Freeform weather station sculpture

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Let me share my latest fun project. A freeform sculpture made with brass wires, D1 mini and some other components. It measures the humidity and temperature by two different sensors. It also has two indicator LED’s which show the battery percentage. The sculpture works on an 18650 battery which lasts for about two months.


I integrated the sculpture in Home Assistant by using Esphome with the following configuration:

esphome:
  name: freeform sculpture
  platform: ESP8266
  board: d1_mini
  on_boot:
    priority: 100.0
    then:
      - if:
          condition:
            lambda: 'return ((id(voltage).state /3.3) * 100.00) > 50;'
          then:
            - logger.log: "The sensor value is above 85%! Turn green leds on"
            - light.turn_on: green
            - delay: 2s
            - light.turn_off: green
      - if:
          condition:
            lambda: 'return ((id(voltage).state /3.3) * 100.00) < 50;'
          then:
            - logger.log: "The sensor value is beneath 60%! Turn blue leds on"
            - light.turn_on: blue
            - delay: 2s
            - light.turn_off: blue
   
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  power_save_mode: light
  fast_connect: true

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Freeform"
    password: "xxxxx"

captive_portal:

# Enable logging
logger:

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

ota:
  password: !secret ota_password
  
# Enable Web server.
web_server:
  port: 80

deep_sleep:
  run_duration: 29min
  sleep_duration: 1min

i2c:
  sda: D2
  scl: D1
  scan: True

dallas:
  - pin: D5


binary_sensor:
  - platform: status
    name: "Freeform status"

sensor:
  - platform: adc
    pin: A0
    id: "voltage"
    update_interval: 15s
    internal: true
    filters:
      - multiply: 3.3

  - platform: template
    name: "freeform_voltage"
    unit_of_measurement: 'V'
    icon: "mdi:battery-50"
    update_interval: 15s
    accuracy_decimals: 2
    lambda: |-
      return (id(voltage).state);      

  - platform: template
    name: "freeform_battery_level"
    unit_of_measurement: '%'
    icon: "mdi:battery-50"
    update_interval: 15s
    accuracy_decimals: 2
    lambda: |-
      return ((id(voltage).state /3.3) * 100.00);

  - platform: template
    name: "freeform_battery_level_calibrated"
    unit_of_measurement: '%'
    icon: "mdi:battery-50"
    update_interval: 15s
    accuracy_decimals: 2
    lambda: |-
      return ((id(voltage).state /3.3) * 100.00);
    filters:
      - calibrate_linear:
          # Map 0.0 (from sensor) to 0.0 (true value)
          - 48.0 -> 0.0
          - 81.15 -> 100.0

  - platform: hdc1080
    temperature:
      name: "Freeform - HDC1080 Temperature"
      id: temp
    humidity:
      name: "Freeform - HDC1080 Humidity"
      id: humi
    update_interval: 20s

  - platform: dallas
    id: "DS18B20_temp"
    address: 0x00011939640DDB28
    name: "Freeform - DS18B20 temperature"
    accuracy_decimals: 2

output:
  - platform: esp8266_pwm
    id: green_led
    pin: D7
  - platform: esp8266_pwm
    id: blue_led
    pin: D8

light: 
  - platform: monochromatic
    name: "green led"
    id: "green"
    output: green_led
    default_transition_length: 3s
  
  - platform: monochromatic
    name: "blue led"
    id: "blue"
    output: blue_led
    default_transition_length: 3s

I will add an BMP280 later.

I hope this post will inspire someone else to make a freeform sculpture. If so, please post your result!

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