Opengeiger

EIKGEIGER

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

First Batch

Thanks to PCBway for providing assembled prototype units for this project. Its awesome that you support the opensource community like this! If you want one for yourself, i've made a pcbway project which you can make an assembly order quite easily.

Description

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

Thanks to the DIYgeiger radmon project for inspiration DIYGeiger RADMON + kit.

If you want to handsolder this, i really recommend to check out the awesome IBOM assembly utility (use it with a desktop as it sucks on mobile) Assembly IBOM

SCHEMATIC

Specifications

Serial port controll comands

To reconfigure device settings you need to connect the eikgeiger to a computer with a serial terminal (I reccomend to just use the Arduino Program, but any serial terminal should work)

When you want to configure a value you use two characters plus a number. So to set the PWM frequency to 2000hz, you would write PF2000 in the terminal and send. Some commands need a specific number, eg to factory reset you must transmit FR9999. after you have verified that the configuraion works you use SA1 to save the config to the flash eeprom

Description

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.

Homeassistant Implementation

To add the sensor in home assistant, use the following YAML sensor, supplied by u/chillinorway

sensor:
  - platform: rest
    name: EIK_Geiger
    resource: http://<IP-Address>/cpm
    json_attributes:
      - "data"
    value_template: "OK"
  - platform: template
    sensors:
      cpm:
        value_template: "{{ state_attr('sensor.EIK_Geiger', 'data')['cpm'] }}"
        unit_of_measurement: "cpm"
      cpm_m:
        value_template: "{{ state_attr('sensor.EIK_Geiger', 'data')['cpm_M'] }}"
        unit_of_measurement: "cpm_avg_m"
      cpm_h:
        value_template: "{{ state_attr('sensor.EIK_Geiger', 'data')['cpm_H'] }}"
        unit_of_measurement: "cpm_avg_h"
      raw_volt:
        value_template: "{{ state_attr('sensor.EIK_Geiger', 'data')['raw_volt'] }}"
        unit_of_measurement: "raw_voltage"

BUCK BOOST CONVERTER

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 reaonably 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

More Pictures

Renders

SBM-20 Enclosure

SBM-19 Enclosure