Firepace control with ESP

ESPHome
1

Hi!

I have a fireplace and I installed a thermocouple max6675 (inside) with an ESP32.

This thermocouple gives me the fireplace internal temperature and I would like to create a template that shows me this in a entity card:

Temp between 0° to 50° --> Fireplace OFF
Temp between 50° to 150° --> LOW TEMP, CECK THE FLAME
Temp between 150° to 300° --> Fireplace is OK

How can i get this?
Many thanks in advance

2

Do you want to template this in esphome, or home assistant?

If home assistant, what is the entity id of the temperature sensor?

If esphome, show your config.

3

I prefer in ESPHome…this is my config:

esphome:
  name: esp32_01
  platform: ESP32
  board: esp-wrover-kit
  on_loop:
    then:
      - lambda: delay(5);

wifi:
  ssid: "name"
  password: "pass"
  power_save_mode: none
  fast_connect: true
  manual_ip:
    static_ip: 192.168.1.30
    gateway: 192.168.1.1
    subnet: 255.255.255.0

logger:

api:

ota:

spi:
  miso_pin: GPIO12
  clk_pin: GPIO14

sensor:
  - platform: max6675
    name: "Temperatura Stufa"
    cs_pin: GPIO15
    update_interval: 10s
    
  - platform: wifi_signal
    name: "ESP32_01_WiFi"
    update_interval: 60s
    
  - platform: uptime
    name: "Uptime"
    id: uptime_s
    update_interval: 60s
    internal: true
4

Probably some template sensor in esphome. I’m not up on lambda notation so I’m at a loss on the code.

5 
text_sensor:
  - platform: template
    name: "Fire State"
    lambda: |-
#some if/then code
      return {"Off"};
# else if temp is over 50
      return {"Unknown - Check the flame"}
# else
      return {"OK"}
    update_interval: 15s
6

I don’t think I understand how to do it :sweat_smile:

sensor:
  - platform: max6675
    name: "Temperatura Stufa"
    cs_pin: GPIO15
    update_interval: 10s
    id: fire_temp

text_sensor:

  - platform: template
    name: "Stato Fuoco"
    lambda: |-
if (id(fire_temp).state == under 50)
      return {"Off"};
# else if temp is over 50
      return {"Unknown - Check the flame"}
# else
      return {"OK"}
    update_interval:
7

< 50

not under 50

8

Many thanks!
This is the final configuration (tonight I’ll try if it works well)

text_sensor:
#STATO FUOCO STUFA
  - platform: template
    name: "Stato Fuoco"
    lambda: |-
     if (id(fire_temp).state  < 50)
      return {"SPENTO"}
     ;else if (id(fire_temp).state  > 50)
      return {"BASSO - controllare!"}
     ;else (id(fire_temp).state  > 140)
      ;return {"NORMALE"};
    update_interval: 15s
9

That’s never going to have the state " Normal". As the > 50 test will always be true before it gets to > 140. Try this

    lambda: |-
      if (id(fire_temp).state  > 140);
        return {"NORMALE"};
      else if (id(fire_temp).state > 50);
        return {"BASSO - controllare!"};
      else;
        return {"SPENTO"};
    id: fire_state

Also rather than polling the sensor every 15 seconds, update it when the temperature changes:

sensor:
  - platform: max6675
    name: "Temperatura Stufa"
    cs_pin: GPIO15
    update_interval: 10s
    id: fire_temp
    on_value:
      then:
        - component.update: fire_state
10

Ok thanks tom, I will try this.

Can I set the different icon color for the 3 states?
For eample: red icon for state NORMALE, black icon for state SPENTO

Immagine11

11

No, I don’t think you can do that. You’d have to use card mod in home assistant.

12

Ok!

Last question, with this sensor, can I display degrees without decimals?
I would like to see 1 degree steps without decimals (now is 29.5 etc)


sensor:
  - platform: max6675
    name: "Temperatura Stufa"
    cs_pin: GPIO15
    update_interval: 10s
13

accuracy_decimals

14

Hi!
In ESPHome I created this template, which it tells me if the fire is ON (“ACCESA”) or OFF (“SPENTA”).

  - platform: template
    name: "Stato Stufa"
    icon: "mdi:fire"
    lambda: |-
     if (id(fire_temp).state  > 50)
      return {"ACCESA"}
     ;else
      return {"SPENTA"};
    update_interval: 15s

Is it possible to display a time as an output value?
For example:

....
return {"ACCESA alle 18:00"}
....
return {"SPENTA alle 23:00"}

Thanks