esp32-configs/athom-sht40-sensor.yaml

substitutions:
  name: "athom-tem-hum-sensor"
  friendly_name: "Athom Temperature Humidity Sensor"
  # Allows ESP device to be automatically lined to an 'Area' in Home Assistant. Typically used for areas such as 'Lounge Room', 'Kitchen' etc
  room: ""
  device_description: "athom sht40 temperature and humidity sensor"
  project_name: "China Athom Technology.Temperature Humidity Sensor"
  project_version: "1.0.6"
  update_interval: 5s
  # Define a domain for this device to use. i.e. iot.home.lan (so device will appear as athom-smart-plug-v2.iot.home.lan in DNS/DHCP logs)
  dns_domain: ".local"
  # Set timezone of the smart plug. Useful if the plug is in a location different to the HA server. Can be entered in unix Country/Area format (i.e. "Australia/Sydney")
  timezone: ""
  # Set the duration between the sntp service polling ntp.org servers for an update
  sntp_update_interval: 6h
  # Network time servers for your region, enter from lowest to highest priority. To use local servers update as per zones or countries at: https://www.ntppool.org/zone/@
  sntp_server_1: "0.pool.ntp.org"
  sntp_server_2: "1.pool.ntp.org"
  sntp_server_3: "2.pool.ntp.org"  
  # Enables faster network connections, with last connected SSID being connected to and no full scan for SSID being undertaken
  wifi_fast_connect: "false"
  # Define logging level: NONE, ERROR, WARN, INFO, DEBUG (Default), VERBOSE, VERY_VERBOSE
  log_level: "DEBUG"
  # Enable or disable the use of IPv6 networking on the device
  ipv6_enable: "false"

  temperature_offset: "-1"
  humidity_offset: "5"
#############################ESP32C3###########################
  sht40_sda_pin: GPIO10
  sht40_scl_pin: GPIO8
  button_pin:    GPIO9
  led_pin:       GPIO21
#############################ESP32C3###########################

esphome:
  name: "${name}"
  friendly_name: "${friendly_name}"
  comment: "${device_description}"
  area: "${room}"
  name_add_mac_suffix: true
  min_version: 2025.7.0
  project:
    name: "${project_name}"
    version: "${project_version}"
  platformio_options:
    board_build.flash_mode: dio
  on_boot:
    priority: 800
    then:
      - if:
          condition:
            wifi.connected:
          then:
            - light.turn_off: led
          else:
            - script.execute: wifi_rgb_loop

esp32:
  board: esp32-c3-devkitm-1
  flash_size: 4MB
  framework:
    type: esp-idf
    version: recommended

preferences:
  flash_write_interval: 1min

api:
  # reboot_timeout: 0s

ota:
  - platform: esphome

logger:
  baud_rate: 115200
  level: ${log_level}

mdns:
  disabled: false

web_server:
  port: 80

network:
  enable_ipv6: ${ipv6_enable}

wifi:
  ap: {}
  fast_connect: "${wifi_fast_connect}"
  domain: "${dns_domain}"
  on_connect:
    then:
      - script.stop: wifi_rgb_loop
      - light.turn_off: led
  on_disconnect:
    then:
      - script.execute: wifi_rgb_loop

captive_portal:

improv_serial:

esp32_improv:
  authorizer: none

esp32_ble_tracker:
  scan_parameters:
    interval: 320ms
    window: 320ms
    active: true

bluetooth_proxy:
  active: true

dashboard_import:
  package_import_url: github://athom-tech/esp32-configs/athom-sht40-sensor.yaml

i2c:
  sda: "$sht40_sda_pin"
  scl: "$sht40_scl_pin"
  scan: true
  id: bus_a

sensor:
  - platform: sht4x
    i2c_id: bus_a
    id: sht40_sensor
    temperature:
      name: Temperature
      id: temperature_sensor
      filters:
        - offset: ${temperature_offset}
        - lambda: "return x + id(temperature_offset_selection).state;"
    humidity:
      name: Humidity
      id: humidity_sensor
      filters:
        - offset: ${humidity_offset}
        - lambda: "return x + id(humidity_offset_selection).state;"
    update_interval: ${update_interval}

  - platform: uptime
    name: "Uptime Sensor"
    id: uptime_sensor
    type:
      timestamp
    entity_category: "diagnostic"

  - platform: wifi_signal
    name: "WiFi Signal dB"
    id: wifi_signal_db
    update_interval: 60s
    entity_category: "diagnostic"

  - platform: copy
    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: "Signal %"
    entity_category: "diagnostic"
    device_class: ""

number:
  - platform: template
    name: "Temperature Offset"
    id: temperature_offset_selection
    unit_of_measurement: "°C"
    min_value: -10
    max_value: 10
    step: 0.1
    mode: box
    update_interval: never
    optimistic: true
    restore_value: true
    initial_value: 0
    icon: "mdi:thermometer"
    entity_category: config
    on_value:
      - lambda: 'id(sht40_sensor).update();'
  - platform: template
    name: "Humidity Offset"
    id: humidity_offset_selection
    unit_of_measurement: "%"
    min_value: -30
    max_value: 30
    step: 0.1
    mode: box
    update_interval: never
    optimistic: true
    restore_value: true
    initial_value: 0
    icon: "mdi:water-percent"
    entity_category: config
    on_value:
      - lambda: 'id(sht40_sensor).update();'

binary_sensor:
  - platform: status
    name: "Status"
    entity_category: diagnostic

  - platform: gpio
    pin:
      number: "$button_pin"
      mode: INPUT_PULLUP
      inverted: true
    name: "Power Button"
    disabled_by_default: true
    on_multi_click:
      - timing:
        - ON for at least 4s
        then:
          - button.press: Reset
button:
  - platform: restart
    name: "Restart"
    entity_category: config

  - platform: factory_reset
    name: "Factory Reset"
    id: Reset
    entity_category: config

  - platform: safe_mode
    name: "Safe Mode"
    internal: false
    entity_category: config

light:
  - platform: esp32_rmt_led_strip
    rgb_order: GRB
    pin: "$led_pin"
    num_leds: 1
    chipset: ws2812
    restore_mode: RESTORE_DEFAULT_OFF
    name: "Light"
    id: "led"

text_sensor:
  - platform: wifi_info
    ip_address:
      name: "IP Address"
      id: ip_address
      entity_category: diagnostic
    ssid:
      name: "Connected SSID"
      id: ssid
      entity_category: diagnostic
    mac_address:
      name: "Mac Address"
      id: mac_address
      entity_category: diagnostic

  - platform: template
    name: "Last Restart"
    id: device_last_restart
    icon: mdi:clock
    entity_category: diagnostic
    device_class: timestamp

time:
  - platform: sntp
    id: sntp_time
  # Define the timezone of the device
    timezone: "${timezone}"
  # Change sync interval from default 5min to 6 hours (or as set in substitutions)
    update_interval: ${sntp_update_interval}
  # Set specific sntp servers to use
    servers:
      - "${sntp_server_1}"
      - "${sntp_server_2}"
      - "${sntp_server_3}"
  # Publish the time the device was last restarted
    on_time_sync:
      then:
        # Update last restart time, but only once.
        - if:
            condition:
              lambda: 'return id(device_last_restart).state == "";'
            then:
              - text_sensor.template.publish:
                  id: device_last_restart
                  state: !lambda 'return id(sntp_time).now().strftime("%a %d %b %Y - %I:%M:%S %p");'

script:
  - id: wifi_rgb_loop
    mode: restart
    then:
      - logger.log: "Wi-Fi disconnected. RGB loop started"
      - while:
          condition:
            not:
              wifi.connected:
          then:
            - light.turn_on:
                id: led
                red: 100%
                green: 0%
                blue: 0%
                brightness: 100%
            - delay: 1s

            - light.turn_on:
                id: led
                red: 0%
                green: 100%
                blue: 0%
                brightness: 100%
            - delay: 1s

            - light.turn_on:
                id: led
                red: 0%
                green: 0%
                blue: 100%
                brightness: 100%
            - delay: 1s

            - light.turn_off: led
            - delay: 100ms