air_quality_sensor.yaml

esphome:
  name: air_quality_sensor
  platform: ESP8266
  board: nodemcuv2

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_psk

api:

logger:

ota:

binary_sensor:
  - platform: status
    name: "Air Quality Sensor Status"

i2c:
  sda: D5
  scl: D6

display:
  - platform: lcd_pcf8574
    dimensions: 18x2
    address: 0x27
    lambda: |-
      it.printf(0, 0, "AQI 2.5: %.1f", id(aqi25).state);
      it.printf(0, 1, "AQI 10.0: %.1f", id(aqi10).state);

uart:
  rx_pin: D1
  tx_pin: D2
  baud_rate: 9600

sensor:
  - platform: sds011
    pm_2_5:
      id: pm25
    pm_10_0:
      id: pm10
    update_interval: 5min
  - platform: template
    id: aqi25
    name: "Air Quality Index 2.5"
    icon: mdi:chemical-weapon
    unit_of_measurement: AQI
    accuracy_decimals: 2
    lambda: |-
      // NOTE: this calculation logic varies by location
      if(isnan(id(pm25).state)) return id(pm25).state;
      else if (id(pm25).state<=12.0) return (50.-0.)/(12.0-0.)*(id(pm25).state-0.0)+0.;
      else if (id(pm25).state<=35.4) return (100.-50.)/(35.4-12.0)*(id(pm25).state-12.0)+50.;
      else if (id(pm25).state<=55.4) return (150.-100.)/(55.4-35.4)*(id(pm25).state-35.4)+100.;
      else if (id(pm25).state<=150.4) return (200.-150.)/(150.4-55.4)*(id(pm25).state-55.4)+150.;
      else if (id(pm25).state<=250.4) return (300.-200.)/(250.4-150.4)*(id(pm25).state-150.4)+200.;
      else if (id(pm25).state<=350.4) return (400.-300.)/(350.4-250.4)*(id(pm25).state-250.4)+300.;
      else if (id(pm25).state<=500.4) return (500.-400.)/(500.4-350.4)*(id(pm25).state-350.4) +400.;
      else return 501.;
    filters:
      - filter_out: nan
  - platform: template
    id: aqi10
    name: "Air Quality Index 10.0"
    icon: mdi:chemical-weapon
    unit_of_measurement: AQI
    accuracy_decimals: 2
    lambda: |-
      // NOTE: this calculation logic varies by location
      if(isnan(id(pm10).state)) return id(pm25).state;
      else if (id(pm10).state<=54.) return (50.-0.)/(54.-0.)*(id(pm10).state-0.)+0.;
      else if (id(pm10).state<=154.) return (100.-50.)/(154.-54.)*(id(pm10).state-54.)+50.;
      else if (id(pm10).state<=254.) return (150.-100.)/(254.-154.)*(id(pm10).state-154.)+100.;
      else if (id(pm10).state<=354.) return (200.-150.)/(354.-254.)*(id(pm10).state-254.)+150.;
      else if (id(pm10).state<=424.) return (300.-200.)/(424.-354.)*(id(pm10).state-354.)+200.;
      else if (id(pm10).state<=504.) return (400-300)/(504.-424.)*(id(pm10).state-424.);
      else if (id(pm10).state<=604.) return (500.-400.)/(604.-504.)*(id(pm10).state-504.)*400.;
      else return 501.;
    filters:
      - filter_out: nan