Geiger counter - Revision history

Alnwlsn at 01:36, 20 July 2025

2025-07-20T01:36:18Z

← Older revision		Revision as of 21:36, 19 July 2025
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	[[File:Geiger-counter-overview.jpg\|thumb\|Completed unit in 2018.]]		[[File:Geiger-counter-overview.jpg\|thumb\|Completed unit in 2018.]]

			[[File:Geiger-schematic.png\|thumb\|Schematic]]

	A Geiger counter has been on my list of projects for a while, and in Spring 2018 I made one based on the very available Russian SBM-20 Geiger-Muller tubes, one of the most common cheap tubes on Ebay.		A Geiger counter has been on my list of projects for a while, and in Spring 2018 I made one based on the very available Russian SBM-20 Geiger-Muller tubes, one of the most common cheap tubes on Ebay.

2019-10-27T18:08:03Z

2019 redesign

← Older revision		Revision as of 14:08, 27 October 2019
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	** Microusb - Connect USB to charge battery. It should not be used to run the system, probably.		** Microusb - Connect USB to charge battery. It should not be used to run the system, probably.
	** Power switch - Switches between battery power and external power barrel connector.		** Power switch - Switches between battery power and external power barrel connector.
	===2019 redesign===		====2019 redesign====
	The first case was very brittle ever since it came off the printer, and it eventually broke apart. I had made some more successful case designs for my other projects since then, and I decided to make a new case.		The first case was very brittle ever since it came off the printer, and it eventually broke apart. I had made some more successful case designs for my other projects since then, and I decided to make a new case.
	* I removed the segmented interior, so that the different components could be set into the case without the trouble of running wires through a bunch of different holes.		* I removed the segmented interior, so that the different components could be set into the case without the trouble of running wires through a bunch of different holes.

2019-10-27T18:07:33Z

Case

@@ Line 26: / Line 26: @@
 ** Microusb - Connect USB to charge battery. It should not be used to run the system, probably.
 ** Power switch - Switches between battery power and external power barrel connector.
 ==Software / Operator interface==

2019-09-08T17:10:43Z

Files

← Older revision		Revision as of 13:10, 8 September 2019
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	==Files==		==Files==
	[[File:Geiger-sketch.zip]] - Arduino sketches (attiny)		*[[File:Geiger-sketch.zip]] - Arduino sketches (attiny)
	[[File:Wilson-geiger-pcb-v1.zip]] - Eagle and gerber files for a PCB		*[[File:Wilson-geiger-pcb-v1.zip]] - Eagle and gerber files for a PCB

2019-09-08T17:10:30Z

Files

← Older revision		Revision as of 13:10, 8 September 2019
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	==Files==		==Files==
	[[File:Geiger-sketch.zip]] - Arduino sketches (attiny)		[[File:Geiger-sketch.zip]] - Arduino sketches (attiny)
			[[File:Wilson-geiger-pcb-v1.zip]] - Eagle and gerber files for a PCB

2019-08-14T20:23:56Z

Files

← Older revision		Revision as of 16:23, 14 August 2019
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	==Files==		==Files==
	File:Geiger-sketch.zip		[[File:Geiger-sketch.zip]] - Arduino sketches (attiny)

2019-08-14T20:23:13Z

2019-08-14T20:19:09Z

← Older revision		Revision as of 16:19, 14 August 2019
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	* 9 - Display 4 lower "random" bits		* 9 - Display 4 lower "random" bits
	** C - displays decimal representation of 8 random bits (0 to 255).		** C - displays decimal representation of 8 random bits (0 to 255).

			==Files==

2019-08-08T16:04:21Z

Hardware

← Older revision		Revision as of 12:04, 8 August 2019
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	==Hardware==		==Hardware==
	~~I haven't opened the system for a while, and since~~ it has been a while since building, I don't have a full schematic ready. But briefly:		Since it has been a while since building, I don't have a full schematic ready. But briefly:
	* The GM tube is a SBM-20. It can measure beta and gamma radiation. A resistor of several megaohms is placed in series to protect the tube from excessive current flow.		* The GM tube is a SBM-20. It can measure beta and gamma radiation. A resistor of several megaohms is placed in series to protect the tube from excessive current flow.
	* An ATTiny84 microcontroller controls the HV power supply, counting, and user interface.		* An ATTiny84 microcontroller controls the HV power supply, counting, and user interface.

2018-11-05T00:36:44Z

Modes

← Older revision		Revision as of 20:36, 4 November 2018
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	===Modes===		===Modes===
	There are '''9''' modes in the current system:		There are '''10''' modes in the current system:
	* 0 - Counts per minute, calculated over 1 minute.		* 0 - Counts per minute, calculated over 1 minute.
	** '''C'''enter button - Displays seconds of the frame (0 to 59). When the number has rolled over back to where it was, one minute has passed, and a complete set of new data has been read.		** '''C'''enter button - Displays seconds of the frame (0 to 59). When the number has rolled over back to where it was, one minute has passed, and a complete set of new data has been read.
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	* 8 - Displays battery voltage (in Volts *100)		* 8 - Displays battery voltage (in Volts *100)
	** C - displays analogRead() value of battery reading.		** C - displays analogRead() value of battery reading.
			* 9 - Display 4 lower "random" bits
			** C - displays decimal representation of 8 random bits (0 to 255).