led-and-key1-esp32.yaml

##
## ESPHome configuration for led-and-key1-esp32
## * LED0 is lit if the back door autolock is enabled
## * LED1 is lit if the front door autolock is enabled
## * ..
## * BUTTON0 toggles the back door autolock enable
## * BUTTON1 toggles the front door autolock enable
## * ...
## * BUTTON6 will decrease the intensity
## * BUTTON7 will decrease the intensity
##
## The global ledkey1_display controls what is being displayed.
## if (ledkey1_display == "") the current time and temperature
## will be displayed, instead (obtained from HA).
##
## Wiring of the TM1638
##    3.3v and GND from 3.3V and GND from the microcontroller (may not be ideal?)
##    DIO on D23, GPIO34
##    CLK on D19, GPIO19
##    STB on D18, GPIO18
##

esphome:
  name: led-and-key1-esp32

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: !secret ledkey1_esp32_api_encryption

ota:
  password: !secret ota_password

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  fast_connect: true
  domain: .mylocal

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "led-and-key-1 Fallback Hotspot"
    password: !secret fallback_wifi_password

captive_portal:

##
## Use HA as a source of time.
##
time:
  - platform: homeassistant
    id: esptime

globals:
  ##
  ## The value to be displayed
  ##
  - id: ledkey1_display
    type: std::string
    restore_value: no
    initial_value: ""
  ##
  ## The value currently on the display
  ##
  - id: ledkey1_display_current
    type: std::string
    restore_value: no
    initial_value: ""
  ##
  ## The intensity of the display (0-7).
  ##
  - id: intensity
    type: int
    restore_value: yes
    initial_value: "1"

##
## Display the value in the global ledkey1_display
## or display the time and temperature if 
## (ledkey1_display == "").
##
display:
    platform: tm1638
    id: ledkey1_display_actual
    dio_pin: 23
    clk_pin: 19
    stb_pin: 18
    intensity: 1
    update_interval: 0.5s
    lambda: |-
      it.set_intensity(id(intensity));
      if (strlen(id(ledkey1_display).c_str()) == 0) {
        //
        // Nothing being displayed. Show the time and temp.
        //
        id(ledkey1_display_current).clear();
        it.print("        ");
        it.printf("%s %.0fF", id(esptime).now().strftime("%I.%M").c_str(), id(back_yard_temperature).state);
      }
      else {
        if (strcmp(id(ledkey1_display).c_str(), id(ledkey1_display_current).c_str()) != 0) {
          //
          // New text to display. Show it and remember it
          // so we don't have to show it again in the next iteration
          // of the lambda.
          //
          id(ledkey1_display_current).clear();
          id(ledkey1_display_current).append(id(ledkey1_display));
          // Clear the display and then print.
          it.print("        ");
          it.print(id(ledkey1_display).c_str());
        }
      }

sensor:
  ##
  ## HA sensors we need to do our work.
  ##
  - platform: homeassistant
    id: back_yard_temperature
    entity_id: sensor.back_yard_sensor_temperature

binary_sensor:
  ##
  ## More HA sensors we need to do our work.
  ##
  - platform: homeassistant
    id: back_door_autolock
    entity_id: input_boolean.keymaster_back_door_autolock
    publish_initial_state: true
    on_state:
      ##
      ## Observe initial state and state changes within HA.
      ##
      - if:
          condition:
              - binary_sensor.is_on: back_door_autolock
          then:
            - logger.log: "LED0 on"
            - output.turn_on: ledkey1_led_0
          else:
            - logger.log: "LED0 off"
            - output.turn_off: ledkey1_led_0
  - platform: homeassistant
    id: front_door_autolock
    entity_id: input_boolean.keymaster_front_door_autolock
    publish_initial_state: true
    on_state:
      ##
      ## Observe initial state and state changes within HA.
      ##
      - if:
          condition:
              - binary_sensor.is_on: front_door_autolock
          then:
            - logger.log: "LED2 on"
            - output.turn_on: ledkey1_led_2
          else:
            - logger.log: "LED2 off"
            - output.turn_off: ledkey1_led_2
  - platform: homeassistant
    id: back_door_sensor
    entity_id: binary_sensor.back_door_sensor
    publish_initial_state: true
    on_state:
      - if:
          condition:
              - binary_sensor.is_on: back_door_sensor
          then:
            - logger.log: "LED1 on"
            - output.turn_on: ledkey1_led_1
            - lambda: |-
                id(ledkey1_display) = "Back dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Opened";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();
          else:
            - logger.log: "LED1 off"
            - output.turn_off: ledkey1_led_1
            - lambda: |-
                id(ledkey1_display) = "Back dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Closed";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();
  - platform: homeassistant
    id: front_door_sensor
    entity_id: binary_sensor.front_door_sensor
    publish_initial_state: true
    on_state:
      - if:
          condition:
              - binary_sensor.is_on: front_door_sensor
          then:
            - logger.log: "LED3 on"
            - output.turn_on: ledkey1_led_3
            - lambda: |-
                id(ledkey1_display) = "Front dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Opened";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();
          else:
            - logger.log: "LED3 off"
            - output.turn_off: ledkey1_led_3
            - lambda: |-
                id(ledkey1_display) = "Front dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Closed";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();


  ##
  ## The eight buttons on the TM1638.
  ##
  - platform: tm1638
    name: "ledkey1 button 0"
    id: ledkey1_button_0
    key: 0
    on_click:
      ##
      ## Button 0 is pressed. Toggle back door autolock.
      ##
      - if:
          condition:
              - binary_sensor.is_on: back_door_autolock
          then:
            - logger.log: "Back door autolock disabled"
            - homeassistant.service:
                ##
                ## I thought changing ESPHome's binary_sensor.back_door_autolock
                ## should have changed the associated input_boolean.keymaster_back_door_autolock
                ## but it didn't seem to. Calling the HA service to change the value worked.
                ##
                service: "input_boolean.turn_off"
                data:
                  entity_id: "input_boolean.keymaster_back_door_autolock"
            - lambda: |-
                id(ledkey1_display) = "Back dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Autolock";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Disabled";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();
          else:
            - logger.log: "Back door autolock enabled"
            - homeassistant.service:
                service: "input_boolean.turn_on"
                data:
                  entity_id: "input_boolean.keymaster_back_door_autolock"
            - lambda: |-
                id(ledkey1_display) = "Back dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Autolock";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Enabled";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();

  - platform: tm1638
    name: "ledkey1 button 1"
    id: ledkey1_button_1
    key: 1
    on_click:
      ##
      ## Button 1 is pressed. Toggle front door autolock.
      ##
      - if:
          condition:
              - binary_sensor.is_on: front_door_autolock
          then:
            - logger.log: "Front door autolock disabled"
            - homeassistant.service:
                service: "input_boolean.turn_off"
                data:
                  entity_id: "input_boolean.keymaster_front_door_autolock"
            - lambda: |-
                id(ledkey1_display) = "Front dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Autolock";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Disabled";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();
          else:
            - logger.log: "Front door autolock enabled"
            - homeassistant.service:
                service: "input_boolean.turn_on"
                data:
                  entity_id: "input_boolean.keymaster_front_door_autolock"
            - lambda: |-
                id(ledkey1_display) = "Front dr";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Autolock";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display) = "Enabled";
            - delay: 1s
            - lambda: |-
                id(ledkey1_display).clear();
  - platform: tm1638
    name: "ledkey1 button 2"
    id: ledkey1_button_2
    key: 2
  - platform: tm1638
    name: "ledkey1 button 3"
    id: ledkey1_button_3
    key: 3
  - platform: tm1638
    name: "ledkey1 button 4"
    id: ledkey1_button_4
    key: 4
  - platform: tm1638
    name: "ledkey1 button 5"
    id: ledkey1_button_5
    key: 5
  - platform: tm1638
    name: "ledkey1 button 6"
    id: ledkey1_button_6
    key: 6
    on_click:
      ##
      ## Button 6: Decrease display intensity
      ##
      - lambda: |-
          if (id(intensity) > 0) {
            id(intensity)--;
          }
          id(ledkey1_display) = "Inten " + esphome::to_string(id(intensity));
      - delay: 1s
      - lambda: |-
          id(ledkey1_display).clear();
  - platform: tm1638
    name: "ledkey1 button 7"
    id: ledkey1_button_7
    key: 7
    on_click:
      ##
      ## Button 7: Increase display intensity
      ##
      - lambda: |-
          if (id(intensity) < 7) {
            id(intensity)++;
          }
          id(ledkey1_display) = "Inten " + esphome::to_string(id(intensity));
      - delay: 1s
      - lambda: |-
          id(ledkey1_display).clear();

##
## The LEDs. We control these elsewhere, as necessary.
##
output:
  - platform: tm1638
    # name: "ledkey1 led 0"
    id: ledkey1_led_0
    led: 0
  - platform: tm1638
    # name: "ledkey1 led 1"
    id: ledkey1_led_1
    led: 1
  - platform: tm1638
    # name: "ledkey1 led 2"
    id: ledkey1_led_2
    led: 2
  - platform: tm1638
    # name: "ledkey1 led 3"
    id: ledkey1_led_3
    led: 3
  - platform: tm1638
    # name: "ledkey1 led 4"
    id: ledkey1_led_4
    led: 4
  - platform: tm1638
    # name: "ledkey1 led 5"
    id: ledkey1_led_5
    led: 5
  - platform: tm1638
    # name: "ledkey1 led 6"
    id: ledkey1_led_6
    led: 6
  - platform: tm1638
    # name: "ledkey1 led 7"
    id: ledkey1_led_7
    led: 7

To clarify, it sounds like you want to show the value of a Home Assistant (HA) sensor, some temperature value, which we will call temp1 for our discussion. If you want to grab any sensor value that is defined in HA, refer to Kevin's example starting on line 123 (minus comments:

sensor:
  - platform: homeassistant
    id: back_yard_temperature
    entity_id: sensor.back_yard_sensor_temperature

You define a new ESPHome sensor stating it is based on one from HA. You can give it whatever ID you want to refer to in your YAML, but remember to match the HA id exactly in the entity_id field.

Let's assume you did that and your sensor has the id: "temp1".

To display that in a lambda expression, you need to get the value from the sensor and then knowing it is most likely an integer, you need to cast that to a string to display. So in your line above that goes like this:

- lambda: |-
          id(ledkey1_display) = "temp1" + esphome::to_string(id((temp_1));

You are setting the value of the variable ledkey1_display, which is a string. You are trying to assign the concatenation of the literal string "temp1" which gets displayed and what looks like the correct way to refer to the value of temp1 (assuming the underscore is a typo) and properly cast that value to a string.

My best guess, is that you just didn't properly define the value of temp1 as a sensor from HA. Feel free to share where you tried to define that if you need help,