohmite. I just connected the RESISTOR IN SERIES with the + probe and using alligator jumpers, made the HV connections. The resulting meter readings will equate to 1 volt displayed = 100 volts measured... This will provide a more "direct" way to adjust the HV without significant loading and the accuracy will be normal tolerances.... Resistor, Thick Film, Res 1000 Megohms, Pwr-Rtg 1 W, Tol 1%, Radial, Planar 5 kv rated P/N SM102031007FE ALLIED STOCK NUMBER 70024570

@1nformatica

2 жыл бұрын

Thanks! Useful tip.

10:18 I don’t understand the bigclive joke cause both of u seem very similar but idk.

@1nformatica

4 жыл бұрын

I just meant that Big Clive often sketches circuits out in a similar way. To be compared with such greatness is praise indeed!!

@uraninite8151

4 жыл бұрын

@@1nformatica yeah he does .Have tested the Geiger counter in the field yet?i really want to see it in action

A delay inside an interrupt handler routine? Really?

@1nformatica

2 жыл бұрын

Apologies for committing such a heinous crime! Feel free to remove it! Thanks for watching, have a great day!

Some basic Information can be had here : drive.google.com/drive/folders/0B9itH-BnWE5sY2JGRkM4MWhSYkE

@pulesjet

4 жыл бұрын

You could have cleaned up that pulse just implementing about any fashions of a Schmit trigger. You must love the 555 ?

@1nformatica

4 жыл бұрын

Thanks. Very useful additional information.

@1nformatica

4 жыл бұрын

@@pulesjet Yes! It is my favorite IC of all time! Looks much better on camera too.

@pulesjet

4 жыл бұрын

@@1nformatica Must be why I have about a lb of the things. LOL

VIN is Voltage IN

@1nformatica

7 жыл бұрын

Well, actually no! It is the OUTPUT of the interrupt pulse..............kzread.info/dash/bejne/Zoil0ZV7aZvAl7A.html

you may need to calibrate it

@1nformatica

Жыл бұрын

In part 2 I briefly mention that : kzread.info/dash/bejne/dYSLmaWLda7RddI.html I used uranium beads as a rough guide then compared it against a certified commercial unit by Gamma Scout. Thanks for watching, have a great day!