TeHyBug Senseair CO2 Sensor for HomeAssistant and EspHome

We spend over 90% of our time indoors, where the amount of CO2 we exhale has a significant impact on our health and well-being. High CO2 concentrations not only lead to tiredness, headaches and can cause dizziness, they are also a good indicator of when the distribution of aerosols in the air exceeds a value that is more conducive to the spread of coronaviruses. Ventilation therefore reduces the risk of corona infection.

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New TeHyBug device with CO2 Senseair S8 sensor that also supports additional TeHyBug Universal sensors. Unfortunately, the default TeHyBug software is not supported by this new device, it wasn’t developed yet, but you can flash EspHome to it and connect the device to your home assistant, the configuration for EspHome I will post below.

The features:

• SenseAir S8 CO2 Sensor
• ESP8285 Wifi Chip that serves the sensor data directly to homeassistant, no zigbee gateway etc. needed.
• CH340 USB to UART Chip for flashing and programming
• 4 Buttons: 1 Mode (set flashmode), Reset, IO_5 and IO_14 are free programmable
• TeHyBug Universal sensor connector to extend the device with. more sensors, like temperature, humidity, barometric air pressure, UV Light or Luminance
• WS2812B indicator LED, for indicating the Air Quality

EspHome configuration:

esphome:
  name: tehybugco2

esp8266:
  board: esp8285

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:
  password: "5965ae0dcewvr546a66e0830fc"

wifi:
  ssid: "MyWifiNetwork"
  password: "MyWifiPassword"

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Co2Test Fallback Hotspot"
    password: "17Ij4qwdZQTOko"

captive_portal:

# show co2 status color
binary_sensor:
  - platform: status
    name: "Infostrip Status"
  - platform: gpio
    name: Button 14
    pin:
      number: 14
      inverted: true
      mode:
        input: true
        pullup: true
    id: btn14

    on_press:
      - light.toggle: 
          id: light_fastled

  - platform: gpio
    name: Button 5
    pin:
      number: 5
      inverted: true
      mode:
        input: true
        pullup: true
    id: btn5
    on_press:
      then:
        - light.toggle:
            id: light_fastled
   
uart:
  # For software serial:
  rx_pin: GPIO4
  tx_pin: GPIO13
  baud_rate: 9600
  id: myuart2

sensor:
  - platform: senseair
    id: senseair_s8
    co2:
      name: "FreshAirMakesSense CO2 Value"
      id: senseair_co2
    update_interval: 60s
  - platform: aht10
    temperature:
      name: "FreshAirMakesSense AHT10 Temperature Value"
    humidity:
      name: "FreshAirMakesSense AHT10 Humidity Value"
    update_interval: 60s
  - platform: bmp280
    temperature:
      id: bmp280_temp
      name: "FreshAirMakesSense BMP280 Temperature Value"
      oversampling: 16x
    pressure:
      name: "FreshAirMakesSense BMP280 Pressure Value"
    update_interval: 60s

i2c:
  sda: GPIO0
  scl: GPIO2
  scan: True
  id: bus_a

  
# Configure each pixel as a single light (attention memory consuming)
light:
  - platform: neopixelbus
    type: GRB
    variant: WS2812
    pin: 12
    num_leds: 1
    name: "I_Strip_test"
    id: light_fastled
    on_turn_on:
     then:
        - light.control:
            id: light_fastled
            effect: Light Effect
    effects:
      - lambda:
          name: Light Effect
          update_interval: 10s
          lambda: |-
            	int state = id(senseair_co2).state;
            	auto call = id(light_fastled).turn_on();
            	call.set_transition_length(500);
            	if(state > 1500)
            	{
            	  call.set_rgb(.5, 0, 0);
            	}
            	else if(state > 1000)
            	{
            	  call.set_rgb(.5, .5,  0);
            	}
            	else
            	{
            	  call.set_rgb(0, .5, 0);
            	}
            	call.perform();
button:
  - platform: template
    name: Calibration
    id: my_button
    on_press:
      then:
        - senseair.background_calibration: senseair_s8
        - delay: 120s
        - senseair.background_calibration_result: senseair_s8

How to calibrate the sensor?

connect it to a power bank and place it outside on fresh air, go to the entities of your home assistant, select the TeHyBug Co2 there and click the Calibration Button in the menu.