The goal of this project is to design a Geiger counter and continuous radiation monitor in one device. This means two things:

• low energy consumption, so batteries last for months of continuous monitoring
• a display capable of displaying exact instantaneous radiation levels

Nice to have things:

• measurement history (at least 10 minutes)
• cumulative dose

Schematic

Building

At least 14.1.0 avr-gcc is required. Steps needed to build from source can be found in build.yml. u8g2 needs to be cloned into external subdirectory. Then the usual CMake routine can commence:

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DAVR_MCU=attiny3226 \
      -DAVR_PROGRAMMER=serialupdi -DAVR_PROGRAMMER_PORT=/dev/ttyUSB0 \
      -DMCU_FREQ=10000000 -DCMAKE_TOOLCHAIN_FILE=../toolchain-avr-gcc.make ..
make -j

Fairly recent AVRDUDE is also needed in order to use UPDI flashing via a USB-to-serial converter.

Menu structure

More info

The average current consumption with display turned off is ~200uA. A set of 3 AAA batteries should last more than a year.