Cold White + Warm White Light - get/change color temperature request

[nekajcasa]

I am facing the next problem. With ESP I want to control cwww LED with 5 buttons (on/off, increase and decrease brightness, increase and decrease color temperature(CT)). While the brightness can be easily controlled with the -light.dim_relative:relative_brightness command, there is no command to change the CT - e.g. to lower it by 50 K when the button is pressed.

I tried to solve this problem by storing the current CT in golobal variable and then updating it when the color temperature changes with lambda function call.set_color_temperature(id(global_color_temperature)). This works fine until I change the CT with the app. Then the golobal variable is not updated and when I change the brightness again via ESP, it quickly jumps to the last value stored in the golbal variable...

I am new to home automation, so is there something I am missing here? A command to retrieve current CT (using YAML or Lambda) would solve a lot of problems, since I would not have to resort to the global variable. An even better solution would be a function similar to light.dim_relative which would allow us to change the CT in increments, say for 50K.

Thank you very much for your help!

[ssieb]

You can get the current settings with a lambda. They are in the .remote_values instance variable. You can find details in the apiref link at the bottom of the light docs.

[nekajcasa]

Thank you, that worked for me. Here is lambda function I ended up using, in case it helps anyone:

auto call = id(cwww_light).turn_on();
call.set_color_mode(light::ColorMode::COLOR_TEMPERATURE);
float current_ct = id(cwww_light).remote_values.get_color_temperature();
float new_ct = current_ct + 5.0;
new_ct = std::min(new_ct, 500.0f); // Ensure new CT doesn't exceed max
new_ct = std::max(new_ct, 153.0f); // Ensure new CT doesn't go below min
call.set_color_temperature(new_ct);
call.set_transition_length(0);
call.perform();

[ssieb]

float new_ct = clamp(current_ct + 5.0f, 153.0f, 500.0f);