OT Not communicating

[serhat-ozkara]

Hello @rsciriano ,

I've successfully uploaded bin file, but there's no opentherm communication with boiler. May be a pin configuration issue?

I'm using Ihor's adapter

[rsciriano]

Hi @serhat-ozkara, the pins configuratios is in opentherm_component.h, review this and change it with your values

[rsciriano]

@serhat-ozkara, also you can use the current pins

const int inPin = D5; 
const int outPin = D6; 

[serhat-ozkara]

@rsciriano Hello,

I managed to get it working by defining

const int inPin = D2; const int outPin = D1;

Now opentherm works!
But OT values from boiler seems to be not working:

[rsciriano]

@serhat-ozkara try to change the constructor of OpenthermComponent class

from

  OpenthermComponent(): PollingComponent(15000) {

  }

to

  OpenthermComponent(): PollingComponent(3000) {

  }

[serhat-ozkara]

@rsciriano Actually, I noticed this on opentherm_component.h:

`// Read sensor values
/*
float boilerTemperature = ot.getBoilerTemperature();
float ext_temperature = getExternalTemperature();
float pressure = getPressure();
float modulation = getModulation();

// Publish sensor values
//flame->publish_state(isFlameOn); 
external_temperature_sensor->publish_state(ext_temperature);
return_temperature_sensor->publish_state(return_temperature);
boiler_temperature->publish_state(boilerTemperature);
pressure_sensor->publish_state(pressure);
modulation_sensor->publish_state(modulation);
*/`

They're all commented-out :)

[rsciriano]

@rsciriano Actually, I noticed this on opentherm_component.h:

`// Read sensor values
/*
float boilerTemperature = ot.getBoilerTemperature();
float ext_temperature = getExternalTemperature();
float pressure = getPressure();
float modulation = getModulation();

// Publish sensor values
//flame->publish_state(isFlameOn); 
external_temperature_sensor->publish_state(ext_temperature);
return_temperature_sensor->publish_state(return_temperature);
boiler_temperature->publish_state(boilerTemperature);
pressure_sensor->publish_state(pressure);
modulation_sensor->publish_state(modulation);
*/`

They're all commented-out :)

Yes, I commented that code because I tried without the opentherm adapter. The important thing is the heating climate and return temperature values.

[serhat-ozkara]

Hello again @rsciriano
I got it working with both uncommenting those lines & reducing polling to 3000. The values on the screenshot I marked are not changing and I get intermittent -1 values.
It seems to be working, but I had to set heating water to heat (auto turns off boiler completely), PID to auto (Heat seems to always enable boiler regardless of the temperature). Also Boiler target temp jumping from max boiler temp to 10 degrees, you can see from the screenshot.
Also there's a big delay between PID thermostat switching to heating and heating water swtiching from off to heating.
What does "termostato ambiante" switch does? Do I have to turn it on or off?

Thank you for your effort on this BTW :)

[Aliskin-Papa]

Switch "Termostato ambiante" -> calculate Target temperature without PID.

[rsciriano]

Hi @serhat-ozkara, sorry for the delay

I answer you in parts

I got it working with both uncommenting those lines & reducing polling to 3000. The values on the screenshot I marked are not changing and I get intermittent -1 values.

• Flame: was doubly commented on, will remain commented on
• Return Temperature: there could be a communication problem with the boiler. You could try this:
  • Increse the polling time from 3000 to 5000
  • Change the 160 line of code to show boilerTemperature instead of return_temperature on the climate component

  heatingWaterClimate->current_temperature = boilerTemperature;
  

It seems to be working, but I had to set heating water to heat (auto turns off boiler completely),

Yes, the auto option is not implemented

PID to auto (Heat seems to always enable boiler regardless of the temperature). Also Boiler target temp jumping from max boiler temp to 10 degrees, you can see from the screenshot.

I think it is because the PID parameters are not appropriate. You should run the Autotuning mode to get the parameters that adjust to your home.

I've tried it but it doesn't work fine.

Also there's a big delay between PID thermostat switching to heating and heating water swtiching from off to heating.

I think this is the behaviour of the PID, the behaviour of my original Baxi thermostat (OpenTherm wired) was similar.

I set it first to ON and then to AUTO.

What does "termostato ambiante" switch does? Do I have to turn it on or off?

As @Aliskin-Papa rightly says, calculate Target temperature without PID.

I was previously using the Generic Thermostat from Home Assistant, the "termostato ambiente" switch is for this