DFRobot Gravity Geiger Counter Ionizing Radiation Detector Module

This module, equipped with an M4011 Geiger-Müller tube, is sensitive to ionizing radiation, specifically alpha particles, beta particles, and gamma rays. It cannot detect non-ionizing electromagnetic radiation such as WiFi, microwave, or radio frequency signals.

Connect the module using the included Gravity 3-pin cable: Red (VCC) to 5V or 3.3V, Black (GND) to GND, and Blue/Green (SIG) to a digital input pin on your microcontroller. The output is a digital pulse that goes LOW when radiation is detected, which can be counted using interrupts or polling.

The 1200 μSv/h (microsieverts per hour) is a theoretical maximum detection range for the integrated M4011 Geiger tube. This module is designed for educational and demonstrative purposes; for precise, safety-critical dose measurement, certified professional instrumentation is required.

No, the module includes an onboard high-voltage generation circuit that produces the approximately 400V required to bias the Geiger-Müller tube. You only need to supply 3.3V to 5V DC to the module's VCC and GND pins.

Yes, the inherently random timing of natural background radiation events detected by the Geiger tube provides a high-quality source of entropy. The digital pulse output can be fed into a microcontroller's random number generation algorithm to produce true random numbers, not pseudo-random sequences.