co2-sm3.yaml

# 29.11.2025 R.Krüger --- Erstellung
# https://github.com/RK62/esphome/blob/main/co2-sm3.yaml

substitutions:
  device_name: "co2-sm3"
  friendly_name: "CO2-SM3"
  project_name: "Ralf Krüger.CO2-Sensor"
  project_version: "1.30"

esphome:
  name: ${device_name}
  name_add_mac_suffix: false
  friendly_name: ${friendly_name}
  project:
    name: ${project_name}   
    version: ${project_version}
  on_boot: 
    - priority: 800
      then:
        - delay: 1s
        - display.page.show: PAGE01
        - component.update: DISPLAY
        - delay: 10s
        - component.update: CO2_SENSOR # CO2-Wert updaten

esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: esp-idf

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "FTYv/RwusBNZZSSO7R/13/xB8Xksa+ytdQauXiDimeM="

  actions:

    - action: calibrate_co2_value
      variables:
        co2_ppm: int
      then:
        - scd4x.perform_forced_calibration:
            id: CO2_SENSOR
            value: !lambda 'return co2_ppm;'

    - action: factory_reset
      then:
        - scd4x.factory_reset: CO2_SENSOR

    - action: set_ambient_pressure
      variables:
        pressure_mbar: int
      then:
        - lambda: "id(CO2_SENSOR)->set_ambient_pressure_compensation(pressure_mbar);"      

ota:
  - platform: esphome
    password: "5c3b42f4f6c0e7eff99fcc62284069c9"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  min_auth_mode: WPA2

# Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "${friendly_name} Hotspot"
    password: "0123456789"

captive_portal:

# ==============================================================================

# ------------------------------------------------------------
i2c:
# ------------------------------------------------------------  
  sda: GPIO5
  scl: GPIO6

# ------------------------------------------------------------
font:
# ------------------------------------------------------------
  - id: FONT_N
    file: "gfonts://Inter"
    size: 22

  - id: FONT_B
    file: "gfonts://Inter"
    size: 29

# ------------------------------------------------------------
display:
# ------------------------------------------------------------  
  - platform: ssd1306_i2c
    id: DISPLAY
    model: "SSD1306 72x40"
    rotation: 0
    update_interval: never
    pages:
      - id: PAGE01
        lambda: |-
          it.print(0,  0,  id(FONT_N), "Hi" );
          it.print(26, 18, id(FONT_N), "Bro!" );
      - id: PAGE02
        lambda: |-
          it.printf(35, 16, id(FONT_B), TextAlign::CENTER, "%.0f", id(CO2_WERT).state);  
          it.rectangle(0, 35, 71, 4);
          it.filled_rectangle(0, 36, id(CO2_WERT).state * 0.05, 4);   
      - id: PAGE03
        lambda: |-
          it.printf(35, 16, id(FONT_B), TextAlign::CENTER, "%.1f°", id(TEMPERATUR).state);
      - id: PAGE04
        lambda: |-
          it.printf(35, 16, id(FONT_B), TextAlign::CENTER, "%.0f%%", id(FEUCHTIGKEIT).state);  

# ------------------------------------------------------------
interval:
# ------------------------------------------------------------  
  - interval: 5s
    startup_delay: 15s
    then:
      - display.page.show_next: DISPLAY
      - component.update: DISPLAY

# ------------------------------------------------------------
sensor:
# ------------------------------------------------------------  
  - platform: scd4x
    id: CO2_SENSOR
    update_interval: 60s

    co2:
      id: CO2_WERT
      name: "CO2"
      accuracy_decimals: 0
      filters:
        - round: 1
      on_value:
        then:
          - script.execute: SET_AMPEL

    temperature:
      id: TEMPERATUR
      name: "Temperatur"
      accuracy_decimals: 1
      filters:
        - offset: -1.4   # Datenkorrektur
        - round: 1
    
    humidity:
      id: FEUCHTIGKEIT
      name: "Feuchtigkeit"
      accuracy_decimals: 0
      filters:
        - offset: -4.0    # Datenkorrektur
        - round: 1

# ------------------------------------------------------------
light:
# ------------------------------------------------------------
  - platform: binary
    id: LED_RED
    name: "LED Rot"
    disabled_by_default: True
    output: IO_RED
  
  - platform: binary
    id: LED_YELLOW
    name: "LED Gelb"
    disabled_by_default: True
    output: IO_YELLOW
  
  - platform: binary
    id: LED_GREEN
    name: "LED Grün"
    disabled_by_default: True
    output: IO_GREEN
  
# ------------------------------------------------------------
output:
# ------------------------------------------------------------
  - id: IO_RED
    platform: gpio
    pin: GPIO21

  - id: IO_YELLOW
    platform: gpio
    pin: GPIO20

  - id: IO_GREEN
    platform: gpio
    pin: GPIO10
        
# ------------------------------------------------------------
script:
# ------------------------------------------------------------
  - id: SET_AMPEL
    then:
      # - component.update: DISPLAY # Display updaten

      - if:
          condition: 
            lambda: return isnan(id(CO2_WERT).raw_state);
          then:
            - light.turn_off: LED_GREEN
            - light.turn_off: LED_YELLOW
            - light.turn_off: LED_RED

      - if:
          condition:
            lambda: return id(CO2_WERT).state < 800;
          then:
            - light.turn_on:  LED_GREEN
          else:
            - light.turn_off: LED_GREEN

      - if:
          condition:
            lambda: return id(CO2_WERT).state >= 700
                        && id(CO2_WERT).state < 1300;
          then:
            - light.turn_on:  LED_YELLOW
          else:
            - light.turn_off: LED_YELLOW

      - if:
          condition:
            lambda: return id(CO2_WERT).state > 1200;
          then:
            - light.turn_on:  LED_RED
          else:
            - light.turn_off: LED_RED