Integrating the CO2 module

Add Carbon Dioxide monitoring to your Everything Presence One.

Please note the CO2 module is only compatible with Home Assistant and not SmartThings at this time.

Hardware

First take your EP1 (with it powered off!) and identify the GPIO pins in the bottom corner (depending on your board your revision, these may look slightly different):

Grab your CO2 module and push it onto the pins, making sure to line up the 3.3v and Ground pins:

Software

You will need the ESPHome add-on installed in Home Assistant and the code for your Everything Presence One adopted (you should be automatically prompted to do this if you haven’t already done so).

Once you have your config showing up in the ESPHome dashboard, hit edit on the config.

Then at the bottom of the config, add the following lines. These will differ depending on your Everything Presence One board revision. The board revision number is marked in the bottom left hand corner of the Everything Presence One board.

If you have revision 1.3 or 1.4:

i2c:
  - id: bus_a
    sda: GPIO26
    scl: GPIO25
    scan: True
  - id: bus_b
    sda: GPIO18
    scl: GPIO19
    scan: true


sensor:
  - id: !extend illuminance_sensor
    i2c_id: bus_a
  - id: !extend shtc3_sensor
    i2c_id: bus_a
  - platform: scd4x
    i2c_id: bus_b
    co2:
      name: "CO2"

If you have revision 1.5:

i2c:
  - id: bus_a
    sda: GPIO26
    scl: GPIO25
    scan: True
  - id: bus_b
    sda: GPIO18
    scl: GPIO22
    scan: true


sensor:
  - id: !extend illuminance_sensor
    i2c_id: bus_a
  - id: !extend shtc3_sensor
    i2c_id: bus_a
  - platform: scd4x
    i2c_id: bus_b
    co2:
      name: "CO2"

Then hit save and install to complete.

If your ESPHome config produces an error when trying to install, try hitting the “clean build files” button on the config to clear your cache, then try again.

Once installed, the CO2 sensor should automatically show up in Home Assistant, nice!