ESPHome, generic thermostat, Nextion display and target temperature

@Morpheas1983 wrote:

Hello everyone,

I hope I am posting at the right place… This is my first post!

after searching for houres, and not finding any helpful posts, i would like to share my problem with the community.

I am trying to set up a custome thermostate, using a nodumcu (through ESPHome) a Nextion display and a Generic Thermostat from Home Assistant.

The plan is the following:

1. display the current temperature, humidity, and target temperature to the Nextion Display
2. display the current temperature, humidity, and target temperature to the thermostate card in lovelace
3. “conect” the target temperature of nextion display and thermostat card, so when changing the target temperature from the display, the lovelace card is being change as well and vice versa.

So far, 1 and 2 are working fine, but I am having difficulties on number 3.

Following are the YAML files of the ESPHome and the Home Assistant configuration

ESPHome YAML:

esphome:
  name: esp2
  platform: ESP8266
  board: nodemcuv2

wifi:
  ssid: "***"
  password: "****"
  manual_ip:
    static_ip: 192.168.1.113
    gateway: 192.168.1.1
    subnet: 255.255.255.0
    dns1: 192.168.1.1
    dns2: 192.168.1.1

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

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:

sensor:
  - platform: dht
    pin: D3
    model: dht11    
    temperature:
      name: "Thermostat Temperature"
      id: therm_temp
    humidity:
      name: "Thermostat Humidity"
      id: therm_hum
    update_interval: 30s
    
  - platform: homeassistant
    id: temperature_thermostat
    entity_id: sensor.thermostat_temperature
  - platform: homeassistant
    id: humidity_thermostat
    entity_id: sensor.thermostate_humidity
    
  - platform: template
    name: "Set Temperature"
    lambda: |-
      return {id(set_temp)};
    update_interval: 1s
  
switch:
  - platform: gpio
    name: "Heater"
    id: heater
    pin: D5
    inverted: yes
    
binary_sensor:
  - platform: gpio
    pin:
      number: D7
      mode: INPUT_PULLUP
      inverted: yes
    id: 'bouton_heater'
    name: "Bouton Heater"
    on_state:
      then:
        - switch.toggle: heater
        
  - platform: nextion
    page_id: 0
    component_id: 6
    id: minus_set_temp
    name: "Minus Set Temperature"
    on_press:
      lambda: |-
        id(set_temp) = id(set_temp) - 1;
        if (id(set_temp) == 14){
          id(set_temp) = 15;
        }
          
  - platform: nextion
    page_id: 0
    component_id: 5
    id: plus_set_temp
    name: "Plus Set Temperature"
    on_press:
      lambda: |-
        id(set_temp) = id(set_temp) + 1;
        if (id(set_temp) == 36){
          id(set_temp) = 35;
        }
    
i2c:

display:
  - platform: nextion
    id: teplomer
    update_interval: 1s
    lambda: |-
      // Do not wait for ack (this delays the whole procedure a lot, and has no use)
      it.set_wait_for_ack(false);
      
      it.set_component_text_printf("temperature","%2.1f",id(therm_temp).state);
      it.set_component_text_printf("humidity","%2.1f",id(therm_hum).state);
      it.send_command_printf("n0.val=%d",id(set_temp));
      it.send_command_printf("n1.val=%d",id(set_temp));
   
uart:
  rx_pin: GPIO1
  tx_pin: GPIO3
  baud_rate: 9600
  
globals:
  - id: set_temp
    type: int
    initial_value: '15'
    restore_value: no

configuration YAML: (only what is relevant)

climate:
  - platform: generic_thermostat
    name: Heater
    heater: switch.heater
    target_sensor: sensor.thermostat_temperature
    min_temp: 15

So the question is, what do I have to do, in order to connect “set_temp” from the ESPHome YAML (the dispay variable) with the thermostat target temperature, so when I change, the other changes as well.

In the configuration YAML I also tryied to do this:

set_temp: '{{ ((states(''sensor.set_temperature_2'') }}'

but it does not convert to float, so no luck theire!

Any help will be much appreciate!!

Thank you in advance.

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