Sensor data processing and output control whit LAMBDA

luca_orlandi · January 12, 2025, 8:43am

I have an ESP32-C3 with two inlet temperature sensors connected and a fan controlled in speed via pwm.
What I would like to do is control the fan based on the temperature difference of the two sensors.
But I’m not succeeding, mainly because I don’t understand how to pass the sensor data from yalm to c++(lambda) and vice versa. Copy below what I wrote, can you help me better understand how to use the lambda function?

esphome:
  name: ventola-terzo-piano
  friendly_name: Ventola terzo piano

esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "***"

ota:
  - platform: esphome
    password: "****"

wifi:
  networks:
    - ssid: !secret wifi_ssid
      password: !secret wifi_password

    - ssid: !secret wifi_ssid1
      password: !secret wifi_password1

    - ssid: !secret wifi_ssid2
      password: !secret wifi_password2

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

captive_portal:

i2c:
  sda: GPIO01
  scl: GPIO02
  scan: True

output:
  - platform: ledc #esp8266_pwm
    pin: GPIO00
    frequency: 1000 Hz
    id: pwm_output

sensor:
  - platform: bmp280_i2c
    temperature:
      name: T_Ext
    pressure:
      name: P_Ext
    address: 0x76
    update_interval: 60s

  - platform: aht10
    #variant: AHT10
    temperature:
      name: T_int
    humidity:
      name: H_Int
    address: 0x38
    update_interval: 61s
  
  - platform: template 
    sensors: 
      temperature_difference: 
        friendly_name: "Differenza di temperatura" 
        unit_of_measurement: '°C'
        value_template: 
          "{{states('sensor.ventola_terzo_piano_t_int') | float - states('sensor.ventola_terzo_piano_t_ext') | float}}  

fan:
  - platform: speed
    output: pwm_output
    name: ventola
    on_speed_set:
      - logger.log:
          format: "Fan Speed was changed to %d!"
          args: pwm_output

Mahko_Mahko · January 12, 2025, 10:25am

Well to start you need to use the ESPHOME not the Home Assistant syntax.

luca_orlandi · January 12, 2025, 11:00am

Ok, I’ve correct this part

But now, how i can pass the value of return to pwm_output?

esphome:
  name: ventola-terzo-piano
  friendly_name: Ventola terzo piano

esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "***"

ota:
  - platform: esphome
    password: "***"

wifi:
  networks:
    - ssid: !secret wifi_ssid
      password: !secret wifi_password

    - ssid: !secret wifi_ssid1
      password: !secret wifi_password1

    - ssid: !secret wifi_ssid2
      password: !secret wifi_password2

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

captive_portal:

i2c:
  sda: GPIO01
  scl: GPIO02
  scan: True

output:
  - platform: ledc #esp8266_pwm
    pin: GPIO00
    frequency: 1000 Hz
    id: pwm_output

sensor:
  - platform: bmp280_i2c
    temperature:
      name: T_Ext
      id: t_ext
    pressure:
      name: P_Ext
    address: 0x76
    update_interval: 60s

  - platform: aht10
    #variant: AHT10
    temperature:
      name: T_int
      id: t_int
    humidity:
      name: H_Int
    address: 0x38
    update_interval: 61s
  
  - platform: template
    name: "Template Sensor"
    lambda: |-
      if ((((id(t_ext).state)-(id(t_int).state)) >= 2) && (((id(t_ext).state)-(id(t_int).state)) < 3)){
        return 30;
      } 
      if ((((id(t_ext).state)-(id(t_int).state)) >= 3) && (((id(t_ext).state)-(id(t_int).state)) < 5)){
        return 100;
      } 
      if (((id(t_ext).state)-(id(t_int).state)) >= 5){
        return 250;
      } else {
        return 0;
      }
    update_interval: 60s

fan:
  - platform: speed
    output: pwm_output
    name: ventola
    on_speed_set:
      - logger.log:
          format: "Fan Speed was changed to %d!"
          args: pwm_output

Karosm · January 12, 2025, 11:32am

Add this to the end of your template sensor lambda call

auto call = id(fan1).turn_on();
call.set_speed(x);
call.perform();

and give id to your fan component:
id: fan1

luca_orlandi · January 12, 2025, 11:55am

I had read about this call on a documentation, but I never understood completely. by the way I Correct the yalm configuration in this way but the output never change…

i2c:
  sda: GPIO01
  scl: GPIO02
  scan: True

output:
  - platform: ledc #esp8266_pwm
    pin: GPIO00
    frequency: 1000 Hz
    id: pwm_output

sensor:
  - platform: bmp280_i2c
    temperature:
      name: T_Ext
      id: t_ext
    pressure:
      name: P_Ext
    address: 0x76
    update_interval: 60s

  - platform: aht10
    #variant: AHT10
    temperature:
      name: T_int
      id: t_int
    humidity:
      name: H_Int
    address: 0x38
    update_interval: 61s
  
  - platform: template
    name: "Template Sensor"
    lambda: |-
      int x = 0;
      if ((((id(t_ext).state)-(id(t_int).state)) >= 2) && (((id(t_ext).state)-(id(t_int).state)) < 3)){
        return 30;
      } 
      if ((((id(t_ext).state)-(id(t_int).state)) >= 3) && (((id(t_ext).state)-(id(t_int).state)) < 5)){
        return 100;
      } 
      if (((id(t_ext).state)-(id(t_int).state)) >= 5){
        return 250;
      } else {
        return 0;
      }
      auto call = id(fan1).turn_on();
      call.set_speed(x);
      call.perform(); 
    update_interval: 60s

fan:
  - platform: speed
    output: pwm_output
    name: ventola
    id: fan1
    on_speed_set:
      - logger.log:
          format: "Fan Speed was changed to %d!"
          args: pwm_output

Karosm · January 12, 2025, 12:06pm

Afaik as default fan speed is 0-100.
Set the update interval to few seconds (for debugging) and observe what you get on log.

luca_orlandi · January 12, 2025, 12:14pm

On a log it works properly. But the output work only malualli if I switch the output on. And when it’s on is at the maximum out, it never change whith the Return value display on a log.

Ps. i change the value of return from 250 to 100 and 100 to 50.

Karosm · January 12, 2025, 12:32pm

So you say it’s updating the fan speed on fan component but not the pwm on output component??

You don’t want to set int x=0;

In case it’s not updating the fan speed with that lambda call, try like this:

platform: template
    name: "Template Sensor"
    lambda: |-
      if ((((id(t_ext).state)-(id(t_int).state)) >= 2) && (((id(t_ext).state)-(id(t_int).state)) < 3)){
        return 30;
      } 
      if ((((id(t_ext).state)-(id(t_int).state)) >= 3) && (((id(t_ext).state)-(id(t_int).state)) < 5)){
        return 50;
      } 
      if (((id(t_ext).state)-(id(t_int).state)) >= 5){
        return 100;
      } else {
        return 0;
      }
    on_value:
      then:
        - fan.turn_on:
            id: fan1
            speed: !lambda "return x;"   
    update_interval: 60s

luca_orlandi · January 12, 2025, 1:19pm

I have setted x=0; because compiling ask me to declare…

So I try the new version but it give me back an error… but I indent correctly

- platform: template
    name: "Template Sensor"
    lambda: |-
      if ((((id(t_ext).state)-(id(t_int).state)) >= 2) && (((id(t_ext).state)-(id(t_int).state)) < 3)){
        return 30;
      } 
      if ((((id(t_ext).state)-(id(t_int).state)) >= 3) && (((id(t_ext).state)-(id(t_int).state)) < 5)){
        return 50;
      } 
      if (((id(t_ext).state)-(id(t_int).state)) >= 5){
        return 100;
      } else {
        return 0;
      }
      //auto call = id(fan1).turn_on();
      //call.set_speed(x);
      //call.perform(); 
    on_value:
      then:
        - fan.turn_on:
          id: fan1
          speed: !lambda "return x;"
    update_interval: 10s

sensor.template: [source /config/esphome/ventola-terzo-piano.yaml:71]
  platform: template
  name: Template Sensor
  lambda: |-
    if ((((id(t_ext).state)-(id(t_int).state)) >= 2) && (((id(t_ext).state)-(id(t_int).state)) < 3)){
      return 30;
    } 
    if ((((id(t_ext).state)-(id(t_int).state)) >= 3) && (((id(t_ext).state)-(id(t_int).state)) < 5)){
      return 50;
    } 
    if (((id(t_ext).state)-(id(t_int).state)) >= 5){
      return 100;
    } else {
      return 0;
    }
    //auto call = id(fan1).turn_on();
    //call.set_speed(x);
    //call.perform(); 
  on_value: 
    then: 
      
Cannot have two actions in one item. Key 'fan.turn_on' overrides 'id'! Did you forget to indent the block inside the fan.turn_on?.
      - fan.turn_on: 
        id: fan1
        speed: !lambda |-

Maybe I have to move all the lambda code on a speed: !lambda |- … ?

Karosm · January 12, 2025, 1:25pm

remove those lines, you are not with arduino ide…
And you didn’t answer my first question of my previous post!

luca_orlandi · January 12, 2025, 1:43pm

I make a step back and I reintegrated auto call function and this is the log

[14:39:37][D][sensor:094]: 'Template Sensor': Sending state 30.00000  with 1 decimals of accuracy
[14:39:40][D][sensor:094]: 'T_int': Sending state 20.48111 °C with 2 decimals of accuracy
[14:39:40][D][sensor:094]: 'H_Int': Sending state 34.09138 % with 2 decimals of accuracy
[14:39:40][W][component:170]: Component aht10.sensor cleared Warning flag
[14:39:43][D][bmp280.sensor:182]: Got temperature=24.8°C pressure=945.5hPa
[14:39:43][D][sensor:094]: 'T_Ext': Sending state 24.81398 °C with 1 decimals of accuracy
[14:39:43][D][sensor:094]: 'P_Ext': Sending state 945.52264 hPa with 1 decimals of accuracy
[14:39:43][W][component:170]: Component bmp280_base cleared Warning flag
[14:39:48][D][sensor:094]: 'Template Sensor': Sending state 50.00000  with 1 decimals of accuracy
[14:39:50][D][sensor:094]: 'T_int': Sending state 20.55969 °C with 2 decimals of accuracy
[14:39:50][D][sensor:094]: 'H_Int': Sending state 34.61981 % with 2 decimals of accuracy
[14:39:52][D][bmp280.sensor:182]: Got temperature=24.2°C pressure=945.5hPa
[14:39:52][D][sensor:094]: 'T_Ext': Sending state 24.16320 °C with 1 decimals of accuracy
[14:39:52][D][sensor:094]: 'P_Ext': Sending state 945.45013 hPa with 1 decimals of accuracy
[14:39:54][D][fan:021]: 'ventola' - Setting:
[14:39:54][D][fan:024]:   State: OFF
[14:39:54][D][fan:120]: 'ventola' - Sending state:
[14:39:54][D][fan:121]:   State: OFF
[14:39:54][D][fan:123]:   Speed: 100
[14:39:55][D][fan:021]: 'ventola' - Setting:
[14:39:55][D][fan:024]:   State: ON
[14:39:55][D][fan:120]: 'ventola' - Sending state:
[14:39:55][D][fan:121]:   State: ON
[14:39:55][D][fan:123]:   Speed: 100
[14:39:57][D][fan:021]: 'ventola' - Setting:
[14:39:57][D][fan:024]:   State: OFF
[14:39:57][D][fan:120]: 'ventola' - Sending state:
[14:39:57][D][fan:121]:   State: OFF
[14:39:57][D][fan:123]:   Speed: 100
[14:39:58][D][fan:021]: 'ventola' - Setting:
[14:39:58][D][fan:024]:   State: ON
[14:39:58][D][fan:120]: 'ventola' - Sending state:
[14:39:58][D][fan:121]:   State: ON
[14:39:58][D][fan:123]:   Speed: 100
[14:39:59][D][sensor:094]: 'Template Sensor': Sending state 50.00000  with 1 decimals of accuracy
[14:40:00][D][sensor:094]: 'T_int': Sending state 20.55607 °C with 2 decimals of accuracy
[14:40:00][D][sensor:094]: 'H_Int': Sending state 33.83141 % with 2 decimals of accuracy
[14:40:01][D][bmp280.sensor:182]: Got temperature=23.6°C pressure=945.4hPa
[14:40:01][D][sensor:094]: 'T_Ext': Sending state 23.59367 °C with 1 decimals of accuracy
[14:40:01][D][sensor:094]: 'P_Ext': Sending state 945.43341 hPa with 1 decimals of accuracy
[14:40:10][D][bmp280.sensor:182]: Got temperature=23.2°C pressure=945.4hPa
[14:40:10][D][sensor:094]: 'T_Ext': Sending state 23.24406 °C with 1 decimals of accuracy
[14:40:10][D][sensor:094]: 'P_Ext': Sending state 945.42932 hPa with 1 decimals of accuracy
[14:40:10][D][sensor:094]: 'T_int': Sending state 20.56618 °C with 2 decimals of accuracy
[14:40:10][D][sensor:094]: 'H_Int': Sending state 33.64458 % with 2 decimals of accuracy
[14:40:11][D][sensor:094]: 'Template Sensor': Sending state 30.00000  with 1 decimals of accuracy
[14:40:20][D][bmp280.sensor:182]: Got temperature=23.0°C pressure=nanhPa
[14:40:20][D][sensor:094]: 'T_Ext': Sending state 22.98313 °C with 1 decimals of accuracy
[14:40:20][D][sensor:094]: 'P_Ext': Sending state nan hPa with 1 decimals of accuracy

the [fan:****] is me that turn off and on the output
But in other case the output was stable on or off and never change

Karosm · January 12, 2025, 1:56pm

So it didn’t update the fan.
Then try the code on my post#8. What you get on log…?

luca_orlandi · January 12, 2025, 1:59pm

I haven’t a log because fail during compiling

Cannot have two actions in one item. Key 'fan.turn_on' overrides 'id'! Did you forget to indent the block inside the fan.turn_on?.

Karosm · January 12, 2025, 2:02pm

did you remove those 3 call lines from lamda??

luca_orlandi · January 12, 2025, 2:05pm

Yes I do
And I declared int x; without 0

Karosm · January 12, 2025, 2:06pm

so post the yaml…

luca_orlandi · January 12, 2025, 2:11pm

- platform: template
    name: "Template Sensor"
    lambda: |-
      if ((((id(t_ext).state)-(id(t_int).state)) >= 2) && (((id(t_ext).state)-(id(t_int).state)) < 3)){
        return 30;
      } 
      if ((((id(t_ext).state)-(id(t_int).state)) >= 3) && (((id(t_ext).state)-(id(t_int).state)) < 5)){
        return 50;
      } 
      if (((id(t_ext).state)-(id(t_int).state)) >= 5){
        return 100;
      } else {
        return 0;
      }
    on_value:
      then:
        - fan.turn_on:
          id: fan1
          speed: !lambda "return x;"
    update_interval: 11s

fan:
  - platform: speed
    output: pwm_output
    name: ventola
    id: fan1
    on_speed_set:
      - logger.log:
          format: "Fan Speed was changed to %d!"
          args: pwm_output

Karosm · January 12, 2025, 2:15pm

it’s missing indentation for id and speed

luca_orlandi · January 12, 2025, 2:20pm

Sorry.
Now it work.
Can I ask 1 more question? or maybe I have to create another post…
If I want to use a data from another device like a temperature I have only to declare the ID setted on that device?

Karosm · January 12, 2025, 2:24pm

Good!
Indentations are pain in the ass.

“from another device” means what exactly? Something not connected to that Esphome? Or?