GGreg20_V3 Ionizing Radiation Geiger Counter: a ready-to-use device with an SBM-20 or J305 Geiger tube and pulse counting outputDesigned by IoT-devices, LLC in Ukraine
June 2023: Despite Russia's aggression and war against Ukraine, our company works and delivers orders to customers all over the world
Purpose GGreg20_V3 Ionizing Radiation Geiger Counter is an electronic sensor module for building a personal counter of ionizing radiation level. For this purpose, the detector has an impulse counting…Read More…
GGreg20_V3 Ionizing Radiation Geiger Counter is an electronic sensor module for building a personal counter of ionizing radiation level. For this purpose, the detector has an impulse counting output to the main controller. Arduino, Adafruit, ESP8266, ESP32, and others can be used as a host controller.
The radiation level is indicated by light and sound signals. The user can mute sounds (jumper J1 - buzzer on/off).
GGreg20_V3 is an inexpensive and useful device for checking the “purity” of:
This module is useful for creating smart measurement devices for determining the power of ionizing radiation indoors or outdoors, and is available in both portable/pocket style and stationary mode. The only thing you need to start measuring ionizing radiation with the GGreg20 is any microcontroller that can count the number of pulses per unit time on GPIO.
Power supply of the SBM-20 tube is a built-in adjustable high voltage DC-DC converter. The target voltage level of 400 V is regulated by a potentiometer. The module is fine-tuned and ready for use.
WARNING! From September 1, 2022, the function of high voltage regulation has been removed. The voltage level of 400 volts is fixed by hardware means. At the same time, if you need a module with high voltage regulation for your project, please consider the module DCDC_3V3_400V_V1: High Voltage Module
February 2023 Update: The feedback we receive from customers about the planned implementation of the changes has led us to the decision not to rush to fix the voltage level on the module, as this limits the possibility of using other tubes compatible with the module. Therefore, we have decided not to make any changes at all and are supplying the module in its original configuration.
Dimensions and Pin assignments
GGreg20_V3 module pin assignments are as follows:
The dimensions of the GGreg20_V3 module are as follows:
Differences and compatibility with previous versions of GGreg20
|Names of characteristics||GGreg20_V3 (NEW)||GGreg20_V1||Improvement status|
|Stability of detection results||In the range of 2.4 - 5.5 volts (see note 2 and note 3)||Only at 5V supply voltage (uUSB input)||Improved|
|Power supply voltage range||2.2 - 5.5 volts (see note 2 and note 3)||3.7 - 5.5 volts||Improved|
|Autonomous power supply||1 cell Li (3.7V) or 2 cell Ni (2.4V) or battery 3V or AC / DC adapter 2.4 - 5.5 V (see note 2 and note 3)||1 cell Li (3,7V) or 3 cell Ni (3,6V) or 3 cell battery (4,5V) or AC/DC (5V) adapter||Improved|
|Complexity of the integration||Two connectors and one jumper (total 6 pin)||Three connectors and a jumper (11 pin in total)||Simplified|
|Protection against connection errors||Key-protected connectors are used and a Schottky diode is installed (see note 2 and note 3)||Not provided||Improved|
|Design and size compatibility||Same, except placing the power switch||-||mostly unchanged|
|Current consumption||near 30 мА||near 30 мА||no change|
|Calculation formula||-||-||no change|
|Measurement accuracy||20%||20%||no change|
|User interfaces||LED, buzzer, Output connector||LED, buzzer, Output connector||no change|
Note 1 The GGreg20_V2 module version has not been included in the comparison because it was developed for other design solutions (and did not provide space for the SBM-20 tube on the module board).
Note 2 The module board has a default protection diode against erroneous pole reversal when connecting the battery. Such protection will be appropriate despite the fact that it slightly narrows the voltage range of the input power supply which will be 3-5.5 volts.
Note 3 If you want to power the GGreg20_V3 from a 2.4 volt source, you need to short the Schottky diode shown in the photo with a wire or replace it with a 0 ohm resistor. Note, however, that such a correction will disable the module's reverse polarity protection.
Switching-on and measurements
This module is ready for use. The GGreg20_V3 modules are adjusted, configured and tested for compliance with the declared technical data before being shipped. Any adjustments or settings made by the customer may damage the module or introduce technical inconsistencies.
Connect the power input from the selected power source.
Turn on the power supply. After 10-15 seconds, you will hear a sound and see light signals when the active particles enter the tube.
At normal background radiation, the tube registers and generates 20-30 pulses per minute. The number of pulses can vary depending on weather or cosmic radiation. Consider the average number of signals per minute.
If you receive more than 60 signals per minute, be careful: your detector has “felt” a dangerous level of ionizing radiation from the environment or food, mushrooms, wood, etc
In short, the formula is simple: you need to accumulate the number of ingoing GPIO pulses per minute and then multiply by a factor. Like this:
microsieverts per hour = (impulses per minute) * 0.0092
where 0.0092 is a coefficient obtained from the tube manufacturer's documentation.
Tubes can vary (+ -20%), so we recommend using a conversion factor of 0.0054 to 0.0092 and calibrating the calculations with a trusted (certified) device.
Note: The differences between the tubes are: conversion factor for J305 is 0.00812, deadtime: 180 microseconds. Drivers and examples for SBM20 are compatible, but require replacement of the specified coefficients. It is recommended to operate the tube in a casing, as its bulb is transparent and measurements may be affected by photons of sunlight and similar factors.
Product kit sets
GGreg20_V3 basic and SBM-20 or J305 tube
Connectors (installed) and cables
Pulse output cable 15 cm with connectors --- 1 pc:
Power supply input cable 15 cm with JST XH 2P female connector on one side --- 1 pc.
GGreg20_V3 Case 3d-printed option
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|Shipping Rate||Tracked||Ships From||First Item||Additional Items|
Heinz-Bernd | Aug. 19, 2022
Patrick | Feb. 12, 2022
Donald | Sept. 14, 2021
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