ESPHome yaml example for CM1106/CM1107 and AHT10/AHT20

Edit: This was an issue from 2021, and it seems code for AHT10/AHT20 has been updated at some point. Please consider this as a piece of record of HA history. (2023-05-24)

I am running an ESP8266 in my living room to monitor carbon dioxide levels and temperature+humidity, using a CM1107 and AHT20.

CM1107: https://s.click.aliexpress.com/e/_A3DxcY
AHT20: https://s.click.aliexpress.com/e/_Anb8GU

As of September 2021, CM1106/CM1107 is not supported yet. So you have to use the following custom component. Many thanks to LeoDJ!

https://github.com/LeoDJ/ESPHome_Nodes/tree/main/CM1106_CO2_Sensor

Also, the temperature+humidity sensor AHT10/AHT20 is very buggy when connected to ESPHome. Some discussion was made on the issue page: https://github.com/esphome/issues/issues/1635

I had to make some adjustments to make it work properly. Please refer to the following youtube video.

Finally, the working ESPHome yaml example.

esphome:
  name: livingroom-air
  platform: ESP8266
  board: d1_mini
  includes:
  - "cm1106.h"

external_components:
  - source:
      type: git
      url: https://github.com/mahlernim/esphome
      ref: dev
    components: [ aht10 ]

wifi:
  ssid: !secret ssid
  password: !secret password
  manual_ip:
    static_ip: !secret ip_livingroom
    gateway: !secret ip_gateway
    subnet: 255.255.255.0
  ap:
    ssid: "livingroom"
    password: !secret ap_password

captive_portal:

logger:
  baud_rate: 0

api:

ota:

i2c:
  sda: D7
  scl: D6
  frequency: 200kHz

uart:
  rx_pin: RX
  tx_pin: TX
  baud_rate: 9600
  id: cm1107_uart

sensor:
- platform: custom
  lambda: |-
    auto cm1106Sensor = new CM1106Sensor(id(cm1107_uart), 20000);
    App.register_component(cm1106Sensor);
    return {cm1106Sensor};
  sensors:
  - name: "CM1107 CO2"
    accuracy_decimals: 0
    unit_of_measurement: "ppm"
    device_class: "carbon_dioxide"
    filters:
    - median:
        window_size: 5
        send_every: 5
        send_first_at: 3
- platform: aht10
  temperature:
    name: "Livingroom AHT Temperature"
    accuracy_decimals: 1
    filters:
    - filter_out: 0.0
    - median:
        window_size: 3
        send_every: 3
        send_first_at: 1
  humidity:
    name: "Livingroom AHT Humidity"
    accuracy_decimals: 1
    filters:
    - filter_out: 0.0
    - median:
        window_size: 3
        send_every: 3
        send_first_at: 1
  update_interval: 15s

switch:
- platform: custom
  lambda: |-
    auto cm1106Calib = new CM1106CalibrateSwitch(id(cm1107_uart));
    App.register_component(cm1106Calib);
    return {cm1106Calib};
  switches:
  - name: "CM1107 400ppm Calibration"