Larkbox Fan - Which sensor/register to tell if on?

Hello Everyone,

Does anyone know which sensor or register can be read to determine if the Larkbox fan is on or off? I am monitoring the temperatures on my Larkbox and I would like to add a sensor for fan on/off. However, of the lists of sensor available in HWinfo does not list any for the fan.

PS. So far, my Larkbox has been performing very well and I have not had any issues. Thank you to my lucky stars.

Thanks for the help

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my gues, bcz fan go up with temperature above 54degree, if you have that temperature, the fan will be always on