Simple question: I'd like to control the fan of my cnc brainz with a

Simple question:

I’d like to control the fan of my cnc brainz with a thermistor. Something like over valueA = on, under valueB = off (or a value with hysereris like bang-bang).
Is there a way to do that in smoothie ?
I want the function to be active all the time when the board is powered, not gcode activated like “temperature_control” or “switch”.
It can easily be done with an arduino trinket-like but if I can use those spare thermistor inputs…

-_- Just saw it on the wiki I think I’m blind… Thanks Peter

Smoothiebrainz thermistor pins are T1 0.23, T2 0.24 and T3 0.25 ?