ESPHome_thermostat_Code.yaml

esphome:
  name: "wand-thermostat-max-wz" # Name of the ESPHome device
  platform: ESP8266
  board: d1_mini

  on_boot:
    priority: -100.0
    then:
      - lambda: "id(oled_contrast).publish_state(0.4);"
      - script.execute: activate_oled1

### Change these to configure the wall thermostat ###
substitutions:
  room: "Test room" # Room name
  climate_id: "climate.test_room" # The climate entity in Home Assistant which will be used for checking and setting target temperature
  temperature_id: "Test room temperature" # sensor.${temperature_id} will be the temperature sensor in Home Assistant
  encryption_key: "xxxxxxx" # The encryption key for communicating with Home Assistant
  ota_password: "xxxxxxx" # The OTA password
  ds18b20_address: "0xbe012275d68d1028" # This address needs to be replaced with the one from the logs after first flash
### Change these to configure the wall thermostat ###

wifi:
  networks:
    - ssid: !secret wifi_ssid
      password: !secret wifi_password
# My mDNS seems to not work so this is necessary to use the ESPHome Dashboard
#  manual_ip:
#    static_ip: 192.168.2.240
#    gateway: 192.168.2.1
#    subnet: 255.255.255.0

logger:
  logs:
    sensor: none

api:
  encryption:
    key: ${encryption_key}

ota:
  password: ${ota_password}

i2c:
  frequency: 400kHz

switch:

  - platform: template
    id: brightness
    optimistic: true

  - platform: template
    id: oled1_state
    optimistic: true

binary_sensor:

  - platform: gpio
    id: button
    pin:
      number: D4
      inverted: true
    on_release:
      then:
        - if:
            condition:
              switch.is_on: oled1_state
            then:
              - switch.toggle: brightness
              - script.execute: activate_oled1
            else:
              - script.execute: activate_oled1

dallas:
  - pin: D3
    update_interval: 15s

sensor:
  - platform: template
    id: oled_contrast

  - platform: dallas
    id: internal_temperature
    address: ${ds18b20_address}
    name: ${temperature_id}
    # TODO Move offset to configuration block.
    # TODO For now I can't figure out how to do proper float casting.
    filters:
      - offset: 0.0

  - platform: rotary_encoder
    id: encoder
    pin_a:
      number: D6
      mode: INPUT_PULLUP
    pin_b:
      number: D7
      mode: INPUT_PULLUP
    on_clockwise:
      - if:
          condition:
            switch.is_on: oled1_state
          then:
            - script.execute: activate_oled1
            - if:
                condition:
                  switch.is_on: brightness
                then:
                  - sensor.template.publish:
                      id: oled_contrast
                      state: !lambda "return id(oled_contrast).state + 0.1;"
                  - lambda: |-
                      id(oled1).set_contrast( id(oled_contrast).state );
                else:
                  - homeassistant.service:
                      service: climate.set_temperature
                      data:
                        temperature: !lambda "return id(btt_target_temp).state + 0.5;"
                        entity_id: ${climate_id}

    on_anticlockwise:
      - if:
          condition:
            switch.is_on: oled1_state
          then:
            - script.execute: activate_oled1
            - if:
                condition:
                  switch.is_on: brightness
                then:
                  - sensor.template.publish:
                      id: oled_contrast
                      state: !lambda "return id(oled_contrast).state - 0.1;"
                  - lambda: |-
                      id(oled1).set_contrast( id(oled_contrast).state);
                else:
                  - homeassistant.service:
                      service: climate.set_temperature
                      data:
                        temperature: !lambda "return id(btt_target_temp).state - 0.5;"
                        entity_id: ${climate_id}

  - platform: homeassistant
    id: btt_target_temp
    entity_id: ${climate_id}
    attribute: temperature

text_sensor:

  - platform: homeassistant
    id: btt_heating_state
    entity_id: ${climate_id}
    attribute: hvac_action

display:
  - platform: ssd1306_i2c
    id: oled1
    update_interval: 1.0s
    contrast: 0.4
    model: "SH1106 128x64"
    rotation: 180
    address: 0x3C
    lambda: |-
      it.print(64, 0,  id(font1), TextAlign::TOP_CENTER, "${room}");

      it.printf(63, 4, id(font2), TextAlign::TOP_CENTER, " %.1f°", id(internal_temperature).state);
      it.printf(127, 64, id(font3), TextAlign::BASELINE_RIGHT, "Ziel:  %.1f°", id(btt_target_temp).state);

      if (id(brightness).state) {it.image(1, 49, id(bulb));} 
      else if (id(btt_heating_state).state == "idle") {it.image(1, 49, id(home_thermometer));}
      else {id(ani_fire).next_frame(); it.image(1, 49, id(ani_fire));}

animation:
  - file: "_icons/thermostat/fire.gif"
    id: ani_fire
image:
  - file: "_icons/thermostat/home-thermometer.png"
    id: home_thermometer
  - file: "_icons/thermostat/lightbulb-on-outline.png"
    id: bulb
font:
  - file: "_fonts/refsan.ttf"
    id: font1
    size: 12
  - file: "_fonts/refsan.ttf"
    id: font2
    size: 42
  - file: "_fonts/refsan.ttf"
    id: font3
    size: 13

script:
  - id: activate_oled1
    mode: restart
    then:
      - lambda: |-
          id(oled1).turn_on();
          id(oled1_state).turn_on();
      - delay: 3s
      - lambda: |-
          id(oled1).turn_off();
          id(oled1_state).turn_off();
          id(brightness).turn_off();