2 layers137 × 84 mm

ESP32-Geiger Counter
AronASzucs/Avalanche32
Handheld ESP32-S3 Geiger counter with a firmware-regulated 400 V boost, SBM-20 tube, USB-C charging and OLED display.
89 parts3
KiCad boards from 1 GitHub repository tagged “sbm-20”, the most starred first; open any of them in PCBKit.

AronASzucs/Avalanche32
Handheld ESP32-S3 Geiger counter with a firmware-regulated 400 V boost, SBM-20 tube, USB-C charging and OLED display.