Temp controlled Fan setup for non-heater application

lukas.aurarum

I am trying to setup a Chassis fan to suck out air from enclosure once the ambient enclosure temp exceeds say 65degC

I have this setup as i am using PT100 sensors

M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S160 ; Set temperature limit for heater 0 to 160C
M305 P1 X201 ; Configure PT100 for heater 1
M143 H1 S430 ; Set temperature limit for heater 1 to 430C
M305 P2 X200 ; Configure PT100 for heater 2
M143 H2 S430 ; Set temperature limit for heater 2 to 430C
M305 P3 T100000 B4138 R4700

Fan control something like this

M106 P2 S0 T65 H3

as using P2 Fan output.

I wish to use a normal thermister on say E0 thermistor input as its not used due to PT100 Board

I was playing with the M305 command to setup parameters for thermistor

Is there a simple way for the M106 commane to read the thermistor channel, do i need to create a tool?
What have i missed?

some help would be greatly appreciated.

lukas.aurarum

Any Help here. i can seem to read the onboard thermistors after i have the PT100 allocated to the Hot ends.

For the time being i have my chamber fan turning on after the Bed gets to 130 Deg C.

dc42

Use M305 to set up a virtual heater that uses that thermistor (e.g. heater 102), then use M106 to control the fan thermostatically from that heater number.