I'd like to use this heater element for a project I'm working on. It looks like a good product but there is unfortunately not much documentation available, but I think it's basically a simple resistive load that can operate from 230V AC. So I started to look around to see how I could control the temperature of this heater and found an interesting circuit in Power Semiconductor Applications (chapter 6.2.2) by Philips:
This circuit produces the following output:
This looks like it could do the job for me. According to the description, it is controlled by the resistance of the potentiometer R2.
Now my question is, instead of a manual potentiometer, how can I modify this circuit to control it electrically, with an MCU (microcontroller)?
Alternatively, what other circuit could I use that can be controlled using an MCU that would achieve the same ends?
Note, I'd also prefer to keep this galvanically isolated from the MCU. I believe this could be achieved using an optocoupler, but I'm not a power expert, so I'm not sure which kind I need here.
Thank you in advance for your help!