Clemens, What you suggest seems reasonable. I would think the required heater sleep period would be a variable based on the thermal characteristics of the PCB. This could be predetermined through testing and applied as a constant to set the sleep period. If the period is relatively quick, the temperature could be measured in real time to determine the point of stability before applying as a control reading. In my application (HVAC room monitoring and control) temperature would have to take priority over PM and GAS detection, so the cool down period would have to be fast to maintain room temperature. A small fan could accelerate this.
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