Report Radiation Ranges Over MQTT with the IoT Geiger Counter v3.1

Utilizing a Geiger-Müller tube as the idea of a DIY Geiger counter is just not a brand new thought. However, surprisingly, only a few of the present tasks have a built-in WiFi radio to speak counts. The IoT Geiger Counter, now in its third model, from g3gg0, provides an ESP32 to a counter design to ship radiation and different environmental measurements to an MQTT dealer.

An SBM-20 model G-M tube dominates the IoT Geiger Counter’s circuit board. The tube’s size comes out to about 105 millimeters. Due to this tube, the system is unmistakable as a Geiger counter. Nevertheless, some WS2812 RGB LEDs actually add a little bit of flash to the system. Their shade signifies the counter’s state. For instance, it’s inexperienced whereas idle, white flashes when counting, and purple when you will have a foul day.

An ESP32-PICO-D4 module powers the counter. The favored microcontroller has two apparent and one not-so-common perform. First, the ESP32 communicates with an MQTT dealer over WiFi. On this case, g3gg0 makes use of Grafana to show graphs of the captured information. The opposite apparent perform of the ESP32 is counting the pulses from the G-M tube.

SBM-20 tubes want 400 volts for operation. The non-obvious perform of the microcontroller is appearing as a controller in a lift circuit to generate the required high-voltage (HV). It outputs a PWM sign to excite the inductor and makes use of a voltage divider to drop the HV right down to the 1.1 volt vary the ESP32 can deal with.

Initially, g3gg0 tried to make use of floor mount elements for the complete design. Nevertheless, the increase transformed wanted 10 milliHeneries to realize a secure 400 volts. And sadly, the equal collection resistance (ESR) of floor mount inductors was too excessive. So, the design now depends on a through-hole inductor.

Not solely does the IoT Geiger Counter measure radiation, however it additionally has two different environmental sensors. A CCS811 risky natural compound sensor displays VOCs. And a BME280 measures temperature and humidity. Along with the RGB LEDs, there’s a 5.83 inch electrophoretic show (EPD). These are also referred to as E-Paper. This show reveals this sensor information.

g3gg0 demonstrating with Uranium Glass

You possibly can construct an IoT Geiger Counter utilizing this weblog/tutorial from g3gg0. There are directions and choices for every of the blocks. It particulars just a few bugs, together with an natural bug that triggered a high-voltage breakdown. (So, is that this additionally an IoT bug zapper?). All design information can be found from the hyperlinks on the finish of the put up.

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