homeassistant-config/esphome/geigercounter.yaml

esphome:
  name: geigercounter
  platform: ESP32
  board: nodemcu-32s

wifi:
  ssid: "Voltage-legacy"
  password: !secret voltage_legacy_psk
  use_address: geigercounter.home  
  power_save_mode: high
  fast_connect: on

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Geigercounter Fallback Hotspot"
    password: !secret fallback_psk

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: !secret api
  encryption: 
    key: !secret apikey

ota:
  password: !secret ota

spi:
  clk_pin: 18
  mosi_pin: 21

display:
  - platform: max7219
    cs_pin: 16
    num_chips: 1
    lambda: |-
      if(id(sun_state).has_state()) {
        // dim 7 segment's LED brighness at nighttime
        if (id(sun_state).state == "below_horizon") {
          it.set_intensity(2);
        } else {
          it.set_intensity(12);
        }
      }
      it.print("        ");
      it.printf("%2.2f uSh", id(dose_meter).state);

# Here we calc and include to the firmware a power and doze values of ionizing radiation as sensor outputs
sensor:
  - platform: pulse_counter
    pin: 19
    unit_of_measurement: "µSv/h"
    name: "Radioaktive Strahlungsleistung"
    icon: "mdi:radioactive"
    count_mode:
      rising_edge: DISABLE
      falling_edge: INCREMENT
    update_interval: 60s
    accuracy_decimals: 3
    id: dose_meter
    filters:
      - sliding_window_moving_average: # 5-minutes moving average (MA5) here
          window_size: 5
          send_every: 1
      - multiply: 0.0054 # SBM20 tube conversion factor of pulses into µSv/Hour
  - platform: integration
    name: "Gesamte Strahlungsdosis"
    unit_of_measurement: "µSv"
    sensor: dose_meter # link entity id to the pulse_counter values above
    icon: "mdi:radioactive"
    accuracy_decimals: 5
    time_unit: min # integrate values every next minute
    filters:
      - multiply: 0.00009 # obtained doze (from mkSv/hour into mkSv/minute) conversion factor: 0.0054 / 60 minutes = 0.00009; so pulses * 0.00009 = doze every next minute, µSv.
text_sensor:
  - platform: homeassistant
    entity_id: sun.sun
    id: sun_state