Thermostat / PID

[Tuckie]

Describe the problem you have/What new integration you would like

Requesting a thermostat / PID control that would allow for specifying a sensor, an output pin, and a setpoint. Bonus points for a variety of customization options such as:

• Minimum duty cycle
• Pwm vs binary output
• Auto tuning vs Kp, Ki, Kd
• Open door (lid) detector

Please describe your use case for this integration and alternatives you've tried:

Building in support for a thermostat or PID controller would allow for local control loop on a device that would not be dependent upon home assistant or the network. This would greatly increase the reliability and safety of the device.

Additional context

I have a few different uses for this. First and foremost I would like to use this for controller the blower fan on my charcoal BBQ. I would like to create a much simpler version of the HeaterMeter.

I can also see this being used on a smart switch plugged into a dumb heater fan with a simple thermometer added.

[esnil]

Love the idea! Especially the part where it becomes independent of connectivity to home assistant. Would allow for a much more robust setup where network and HA-server is not critical for operation.

[OttoWinter]

FYI, part of this already exist with the bang_bang climate controller. With that you can have a component that accurately keeps some value in a given range. It's not PID but very close.

[esnil]

FYI, part of this already exist with the bang_bang climate controller. With that you can have a component that accurately keeps some value in a given range. It's not PID but very close.

Excellent! That will do perfectly for my upcoming project! (Still support the idea of a proper PID regulator though) :)

[ifujis]

That would be great having a thermostat with a PID controller and PWM output. My use case is a fan coil based AC that has a variable speed blower (PWM controlled) and variable actuator (a valve to control chilled water flow though a radiator). It could also have different modes such as:

• Normal cooling - a valve opens proportionally to blower speed
• Drying mode - a valve is fully open while blower speed is low

[commander-chris]

+1 for a PID controller

[blademckain]

+1 for a PID controller the bang_bang controller is very useful but in some cases having a PID function is essential! For example, I would need a PID function to be associated with a photoresistor to increase / decrease the brightness of some dimmable LEDs.

It should also be fairly simple to integrate already written PID functions. For example https://playground.arduino.cc/Code/PIDLibrary/

Plx add a generic PID controller!!!

[albasee]

+2 for a PID controller!

[Nicomagno]

Yeah, I tried to edit the generated firmware in Arduino to add pid but I don't know enough to get it to work. I would be great to have it in esphome

[ifujis]

Hi Otto, Thanks a lot for the pid controller. I've been testing it in my apartment with proportional fan. all good so far. It keeps the temperature more stable now +-0.1C. Is there a way to attach two outputs to it (e.g. for a water valve too) with a coefficient between the outputs? Update: I've managed to add an additional output for fan support with auto/manual speed while the cool output is connected to a valve and been testing it for a few days. Some points for improvement:

• Integral term should not be accumulated when the climate is off.
• It's better to make heat only and cool only modes utilizing PID controller value for output rather than setting full output. If the system supports only one mode(Heat or Cool), auto mode is disabled.

[pierreh]

I was wondering when can we have the PID climate controller available in the official release? I am planning to implement a heater with a PWM controlled fan.

[maximoei]

Current PID only supports Float outputs, would be great if Binary could also be supported

[glmnet]

This FR is closed by https://github.com/esphome/esphome/pull/885 if you want something else please open new PR.