To run the show, [g3gg0] selected the ESP32-PICO-D4. You certainly don’t need such a powerful microcontroller to read the impulses from the SBM-20 tube and publish them via MQTT, but to be fair ...
If you want to try a Scratch-inspired take on microcontroller programming ... to make the browser version work with an ESP32 S3 module we had sitting on the desk. The tutorials have videos ...