Eikgeiger opensource project for detection of background radiation in Norway. It is developed in cooperation with Eik Ideverksted at NMBU. Use the design for anything you like commercially and privately, but i would love if you fork it so i can see what it is used for.

It uses anESP32-WROOM-32E wifi module both communication and MCU, and is mostly based on surface mount components.

Powe Supply

It is designed for SBM-20 GM tube integrated onto the PCB with 6.3mm fuse holders, but it can use any tube up to 1000v if you just solder on some leads. The power supply is a standard buck boost, but with a 4x voltage multiplier output. It seems reasonably of effective, and consumes about 4ma@3.3v delivering 350v out running at 1000hz pwm. It has a voltage feedback read by adc2 on the esp32 module, but from experimentation i found it more stable to just set a pwm level rather than actively regulating it

The pcb has one pinheader (J5) which can be used for 1 x i2c or 2 x Onewire io, and one header (J10) with 1xGpio, and 1x mosfet open collector for eg a clicker. A piezo buzzer with 5mm pitch can be directly soldered in the header holes. It is allso possible to split out the 5v from the usb to insert an ebay generic lipo charger/powersuply to make it battery driven with usb charging.

It allso implements an integrated FTDI chip to get serial over USB, and a transistor based rts#/dtr# pulldown function for the boot pin on the ESP (shamelessly stolen from the weemos d1 mini design) so it allows for automatic programming over USB without pushing the boot pin.