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Geiger counter with Si3-BG Geiger tube. It is very insensitive and it requires 400V to operate. With some modifications in hardware it can be adapted for use with other (more sensitive) tubes.
In schematics you can find the source in KiCAD. The circuit consists is a simple buck converter with NE555 that increases voltage from 5V to approx. 400V. I suggest using 555 chip from Texas instruments. The rest is simple 2x16 lcd display module pinout, power supply with switch and pin configuration for codecting nodeMCU module with ESP8266.
There are many ways on how to improve the basic circuit ;).
if you want to autostart firmware add line put main.py into mpfshellscript
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