Radiation contamination detector GGreg20 - a ready-to-use device with Geiger tube SBM-20

Purpose: radioactive particles detector - an electronic sensor module for building a personal ionizing radiation level counter. For this purpose, the detector includes an impulse counting output to a host controller. Arduino, Adafruit, ESP8266, ESP32, and others can be used as a host controller.

The radiation level is displayed by light and sound signals. Sounds can be muted by the user (jumper J1 - buzzer on/off).

GGreg20_V1 Set 1 - a cheap and useful device for checking the "purity" of mushrooms, berries, vegetables, firewood, etc.

Specifications:

1. Module dimensions - 31 x 125 x 12 mm. Weight 30 g.

2. Power supply:

   • from a rechargeable battery or a battery with a voltage of 4.5 - 6 Volts (port "Bat");

   • from a 5 Volt charger (micro-USB).

3. Power supply of the SBM-20 tube - adjustable high voltage generator of 400 volts. The voltage level is regulated by a potentiometer. The module is sold with fine-tuned parameters and ready for use. Detailed instructions and recommendations can be found at iot-devices.com.ua: GGreg20

4. Consumption current - 18 mA.
5. GGreg20_v1 is compatible with logic signal levels (3V3 ACTIVE-LOW: 3 to 3.3V in HIGH state and about 0.7V in LOW state) of ESP8266 / ESP32, and will work even with a 5V logic input.

Switching-on and measurements.

Connect the power input from the selected power source.

Be careful not to reverse the polarity - this will damage the device.

Turn on the power supply and in 1-2 minutes, you will hear the sound and see light signals when active particles enter the tube.

With a normal background level of radiation, the tube registers and generates 20-30 pulses per minute. The number of pulses can fluctuate depending on the 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" the effects of radiation emissions from food, mushrooms, or wood.

In 2021, we began serial assembly and soldering of modules GGreg20_V1_Set_1 using new equipment (see video). Our equipment provides a high assembly speed and guarantees the quality of the module.