ESPHome config for Sonoff Basic Relay + BME280 Sensor I2C

sonoff-sw1-bme.yaml

substitutions:
  device_description: "Sonoff Basic with BME280 Outdoor"
  device_name: "sonoff-sw1"

esphome:
  name: ${device_name}
  comment: "${device_description}"
  friendly_name: Sonoff SW1

esp8266:
  board: esp8285

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: !secret api_encryption_key

ota:
  platform: esphome
  password: !secret ota_password

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Sonoff-Sw1-Bme Fallback Hotspot"
    password: !secret ota_password

captive_portal:

text_sensor:
  # Uptime Human Readable
  - platform: template
    name: Uptime HR
    entity_category: "diagnostic"
    id: uptime_human
    icon: mdi:clock-start

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO0
      mode:
        input: true
        pullup: true
      inverted: true
    name: "Button"
    on_press:
      - switch.toggle: relay

switch:
  - platform: gpio
    name: "Relay"
    pin: GPIO12
    id: relay

status_led:
  pin:
    number: GPIO13
    inverted: yes

i2c:
  sda: GPIO3
  scl: GPIO1
  scan: True
     
sensor:
  - platform: bme280_i2c
    temperature:
      name: "BME280 Temperature"
      id: bme280_temperature
    pressure:
      name: "BME280 Pressure"
      id: bme280_pressure
    humidity:
      name: "BME280 Relative Humidity"
      id: bme280_humidity
    address: 0x76
    update_interval: 60s
  - platform: absolute_humidity
    name: "Absolute Humidity"
    temperature: bme280_temperature
    humidity: bme280_humidity
  - platform: template
    name: "Dew Point"
    lambda: |-
      return (243.5*(log(id(bme280_humidity).state/100)+((17.67*id(bme280_temperature).state)/
      (243.5+id(bme280_temperature).state)))/(17.67-log(id(bme280_humidity).state/100)-
      ((17.67*id(bme280_temperature).state)/(243.5+id(bme280_temperature).state))));
    unit_of_measurement: °C
    icon: 'mdi:thermometer-alert'

  # Uptime sensor.
  - platform: uptime
    name: "Uptime"
    entity_category: "diagnostic"
    update_interval: 300s
    id: esp_uptime
    on_raw_value:
      then:
        - text_sensor.template.publish:
            id: uptime_human
            state: !lambda |-
              int seconds = round(id(esp_uptime).raw_state);
              int days = seconds / (24 * 3600);
              seconds = seconds % (24 * 3600);
              int hours = seconds / 3600;
              seconds = seconds % 3600;
              int minutes = seconds /  60;
              seconds = seconds % 60;
              return (
                (days ? String(days) + "d " : "") +
                (hours ? String(hours) + "h " : "") +
                (minutes ? String(minutes) + "m " : "") +
                (String(seconds) + "s")
              ).c_str();   

  # WiFi Signal sensor.
  - platform: wifi_signal
    name: "WiFi Signal dB"
    id: wifi_signal_db
    entity_category: "diagnostic"
    update_interval: 60s
  - platform: copy # Reports the WiFi signal strength in %
    source_id: wifi_signal_db
    name: "WiFi Signal Percent"
    filters:
        - lambda: return min(max(2 * (x + 100.0), 0.0), 100.0);
    unit_of_measurement: "%"
    entity_category: "diagnostic"
              
# Enable Web server.
web_server:
  port: 80