esphome.yaml

substitutions:
  devicename: geiger
  upper_devicename: Geiger Counter

esphome:
  name: $devicename
  platform: ESP32
  board: nodemcu-32s

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  
  ap:
    ssid: ${upper_devicename} Fallback Hotspot
    password: !secret fallback_password
    
captive_portal:

# Optional manual IP
#  manual_ip:
#    static_ip: 192.168.0.195
#    gateway: 192.168.0.1
#    subnet: 255.255.255.0

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: !secret api_password

ota:
  password: !secret ota_password

switch:
  - platform: restart
    name: ${upper_devicename} Restart
    
text_sensor:
  - platform: wifi_info
    ip_address:
      name: ${upper_devicename} IP Address
    ssid:
      name: ${upper_devicename} Connected SSID
    bssid:
      name: ${upper_devicename} Connected BSSID

sensor:
  - platform: pulse_counter
    pin: GPIO36
    name: ${upper_devicename}
    id: "geiger_counter"
    unit_of_measurement: 'CPM'
    on_raw_value:
      - sensor.template.publish:
          id: radiation_level
          state: !lambda 'return x / 153.8;'
          # this was what I got for my data sheet and it matched reasonably well with the background data that I have.  Many people are using other values.
  - platform: template
    name: "Radiation Level"
    id: "radiation_level"
    unit_of_measurement: 'µSv/h'
    icon: mdi:radioactive
    accuracy_decimals: 5
    
binary_sensor:
  - platform: template
    device_class: safety
    name: "Radiation Warning"
    # This doesn't necessarily represent a "dangerous" count, but one that is abnormally high
    lambda: |-
      if (id(geiger_counter).state > 100) {
        // High Count.
        return true;
      } else {
        // Normal Count.
        return false;
      }