You can then add the CPU/MCU temperature to the temperature graph in the DWC
Click on “Extra” in the “Tools/Heaters/Extra” section at the top middle of the DWC window and checking “Show in Chart” for the MCU sensor. It will then appear as a dashed line in the temperature graph.
You can go one step further and configure the Fan2 port for the Ender 3 case fan to use the CPU temperature as a thermostatic control point, so that when it starts to get above a certain temp, it will begin to spin up.
For example, you can replace the existing M106 P2 command in config.g with the following command.
M106 P2 T35:55 H100:101:102 C"Case Fan"
This will set Fan2 as “Case Fan”. And will turn on when the MCU temperature (virtual heater 100) reaches 35C and reaches full speed when the MCU temperature reaches 50C or if any driver (virtual heaters 101 and 102) report that they are nearing over-temperature.
Changing the fan control is totally optional, and for the Ender 3 best performance is likely to be had by simply tying the case fan to turn on whenever the hotend or bed heat up, ie whenever a print is going.
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