ESP32 Brings New Features To Classic Geiger Circuit
The OpenRad project, created by Omar Khorshid, is a sophisticated take on the classic Geiger counter circuit that uses the Soviet SBM-20 tube. This project integrates a microcontroller, making the circuit easier to assemble and more versatile in its functionality. The inclusion of a microcontroller means that the device’s features are only limited by the user’s coding capabilities, transforming a simple circuit into a powerful tool.
Central to OpenRad’s hardware is the standard SBM-20 circuit, enhanced with a LILYGO ESP32 development board featuring a TFT display. This setup forms the backbone of the project, but the real innovation lies in the firmware. Omar has created a robust interface that runs locally on the device, complemented by the ESP32’s ability to serve a web page for real-time data visualization. Additionally, the device can publish data via MQTT, allowing integration with home automation systems or other platforms.

The user interface is made even more accessible through the addition of hardware buttons, providing a highly capable and user-friendly experience. The web interface and MQTT support extend the device’s functionality, making it not just a standalone gadget but a component of a larger data ecosystem. This flexibility allows users to monitor radiation levels in real-time and integrate the data into various applications.
Omar has meticulously documented the OpenRad project on its GitHub repository. The documentation includes schematics, KiCad files, and Gerbers, providing all the necessary resources for others to recreate, assemble, and even modify the project. This thorough documentation ensures that anyone interested can build their own OpenRad device and tailor it to their specific needs.
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