Utilizing a Geiger-Müller tube as the premise of a DIY Geiger counter shouldn’t be a brand new thought. However, surprisingly, only a few of the present tasks have a built-in Wi-Fi 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 type 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. Nonetheless, some WS2812 RGB LEDs actually add a little bit of flash to the system. Their coloration signifies the counter’s state. For instance, it’s inexperienced whereas idle, white flashes when counting, and purple when you’ll have a nasty day.
An ESP32-PICO-D4 module powers the counter. The favored microcontroller has two apparent and one not-so-common operate. First, the ESP32 communicates with an MQTT dealer over Wi-Fi. On this case, g3gg0 makes use of Grafana to show graphs of the captured information. The opposite apparent operate of the ESP32 is counting the pulses from the G-M tube.
SBM-20 tubes want 400 volts for operation. The non-obvious operate of the microcontroller is performing 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 all the design. Nonetheless, the increase transformed wanted 10 milliHeneries to attain a secure 400 volts. And sadly, the equal sequence 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 unstable natural compound sensor screens 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 called E-Paper. This show exhibits this sensor information.
You may construct an IoT Geiger Counter utilizing this weblog/tutorial from g3gg0. There are directions and choices for every of the blocks. It particulars a number of bugs, together with an natural bug that brought about a high-voltage breakdown. (So, is that this additionally an IoT bug zapper?). All design recordsdata can be found from the hyperlinks on the finish of the submit.