Pulse counter

[voicevon]

I am using pulse sensor, the value unit is "pulse/min". I hope there are two measure unit. First is "Total pulses count" ,it is for "How many pulses the sensor has caught". Second is "Rate/Ratio", Just same requirement as currently what the pulse sensor is doing. Further more, I want the third value like "Acceleration", to show how much it's going faster/slower.
I tried to modify the code, But it should be one GPIO connected, Like the behavior of DHT-11, two sensors with one wire. This will be a challenge for me. @OttoWinter , Do you think my idea is doable?
I know we should consider about the counter overflow, power-down, might be other troubles I don't know right now.

BTW: one document error at https://esphomelib.com/api/sensor/pulse_counter.html at "Example usage"

strom_warme.mqtt->set_unit_of_measurement("kW");
strom_warme.mqtt->clear_filters();
strom_warme.mqtt->add_multiply_filter(0.06f); // convert from Wh pulse to kW

the mqtt is wrong, should be pcnt.

[OttoWinter]

Yes, it is possible:

sensor:
  - platform: pulse_counter
    filters:
      - lambda: |-
          static float total_value = 0.0;
          // 0.25 because of update_interval 15s
          total_value += x * 0.25;
          return total_value;

The acceleration would be more or less the same, but I'll leave it as an exercise to the reader :P

[voicevon]

Yes, Lambda can convert from "pulse/min" to "Total pulse count". Saying, I can only get one of them, I got this, I lost that. But my request is： The sensor provides two or three values that they represent different meaning at the same time.

[OttoWinter]

Ok, now I understand, so you want to have all three units show up as sensor at the same time.

sensor:
- platform: pulse_counter
  name: "Pulses per minute"
  id: pulse
  filters:
- platform: template
  name: "Total pulses"
  lambda: |-
    static float total_value = 0.0;
    // 0.25 because of update_interval 15s
    total_value += id(pulse).value * 0.25;
    return total_value;
- platform: template
  name: "Pulse Acceleration"
  lambda: |-
    // ...

In pure C++ it would be similar, just with the use of the TemplateSensor class.

[voicevon]

I am not able to use Yaml right now. I read a lot source code of TemplateSensor, but still can't archive . The main reason is I don't know how to write an instance of
void set_template(std::function<optional<float>()> &&f)
Could you give a two/three lines example? I guess the code should be like below. Thanks.

   auto water= App.make_pulse_counter_sensor("flow_per_min", GPIOInputPin( 18,INPUT_PULLUP));  
        water.pcnt->clear_filters();  
 auto total = App.make_template_sensor("total_flow");
 total .template_->set_template(&& water.pcnt->get_value());  //My target line, right?
total .template_->add_filter(.....)

[voicevon]

I got it .

  Application::MakeTemplateSensor target = App.make_template_sensor("target",2000);
      target.template_->set_template([=]() -> optional<float> {
      static float result = 0.0;
      result = source->value + 123;   //result = anyfunction( source->value);
      return result; 
  });