Trouble getting String global to be used inside lambda function

ESPHome
1

Hi all.

I’m quite new on esphome. Still learning and try to understand how all works.
Everything was going fine, until now. I need some help.

I’m playing with a ESP32_CAM. It’s already working, but still need some tuning.
But what I want to do is make a card on HomeAssistant to set some parameters of the camera.

I set brightness, saturation and contrast already, making globals and getting the values from homeassistant. This way:

globals:
  - id: brightness_atual
    type: int
    initial_value: "0"
  - id: contraste_atual
    type: int
    initial_value: "0"
  - id: saturacao_atual
    type: int
    initial_value: "0"

sensor:
  - platform: homeassistant
    id: ha_brightness
    entity_id: input_number.camera_aquario_sala_brightness
    on_value:
      then:
        if:
          condition:
              lambda: 'return id(brightness_atual) != int(x);'
          then:
            - logger.log:
                level: INFO
                format: 'Mudança no Brightness : de %d para %d'
                args: ['id(brightness_atual)', 'int(x)']
            - globals.set:
                id: brightness_atual
                value: !lambda 'return int(x);'
            - lambda: |-
                id(camera).set_brightness(x);
  - platform: homeassistant
    id: ha_contraste
    entity_id: input_number.camera_aquario_sala_contraste
    on_value:
      then:
        if:
          condition:
              lambda: 'return id(contraste_atual) != int(x);'
          then:
            - logger.log:
                level: INFO
                format: 'Mudança no Contraste : de %d para %d'
                args: ['id(contraste_atual)', 'int(x)']
            - globals.set:
                id: contraste_atual
                value: !lambda 'return int(x);'
            - lambda: |-
                id(camera).set_contrast(x);
  - platform: homeassistant
    id: ha_saturacao
    entity_id: input_number.camera_aquario_sala_saturacao
    on_value:
      then:
        if:
          condition:
              lambda: 'return id(saturacao_atual) != int(x);'
          then:
            - logger.log:
                level: INFO
                format: 'Mudança na Saturacao_atual : de %d para %d'
                args: ['id(saturacao_atual)', 'int(x)']
            - globals.set:
                id: saturacao_atual
                value: !lambda 'return int(x);'
            - lambda: |-
                id(camera).set_saturation(x);

This way, I can set thos adjustments directly from HA to reflect on the fly.
But Now, I’d like to also change resolution, whitout having to compile a new code in esphome.
So I did the same thing, adding:

- id: resolucao_atual
   type: std::string
   initial_value: '"800x600"'

- platform: homeassistant
   id: ha_resolucao
   entity_id: input_select.resolucao_da_camera_aquario_sala
   on_value:
     then:
       if:
         condition:
             lambda: 'return id(resolucao_atual) != x.c_str();'
         then:
           - logger.log:
               level: INFO
               format: 'Mudança na Resolução : de %s para %s'
               args: ['id(resolucao_atual)', 'x']
           - globals.set:
               id: resolucao_atual
               value: !lambda 'return x;'

I know the resolution cannot be changed on the fly, need a restart. But my intention here is set the resolution I want and push a button to restart ESPHOME device and apply the new resolution.

But here starts my problems:
This way I get a compiler errors about the type of my global variable and the X value on the lambda function:

/config/camera-aquario-sala.yaml:156:44: error: request for member 'c_str' in 'x', which is of non-class type 'float'
               lambda: 'return id(resolucao_atual) != x.c_str();'
                                            ^~~~~

I have tried to remove the .c_str() from x, and algo got erros.

/config/camera-aquario-sala.yaml:156:39: error: no match for 'operator!=' (operand types are 'std::__cxx11::basic_string<char>' and 'float')
               lambda: 'return id(resolucao_atual) != x;'

It gives me Tons of warnings and also the following error:

src/esphome/core/automation.h:33:46: error: no matching function for call to 'std::function<std::__cxx11::basic_string<char>(float)>::function(setup()::<lambda(float)>&)'
   TemplatableValue(F f) : type_(LAMBDA), f_(f) {}
                                              ^

I have no clue whats wrong.

2

Home assistant sensor is only for numerical values.
Try with text sensor.

3

Thanks !

I’ll try later to test. I am trying another aproach, that’s trhough API services.

So another question: which aproach is best to use (or more recommended): api services or through sensors with platform homeassistant ?

Regards.

4

I don’t know. HA sensors are more commonly used to get data from HA to esphome.

1 Like
5

looks like the HA integration is more reliable than API services. I’ll migrate then.

But I’m givving up for a while on trying to change resolution on the fly.

My intention was setting the asked resolution on a global variable and order a boot on the device. On boot, I restore that global value on the camera configuration, on boot and use it on camera settings.
But looks like I cannot use lambdas or another reference to global when defining this resolution config. So, I’ll focus on other problems and come back to this later.

Thanks.