ESPHome configuration for M5Stack's AtomLite + ENV-II *SHT30 / BMP280* Sensor

home-assistant-m5stack-atomlite-env-ii.yaml

substitutions:
  device_name: atomlite-outdoor-sensor
  friendly_name: "Outdoor Sensor"
  device_description: "Detects ambient temperature and pressure."

esphome:
  name: ${device_name}
  comment: ${device_description}
  
esp32:
  board: m5stack-core-esp32
  framework:
    type: arduino

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: ${friendly_name}
    password: !secret fallback_wifi_password

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: !secret esp32_secret

ota:
  password: !secret esp32_secret

i2c:
  sda: 26
  scl: 32
  scan: True
  id: bus_a

text_sensor:
  - platform: version
    name: "Version"

sensor:
  - platform: uptime
    name: "Uptime"

  - platform: wifi_signal
    name: "WiFi Signal"
    update_interval: 60s

##
# M5Stack ENV II 
# https://m5stack-store.myshopify.com/products/env-ii-unit
# https://docs.m5stack.com/#/en/unit/envII?id=comparison-between-sht30-and-dht12
##

##
# SHT30
# https://esphome.io/components/sensor/sht3xd.html
  - platform: sht3xd
    temperature:
      name: "SHT30 Temperature"
    humidity:
      name: "SHT30 Humidity"
      id: sht30_humidity
    address: 0x44
    update_interval: 60s

##
# BMP280
# https://esphome.io/components/sensor/bmp280.html?highlight=bmp280
  - platform: bmp280
    temperature:
      name: "BMP280 Temperature"
      id: bme280_temperature
      oversampling: 16x
    pressure:
      name: "BMP280 Pressure"
      id: bme280_pressure
    address: 0x76
    update_interval: 60s
    
# https://esphome.io/cookbook/bme280_environment.html
  - platform: template
    name: "Altitude"
    lambda: |-
      const float STANDARD_SEA_LEVEL_PRESSURE = 1013.25; //in hPa, see note
      return ((id(bme280_temperature).state + 273.15) / 0.0065) *
        (powf((STANDARD_SEA_LEVEL_PRESSURE / id(bme280_pressure).state), 0.190234) - 1); // in meter
    update_interval: 60s
    icon: 'mdi:signal'
    unit_of_measurement: 'm'
    
  - platform: template
    name: "Absolute Humidity"
    lambda: |-
      const float mw = 18.01534;    // molar mass of water g/mol
      const float r = 8.31447215;   // Universal gas constant J/mol/K
      return (6.112 * powf(2.718281828, (17.67 * id(bme280_temperature).state) /
        (id(bme280_temperature).state + 243.5)) * id(sht30_humidity).state * mw) /
        ((273.15 + id(bme280_temperature).state) * r); // in grams/m^3
    accuracy_decimals: 2
    update_interval: 60s
    icon: 'mdi:water'
    unit_of_measurement: 'g/m³'
    
  - platform: template
    name: "Dew Point"
    lambda: |-
      return (243.5*(log(id(sht30_humidity).state/100)+((17.67*id(bme280_temperature).state)/
      (243.5+id(bme280_temperature).state)))/(17.67-log(id(sht30_humidity).state/100)-
      ((17.67*id(bme280_temperature).state)/(243.5+id(bme280_temperature).state))));
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'