Geiger counter RadiationD v1.1 (CAJOE)

With the help of pulse_counterand the RadiationD v1.1(CAJOE) you can make your own Geiger counter, which will give you a more or less precise messurement of the current radation level. But it should be good enough to warn you about critical events.

Assembly

The first step is to connect the sensor.

You just need to connect the +5V, the ground and a GPIO pin to the ESP. In my case I used the pin 34 for the signal. (The print on the PCB is wrong VIN is the signal.) This setup should give you the pulse of each messurement or count. For more information check the Video of Andreas Spiess.

Housing

I just 3D printed an small housing the avoid touching the high voltage Geiger Mueller tube. Counter Tube Case (The tube should not be in direct sunlight. So maybe you will need another case.)

Configuration

The block pulse_counter will count the radation events per minute. With the found specs of the tube you will be able to calculate the radiation in μSv/h.

It's just the counts per minute (CPM) times the factor of your Geiger Mueller tube you're using. It should be the J305ß, which comes with the PCB. (To make sure - check your printing on the tube)

μSv/h = (CPM - Tube noise) * Factor According to the video of Andreas Spiess the tube should have about 12 CPM as background noise.

Note

The current version of the pack comes with the J305ß Geiger tube which detectes Beta and Gamma radiation. Specifications: Manufacturer: North Optic Radiation Detection: β, γ Length: 111mm Diameter: 11mm Recommended Voltage: 350V Plateau Voltage: 360-440V Sensitivy γ (60Co): 65cps/(μR/s) Sensitivy γ (equivalent Sievert): 108cpm / (μSv/h) Max cpm: 30000 cps/mR/h: 18 cpm/m/h: 1080 cpm/μSv/h: 123.147092360319 Factor: 0.00812037037037

Source: opengeiger.de/LibeliumDoku.pdf.

sensor:
  - platform: pulse_counter
    pin: 34
    name: "Radiation"
    unit_of_measurement: 'μSv/h'
    count_mode:
     rising_edge: DISABLE
     falling_edge: INCREMENT
    filters:
      - offset: -12.0 # J305ß Geiger Mueller tube background noise 0.2 pulses / sec x 60 sec = 12 CPM (Counts per Minute)
      - multiply: 0.00812037037037 # Factor: 0.00812037037037

Advanced version with every second update including last minute history values

globals:
  - id: pulse_history
    type: int[60]
    restore_value: no
    initial_value: "{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}"

  - id: pulse_index
    type: int
    restore_value: no
    initial_value: "0"

  - id: pulse_sum
    type: int
    restore_value: no
    initial_value: "0"

sensor:
  - platform: pulse_counter
    id: geiger_cps
    internal: true
    pin:
      number: 34
      inverted: True
      mode:
        input: True
        pullup: False
        pulldown: False
    unit_of_measurement: 'CPS'
    name: 'Ionizing Radiation Power CPS'
    count_mode:
      rising_edge: DISABLE
      falling_edge: INCREMENT
    accuracy_decimals: 0
    update_interval: 1s
    filters:
      delta: 1
    on_raw_value:
      then:
        - lambda: |-
            x=round(x/60); // esphome calculating based on pulses per minute. round required to avoid problem when esphome calc value less than 60 pulses per minute (for example 59.7)
            id(pulse_sum) -= id(pulse_history)[id(pulse_index)]; // remove old value from overall sum
            id(pulse_history)[id(pulse_index)] = x; // 'x' is the raw pulse count
            id(pulse_sum) += x; // add new value to overall sum

            id(pulse_index)++; // change array index where next value will be stores
            if (id(pulse_index) >= 60) id(pulse_index) = 0; // Reset at 60
    on_value:
      then:
        component.update: geiger_cpm

  - platform: template
    id: geiger_cpm
    unit_of_measurement: 'CPM'
    name: 'Ionizing Radiation Power CPM'
    accuracy_decimals: 0
    update_interval: 1s
    state_class: measurement
    lambda: return id(pulse_sum);
    filters:
      delta: 1

  - platform: copy
    source_id: geiger_cpm
    id: ionizing_radiaton_power
    unit_of_measurement: 'µSv/h'
    name: 'Ionizing Radiation Power'
    state_class: measurement
    icon: mdi:radioactive
    accuracy_decimals: 3
    filters:
      - skip_initial: 15
      - sliding_window_moving_average: # 15 measurements moving average (MA5) here
          window_size: 15
          send_every: 1
      - multiply: 0.0057 # 0.0057 original value or 0.00332 for J305 by IoT-devices tube conversion factor of pulses into uSv/Hour