BBQ automatic control circuit with wifi module

The best bbq temperature controller uses PID control of fan speed in response to the error signal created by the difference between the bbq grill temperature setpoint and the measured temperature at the bbq grill level as measured by the grill temperature probe.
https://tengdaelectronics.com/wp-content/uploads/2023/04/BBQ-automatic-controller.jpg
Control of the rate of temperature change is achieved by a combination of fan speed controlled by the bbq fan controller and lower vent opening – the initial rate of change should be regulated at 6 degrees C per minute below the set point and 2 degrees C per minute above the setpoint.

Additional control of the upper vent in the event that conditions in the diagram cannot be met – upper vent opening will be reduced to choke off air-flow through the bbq grill.

In the event that the BBQ lid is opened, resulting in a sudden temperature drop, the remote control bbq should record the event and attempt to recover temperature at the rate indicated in the diagram.