> This firmware also controls tip temperature with a PID loop, whereas a classic 'dumb' temperature-controlled soldering iron might use a thermostat with on/off

> This firmware also controls tip temperature with a PID loop, whereas a classic 'dumb' temperature-controlled soldering iron might use a thermostat with on/off control. I'd imagine on-off being perfectly fine for thermocouple-and-heater-in-tip, as you have very short feedback loop there